Here's a quick round-up of today's action. Join us for more tomorrow when Usain Bolt and Yohan Blake get their 100m campaigns under way.
+ Britain's gold medal hopeful Jessica Ennis stole the show on the first day of track and field, setting personal bests in the 100m hurdles and 200m to take the overnight lead in the heptathlon.
+ Meanwhile Ethiopia's Tirunesh Dibaba defended her Olympic title in the women's 10,000m and Tomasz Majewski of Poland did the same in the shot put.
+ America ruled the pool as superstar Michael Phelps closed his Olympic individual career with gold in the 100m butterfly. Team-mate Missy Franklin won her third gold in a world record 200m backstroke and Katie Ledecky, 15, became the Games' youngest swim champion in the 800m.
+ In tennis, Wimbledon champion Roger Federer defeated Juan Martin del Potro in four hours and 26 minutes, to reach his first Olympic final. He will meet Britain's Andy Murray who beat world number two Novak Djokovic. Serena Williams will play Maria Sharapova in the women's final on Saturday.
+ In a good day for the hosts, rowers Anna Watkins and Katherine Grainger won the women's double sculls. And in the velodrome, Britain smashed the world record to win the men's team pursuit while Victoria Pendleton took the women's keirin.
2215 GMT: We'll be wrapping up the live report in a few moments. Leaving you as usual with our PHOTO OF THE DAY: Jessica Ennis in the 200m heats of the heptathlon in a day which saw her rise to the top of the standings and set a world heptathlon record in the hurdles.
Our TWEET OF THE DAY comes from New Zealand rower Mahe Drysdale @MaheDrysdale after winning the men's single sculls: "Sometimes dreams do come true. 12 years ago I left my job to follow a dream of Olympic Gold. Today I achieved it. #DontWakeMeUp."
2154 GMT: FOOTBALL: Great Britain's women's team are not bearing up so well... Midfielder Kelly Smith says: "They are heartbroken inside the changing room. That is the feeling of all of us. There is nothing more to say than that."
Canada's win set up a semi-final clash with reigning Olympic champions the United States at Manchester's Old Trafford on Monday when Japan will play France at Wembley.
2148 GMT: SWIMMING: Many kind words on Twitter for Britain's Rebecca Adlington after her disappointment in the 800m earlier. She tweets: "Wow the support is unbelievable and overwhelming!! Thank you thank you. So many emotions right now!"
2142 GMT: ATHLETICS: Tirunesh Dibaba's win in the 10,000m means she has matched her cousin Derartu Tulu in becoming the second woman to win two Olympic gold medals in the women's 10,000m. And it means that Kenya have still never won the event.
"I am very happy. I have never been happier like today," says a joyful Dibaba... "I have worked very hard for this. No one has ever done what I did today. I won two 10,000m gold medals (in London 2012 and Beijing 2008) and one 5,000m (in Beijing 2008).
2135 GMT: FOOTBALL: It's all over for Great Britain's women's football team, in their maiden Olympics. They lost 2-0 to Canada in the quarter final in Coventry today.
It was a disappointing result for the Brits who just days before beat Brazil in front of a 70,000-strong crowd -- a British record for a women's match -- at Wembley Stadium.
World champions Japan today ended Brazil's quest for the title with a 2-0 win in Cardiff.
2129 GMT: In the long jump, Panama's Irving Saladino, the former world champion, blames the weather conditions for his failure to qualify. He says: "Today I don't know but the wind was everywhere in the stadium. Sometimes it was on my back and then in the front."
But he's upbeat about the result: "I'm not disappointed. I was out for four months with surgery on my knee and only came back into training in April. I am fine and I am sure I will come back."
2124 GMT: "Ethiopian Tirunesh Dibaba successfully defended her women's Olympic 10,000m title in convincing style," reports AFP's Luke Phillips.
"Dibaba, a seven-time world champion and also Olympic champion and world record holder in the 5000m, clocked 30min 20.75sec.
"Kenya's Sally Kipyego claimed silver in 30:26.37, while teammate and reigning world champion Vivian Cheruiyot took bronze in 30:30.44."
2117 GMT: ETHIOPIAN TIRUNESH DIBABA DEFENDS WOMEN'S OLYMPIC 10,000M TITLE. Kenya's Sally Kipyego takes silver while her compatriot Vivian Cheruiyot wins bronze.
2107 GMT: Majewski's win makes him the first thrower in almost 60 years to retain the Olympic shot put title. He matched the feat of American Parry O'Brien, who won successive titles in 1952 and 1956.
2102 GMT: POLAND'S TOMASZ MAJEWSKI WINS MEN'S SHOT GOLD.
Majewski successfully defended his title to claim the first athletics gold medal of the Games with a season's best of 21.89 metres. Germany's David Storl took silver, with America's Reese Hoffa winning bronze.
The 30-year-old beat Germany's world champion David Storl, who had a best of 21.86 metres, while Reese Hoffa of the United States took bronze with 21.23 metres.
2058 GMT: Saladino isn't the only one to struggle in tonight's long jump and there seems to be some issue with the direction of the runway.
Germany's Sebastian Bayer did qualify for Saturday's final but only after registering a disappointing 3.96m on his third jump. He says: "It was very hard to jump today and I was lucky that I made qualification... I can't understand why we were jumping in this direction. The other direction would have been better."
2048 GMT: Disaster for Panama's defending long jump champion Irving Saladino! The 29-year-old has failed to qualify for the final with none of his three jumps registering a mark.
2043 GMT: ATHLETICS: "Jessica Ennis was glowing in the mixed zone after a fantastic opening day in the heptathlon," says AFP's John Weaver, from the stadium's media zone. "But she says she still has work to do to win a first Olympic gold."
Ennis told reporters: "It's a great way to end the first day... to get a personal best on day one is amazing...I know it sounds really cheesy but running round the bend, you really hear the crowd and it just lifts you."
2038 GMT: HOCKEY: Spain, silver medallists in Beijing have just posted their first win in three Pool A matches by prevailing 3-2 over South Africa.
Forced by injuries and suspension, Spain were a decimated side with just 15 players on the bench, including two goalkeepers. The victory brings Spain back into the tournament with four points from three outings.
2032 GMT: AFP's Luke Philips reports from inside the Olympic Stadium: "Incredible support for Ennis. Roars and applause as she clocks a new PB in the 200m to give her a convincing overnight lead on her rivals. What support!"
2023 GMT: That puts Ennis at the top of the standings after the first day of heptathlon events, with 4158 points. Earlier she set a heptathlon world record in the 100m hurdles of 12.54sec before nailing 1.86m in the high jump.
She had slipped to second place after the shot put -- one of her weaker events -- but the 200m pushed her back to pole position.
2018 GMT: ATHLETICS: Britain's Jessica Ennis storms through the 200m to finish in joint first place with Dutch rival Dafne Schippers. They cross the line at exactly the same time, which for Ennis is a personal best of 22.83 seconds.
2005 GMT: Poland's Adrian Zielinski won the 85kg weightlifting gold medal with a total lift of 385kg.
Russia's Apti Aukhadov lifted the same weight but took silver on bodyweight -- being the heavier contender -- while Iran's Kianoush Rostami lifted 380kg.
2000 GMT: POLAND'S ZIELINSKI WINS MEN'S WEIGHTLIFTING 85KG GOLD. Silver goes to Apti Aukhadov of Russia, bronze for Iran's Kianoush Rostami.
1957 GMT: ATHLETICS: More track and field events have kicked off at the Olympic stadium in the second session of the day and already American world champion Carmelita Jeter has fired a warning to Jamaica's sprint queens, qualifying quickest for the semi-finals of the women's 100m in a blistering time of 10.83sec.
It put her 0.10sec ahead of Nigeria's Blessing Okagbare, who set a personal best of 10.93sec to win her heat.
Jamaica's Veronica Campbell-Brown was third quickest in 10.94sec with her Jamaican team-mate and defending Olympic champion Shelly-Ann Fraser-Pryce, seventh fastest with 11.00sec.
1952 GMT: TENNIS: More details on that Murray-Djokovic match... Murray, who lost to Federer in the Wimbledon final last month, produced a masterful display to beat world number two Djokovic in two hours. The Scot is now guaranteed at least a silver medal as he heads into his first Olympic final on Sunday.
1947 GMT: Katie Ledecky, the 15-year-old who led all the way to beat Adlington in the 800m freestyle says: "I just wanted to see how I could do to represent the US and it's amazing"
A goodluck wish from superstar Phelps also helped her along she says: adding: "Michael is the first Olympian I ever met before I started swimming at the US Nationals in 2002 or 2003 in Maryland, so to get a good luck before the race really calmed me down and I was ready to swim my race," she says.
1942 GMT: SWIMMING: Rob Smith, who's been following the women's 50m freestyle semi-finals, reports: "Dutch flyer Ranomi Kromowidjojo has swum the year's fastest time of 24.07secs in cementing favouritism for Saturday's final.
"The Netherlands' newest swimming star was the fastest qualifier from the semi-finals into the final ahead of Aliaksandra Herasimenia of Belarus and teammate Marleen Veldhuis. Defending Olympic champion Britta Steffen of Germany was fourth quickest."
1936 GMT: HOCKEY: Some men's hockey field results also in now: (Group A) Australia 2-Argentina 2; Great Britain 4-Pakistan 1; (Groups B) South Africa 2-Spain 3; Netherlands 5-New Zealand 1; Germany 5-India 2.
1930 GMT: TENNIS: News coming in that Britain's Andy Murray is through to the final with Roger Federer.
A tweet from the official Team GB account says: "Once again Andy Murray's determination shines through as he wins a hardly fought game against Djokovic - 6-5 - Djokovic's serve."
1925 GMT: More details from Rob Smith on that 50m freestyle dash..."Frenchman Florent Manaudou has scored a shock win in the men's 50m freestyle helter-skelter.
"Manaudou hit the wall in 21.34secs ahead of American Cullen Jones (21.54) and Brazil's world record holder Cesar Cielo (21.59). In doing so he prevented the Americans from sweeping all four finals on the penultimate night of competition in the pool."
1920 GMT: Phelps up on the podium now smiling broadly -- and a little glassy eyed -- as he collects his 21st Olympic medal for the 100m butterfly -- his last ever individual race before retirement.
He said beforehand: "I thought it would hit me harder than what it is right now. A lot of those emotions haven't really come through my brain in the last week. Once I'm done, there's going to be a lot more emotion."
1915 GMT: FRANCE'S FLORENT MANAUDOU WINS MEN'S 50M FREESTYLE GOLD. American Cullen Jones wins silver, while Cielo Cesar of Brazil takes bronze.
1910 GMT: SOUTH KOREA WIN MEN'S TEAM SABRE FENCING GOLD. Silver goes to Romania and bronze to Italy.
1906 GMT: It is a massive disappointment for the home crowd, with Britain yet to win a gold medal in the pool at these Games. And even more of a disappointment for Adlington on whom their hopes were resting in her final Games.
Adlington, 23, tells the BBC the pressure and expectation surrounding the event had been "a bit of a battle" but she says: "I gave it my absolute all".
1901 GMT: Rob Smith reports: "Ledecky -- who is only 15 -- was under world record pace before hitting the wall in 8m14.63s in the second fastest time all-time with Spain's Mireia Belmonte Garcia (8:18.76) taking silver and Adlington (8:20.32) in bronze.
"The capacity crowd was chanting 'Becky, Becky', but Adlington was unable to keep in touch with the young tearaway American over the 16 laps."
1856 GMT: USA'S LEDECKY WINS WOMEN'S 800M FREESTYLE GOLD. Mireia Delmonte Garcia of Spain claims silver, Rebecca Adlington gets bronze.
1853 GMT: Adlington has been trailing USA's Katie Ledecky for much of the race and it's looking like the Britain is battling for silver now...
1848 GMT: The women are off next in the final of the 800m freestyle, with Britain's Rebecca Adlington, the fastest qualifier, hoping to defend her Beijing title...
1845 GMT: "Michael Phelps has won his third straight Olympic 100m butterfly gold to a huge roar at the Aquatics Centre," says Rob Smith.
"Phelps won his 17th Olympic gold medal and 21st medal overall in clocking 51.21secs. South Africa's Chad le Clos took the silver medal with Russia's Evgeny Korotyshkin getting the bronze."
1842 GMT: PHELPS WINS MEN'S 100M BUTTERFLY GOLD.
1838 GMT: "American teenager Missy Franklin has shattered the world record in winning the women's 200m backstroke gold medal," reports Rob Smith.
"World champion Franklin clocked 2:04.06 in the seventh world record of the meet to beat Russia's Anastasia Zueva 2:05:92) who won silver and fellow American Elizabeth Beisel (02:06:55) who took bronze."
Next up Phelps in his best discipline, the butterfly...
1836 GMT: USA'S FRANKLIN WINS WOMEN'S 200M BACKSTROKE GOLD IN WORLD RECORD.
1832 GMT: ATHLETICS: There's also another session of athletics tonight, on day one of the track and field events. Stay with us for the men's shot put and women's 10,000m finals as well as more heats, including the women's heptathlon 200m and shot put and men's 1500m.
1825 GMT: More on that swimming line-up from Rob: Rebecca Adlington carries Great Britain's hopes of their first gold medal in the pool when she defends her 800m freestyle title. The roof might blow off with this one?.
"There are two other finals tonight.. Brazilian world record holder Cesar Cielo is in lane four in the final of the men's 50m freestyle, while Americans Missy Franklin and Elizabeth Beisel are expected to fight out the women's 200m backstroke."
1820 GMT: That's it from the veldrome after a tearful podium spot from Pendleton. Meanwhile, in the aquatics centre, Rob Smith is gearing up for another thrilling night: "The second-last night of the swimming and the amazing Michael Phelps is going for his 21st Olympic medal in the men's 100m butterfly, an event in which he is the defending champion and world record holder," he says.
"He'll be up against South African Chad le Clos, who beat him for gold in the 200m butterfly here, and Serbia's Milorad Cavic, who was beaten by one-hundredth of a second by Phelps in this event at the 2008 Beijing Games."
1815 GMT: Instant chorus of support on Twitter for Pendleton, with Mayor London Boris Johnson adding his voice: "And so it continues with Victoria Pendleton in her pomp. Glorious!"
1810 GMT: "Pendleton wins convincingly!" says Justin Davis. "Her first Olympic keirin crown, and her last. She is retiring after the Games."
Guo Shuang of China took silver, with Lee Wai Sze of Hong Kong claiming bronze.
1805 GMT: BRITAIN'S PENDLETON WINS WOMEN'S KEIRIN GOLD.
1803 GMT: "God Save the Queen is ringing out, and the fans are joining in," says Justin Davis during the men's team pursuit medal ceremony. "Would bring a tear to a glass eye, and a few tears are being shed on the podium.
"Now for the women's keirin, the first time it is held at the Olympics. Will it be Pendleton, Meares or Guo? Pendleton has just looked too fast lately..."
1758 GMT: The men's pursuit team appear to be lost for words after their world record gold. Ed Clancy says simply: "I can't believe we won," while teammate Steven Burke says: "I just want to thank my teammates."
Perhaps it's just all been too much... Geraint Thomas, also on the team, adds: "The amount work we had to put in since November in Manchester was full-on. I was ill last week so it has been hard mentally."
1753 GMT: In less good news for cycling, Russian media are reporting that Viktoria Baranova, a member of the country's Olympic cycling squad, has confessed to doping.
Earlier today, the International Olympic Committee (IOC) informed Russian Games chiefs the sample which Baranova supplied for testing on July 24 contained the male hormone testosterone.
Baranova, who has been expelled from the women's pursuit cycling team and the Games, said she took one pill which contained the banned drug during a pre-Games training session and "knew it was forbidden".
1747 GMT: The British PM is among the first to congratulate the host team on Twitter: "Extraordinary to see the dominance of @TeamGB cycling -- smashing another world record and winning gold," the official Downing Street account @Number10gov tweets.
1742 GMT: Justin Davis adds: "Crowd in absolute frenzy as Great Britain win gold in a new world record time. Aussies second after losing Glenn O'Shea for the final few laps of the 16-lap event.
"It was the eighth world record in two days, and basketball star Kobe Bryant is here to see the action."
1537 GMT: The British team of Ed Clancy, Steven Burke, Peter Kennaugh and Geraint Thomas stormed to victory over Australia in a new world record time of 3:51.659 as crowds went wild at the velodrome.
Australia finished second in 3:54.581 to win silver while New Zealand won the bronze.
1531 GMT: GREAT BRITAIN WIN MEN'S TEAM PURSUIT GOLD in a new world record time.
1528 GMT: CYCLING: The men's team pursuit is under way at the velodrome. Justin Davis reports: "New Zealand men take the bronze in a thrilling battle with the Russians. NZL lost Marc Ryan with four laps to go but still came home in a great time of 3:55.
"Up next GB and Aussies for gold. Flags are flying and hands are clapping. It's time to 'Make some Noise', as the announcer keeps reminding us."
1725 GMT: TENNIS: Looks like it's going to be Serena Williams in that final against Sharapova. News just in that Williams has ousted Azarenka in the semis.
1720 GMT: In case you're just joining us, here's a recap of some of today's main events:
+ In the first day of track and field events, British golden girl Jessica Ennis clocked a heptathlon world record in the 100m hurdles in front of a packed stadium.
+ Roger Federer endured the longest three-set singles match in tennis' Open era when he beat Juan Martin del Potro in a four-and-a-half-hour contest, setting up a final clash with either Andy Murray or Novak Djokovic.
+ Maria Sharapova beat fellow Russian Maria Kirilenko 6-2, 6-3 to set up a gold medal match against either Serena Williams or Victoria Azarenka of Belarus.
+ The host nation added to Thursday's three-gold haul in early action with a victory for Anna Watkins and Katherine Grainger in the women's double sculls rowing.
1713 GMT: Victoria Pendleton wins her second round in the keirin, booking her place in the final and setting up a clash with Anna Meares.
Even England footballer Rio Ferdinand can't get enough of the cycling. He tweets: "The fellas + the chics on the bikes do ya thing....in you we trust! Love the cycling in the olympics!"
1700 GMT: "Looks like the British women want some gold of their own," says our Justin Davis. "GB women will race again Saturday in the first round. Next up is women's keirin second round then men's pursuit final, GB v Aus..."
1655 GMT: Yes! The British trio have done it. Dani King, Laura Trott and Jo Rowsell set a new world record of 3:15:669 in qualifying for the women's team pursuit, receiving a standing ovation from the crowds as they charged round the track.
1650 GMT: CYCLING: AFP's Justin Davis reports from the velodrome: "There's a handful of women's teams finishing around the 3:20 mark in qualifying for the first round of the three-woman, 3 km team pursuit, a new Olympic event.
"Let's see what the British women are made of. They are the world record holders in 3:15.720. A new world record?"
1645 GMT: Meanwhile Argentina's Juan Martin Del Potro seems gutted by his defeat to Roger Federer. He says: "It is tough to speak now, I feel sad, but Roger made a fantastic match, he is a good winner.
"When you lose you can't see the good things. I'm very sad at the moment. I just hope I will be better before my mixed doubles match."
1640 GMT: TENNIS: Maria Sharapova, now guaranteed at least a silver medal following her win over Maria Kirilenko in the semis, says: "It's incredible, not only to be part of this event and be an Olympian, but to put yourself in with an opportunity to go for gold. It's a really nice feeling.
"What I have achieved in my career has been amazing...I've been really fortunate to win all the Grand Slams and obviously this is my first Olympics so I'm just thrilled to be in the final."
1631 GMT: FOOTBALL: USA women's team are on course for a third straight Olympic football title after a 2-0 win over New Zealand.
Veteran USA striker Abby Wambach said the team are "bound for glory," adding: "It might not look pretty in every second of the game, but we get it done."
1623 GMT: KAZAKHSTAN'S PODOBEDOVA WINS WOMEN'S -75kg WEIGHTLIFTING GOLD.
Svetlana Podobedova, 26, managed a total lift of 291kg, defeating Russia's Natalya Zabolotnaya who also lifted 291kg.
Zabolotnaya took silver in line with rules which state that the lighter competitor wins in the case of a tie. Belarusian Iryna Kulesha won bronze with 269kg.
1617 GMT: DIVING: AFP's Rob Smith reports from the aquatics centre: "Another masterful performance by the Chinese divers with Wu Minxia and He Zi leading the top-18 qualifiers into Saturday's semi-final of the women's three-metre springboard.
"Wu nailed a masterful backward 2.5 somersault on her final dive to score 84.00 in her five-round total of 387.95 -- 24.10 ahead of He in Friday's prelims.
"He, who partnered Wu to win the synchro 3m springboard gold medal on Sunday, led Wu for the only time after the third round before finishing in second spot on 363.85.
"Italy's Tania Cagnotto (349.80), Canada's Jennifer Abel (344.15), Australian Sharleen Stratton (342.70) and Canada's Emilie Heymans (337.20) complete the top six into the semi."
1611 GMT: CYCLING: Things are apparently hotting up on the trackside... British cyclist Mark Cavendish tweets: "The temperature is increasing to "cooking" here in the Velodrome. If anybody is watching on BBC, I apologise for my shiny, sweaty head!"
While Britain and Australia will battle it out later for gold, the next two fastest in round one, New Zealand (3:56.44) and Russia (3:57.237) will fight for the bronze.
1600 GMT: TENNIS: Relief for Roger Federer!! He survives the epic against Juan Martin Del Potro to reach his first Olympic singles final with a record-breaking 3-6, 7-6 (7/5), 19-17 victory over the Argentinan.
The Swiss world number one was on the brink of a shock defeat after dropping the first set, but fought back to subdue del Potro in the longest three-set men's singles match in the Open Era. He will face either Novak Djokovic or Andy Murray in Sunday's final.
1556 GMT: More on that men's team pursuit from Justin Davis: "As expected, it's a GB v Aussie final in the men's team pursuit later Friday. Going on the latest performances, though, Australia (which clocked 3:54.317) will have to move up a gear, or come up with a strategy, if they are to beat the recent world record holders who came close to eclipsing their new mark of 3:52.499."
1551 GMT: "A surprise for the fans at the trackside with the appearance of Tour de France champion and new Olympic time trial champion Bradley Wiggins," Justin Davis noted ahead of that race.
"Looks rather dapper too in his trademark Mod gear and accompanying sideburns."
1546 GMT: CYCLING: The British team get a standing ovation as they storm through the first round of the men's team pursuit in 3:52:743 -- just below the world record time they set yesterday. They finish ahead of Denmark with a time of 3:57:396.
1540 GMT: SOUTH KOREA'S OH JIN-HYEK WINS MEN'S INDIVDUAL ARCHERY GOLD. Oh beat Japan's Takaharu Furukawa 7-1 in the final at Lord's Cricket Ground.
Bronze went to China's Dai Xiaoxiang, who beat European champion Rick van der Ven of the Netherlands.
1533 GMT: CYCLING: Justin Davis reports from the trackside: "Spain set a rather decent time of 3:59.520 for the men's team pursuit, prompting some flag waving from the few Spanish fans in the velodrome.
"But the big guns have still to fire. Great Britain clocked a world record of 3:52.499 on Thursday, and might go even faster as they bid to make the gold medal match."
1528 GMT: FRANCE'S RINER WINS MEN'S HEAVYWEIGHT JUDO GOLD. Silver goes to Alexander Mikhaylin, of Russia while bronzes go to Rafael Silva of Brazil and Germany's Andreas Toelzer.
Five-time world champion Teddy Riner finally landed the Olympic crown after beating three-time Russian world champion Mikhayline on penalties in front of crowds of French fans.
1523 GMT: BADMINTON: More on that men's final...China's top seeds Zhang Nan and Zhao Yunlei defeated compatriots Chen Xu and Ma Jin, the second seeds, 21-11, 21-17 to win the mixed doubles title.
Denmark's Joachim Fischer and Christinna Pedersen beat Tontowi Ahmad and Liliyana Natsir of Indonesia 21-12, 21-12 for the bronze.
1521 GMT: CYCLING: Victoria Pendleton came in ahead of Anna Meares in that first women's keirin heat, putting both riders through to the second round. Also going through are Guo Shuang of China, Germany's Kristina Vogel, and Simona Krupeckaite of Lithuania.
Next up... first round of the men's team pursuit and a potential second world record for the Brits.
1516 GMT: CUBA'S ORITZ WINS WOMEN'S JUDO HEAVYWEIGHT GOLD.
1514 GMT: CHINA'S ZHANG NAN, ZHAO YUNLEI WIN BADMINTON MIXED DOUBLES GOLD.
1509 GMT: CYCLING: AFP's Justin Davis is down at the velodrome for the first round of the women's keirin, where Victoria Pendleton is aiming for gold for the hosts. So, too, will be Australian rival triple-world champion Anna Meares and Chinese ace Guo Shuang.
The crowd give a roar of support at the start for Pendleton who yesterday was disqualified from the team sprint with teammate Jess Varnish when the pair's wheels overlapped on the changeover.
1504 GMT: CHINA'S DONG DONG WINS MEN'S TRAMPOLINE GOLD. Russia's Dmitry Ushakov takes silver and Lu Chenlong of China claims bronze.
Jim Slater sums up Dong's last routine: "Dong Dong has just turned in his routine and the crowd goes wild. He raises his hands like a winner but it's up to the judges. Five triple somersaults to start his routine, that's a stunner.
"He gets the reward, 62.990 points for gold, hugs his coach and waves to the crowd with a huge smile and takes a well deserved bow to a standing ovation.
1459 GMT: TENNIS: Russian world number Maria Sharapova clinches her place in the final with a 6-2, 6-3 victory over compatriot Maria Kirilenko in the semis.
The 25-year-old will play Wimbledon champion Serena Williams or world number one Victoria Azarenka in Saturday's final.
1454 GMT: GYMNASTICS: "Canada's Jason Burnett -- Michael Cera's stunt double in the movie "Scott Pilgrim vs The World" -- is known for his difficult routines but it bit him in the Olympic final," reports AFP's Jim Slater from the men's trampoline final.
"He caught the edge of the mat near the springs with his foot and fell onto the trampoline early. He scored only 6.715, about 54 points behind the leader now with four leaders yet to compete."
1449 GMT: TENNIS: Roger Federer still battling it out with Juan Martin del Potro for a place in the finals....
"Amazing - Delpo gets 0-40 and breaks straight back now locked at 10-10 final set," tweets the official Olympic Tennis account.
1435 GMT: SHOOTING: Leuris Pupo wins Cuba's first gold medal of the 2012 Olympics on Friday, claiming the men's 25m rapid fire pistol shooting gold.
India's Vijay Kumar bags silver while Feng Ding of China takes the bronze.
World champion Alexei Klimov of Russia finishesoff the podium despite having shot a perfect score of 600 in the qualifying round.
1430 GMT: GYMNASTICS: From the men's trampoline final, our reporter Jim Slater sends this:
"Aussie Gaudry Blake just landed on the edge of the mat, spotter mat keeping him from a nasty tumble.
"Now here comes reigning world and Olympic champion Lu Chunlong of China
"He gets 10 metres up quickly and makes astonishing flips -- 3 front forward somersaults with twists (triffs) -- and keeps himself in centre of the mat quite well. Great height, 61.235 score puts him 3rd after qualifying behind Dong Dong, a two-time world champion from China, but safely in the last eight that compete for a medal."
1424 GMT: Have claims of Nazi-like salutes by Lithuanian fans been entirely down to cultural misunderstanding? Lithuanian fans and media have attacked British officials who accused the Baltic state's basketball supporters of racism.
The reaction came after a London court imposed a 2,500 pound (3,181 euro, $3,885) fine on fan Petras Lescinskas, finding him guilty of making Nazi salutes and monkey chants after he was arrested at Tuesday's Lithuania-Nigeria basketball game.
"The gesture and chanting of this fan and all others was totally misunderstood and misinterpreted by the undercover police officers who made the arrest," a group of fans say in a statement. They condemn racism and say the extending of arms after clapping is a common gesture at sporting events and "is in no way meant to represent the Nazi salute."
"They said we were doing some monkey sounds. But when it's when a referee makes mistakes, then we chant fu-fu-fu," Lescinskas told Lithuanian news website delfi.lt.
1420 GMT: Events appear to have run smoothly on the first morning of track and field -- but not everyone thought so.
Krisztian Pars of Hungary finished first in the men's hammer throw qualification round B but later lashed out at organisers:
"I am absolutely dissatisfied with the organisation," he said. "There was a 30-minute delay at the beginning and then I had to wait another 30 minutes when I went out. This had a great impact on my performance."
1412 GMT: GYMNASTICS: Get ready for a bit of bounce: the men's trampoline final starts shortly.
US competitor Steve Glucksteain tweets: "If u havent seen trampoline be ready 2 be blown away!"
1411 GMT: ATHLETICS: Lamine Diack, president of the International Association of Athletics Federations (IAAF), was thrilled to see the Olympic Stadium packed with spectators for the first athletics session of the Games this morning.
He says: "It was wonderful to arrive at the Olympic Games this morning and see a totally packed stadium for the first session of athletics.
"I do not remember the last time this happened and it shows the great affection Britain has for our sport?The athletes will definitely be inspired by crowds like this."
Stay with us for more athletics later today...
1408 GMT: TENNIS: It's extremely tense as Federer and Del Potro battle it out in the Olympic semi-final third set.
"We're at 6-6 and no tiebreak. Who will blink first - Fed or Delpo?" tweets the Olympic tennis account.
1405 GMT: BADMINTON: The Olympic shuttlers are storming on despite the scandal in which eight female players were disqualified two days ago.
In the men's competition, defending champion Lin Dan of China is currently up against South Korea's Lee Hyun Il in the semi-final. Lin takes the opening game 21-12, with the Korean looking a little under par.
1400 GMT: JUDO: Big Ted -- that's French judo star Ted Riner, if you're new to the sport -- is about to come out for his heavyweight semi-final and the ExCel Arena is awash with tricolore flags.
"For a moment I thought we were in Paris. The roof will go off if he wins," reports AFP's Barnaby Chesterman.
There to watch him is another big French name, basketball's Tony Parker. "I'm at the judo to support Teddy!!!" Parker tweets.
1359 GMT: BASKETBALL: Australia's Liz Cambage has produced a rare slam dunk by a female basketball player in today's 70-66 win over Russia which helped take her team into the Olympic Games knockout round.
Cambage delivered her dramatic, high-flying score during a 12-0 run early in the third period that swung the balance in favour of the Opals.
"It's big, but a little part of the game. We've got so much more to focus on. My mom will be crying but I'm just happy we won," said Cambage of her slam dunk.
1341 GMT: ATHLETICS: With today's athletics taking a pause until 1800 GMT, British golden girl Jessica Ennis is on 2,249 points in the heptathlon after the first two events, with the shot put and 200m to come later in the day.
American Hyleas Fountain is second on 2,224pts, with another Briton, world junior long jump champion Katarina Johnson-Thompson, in third (2,146) after an impressive 1.89m in the high jump.
1337 GMT: US swimmer Rebecca Soni -- who yesterday broke the women's 200m breaststroke world record for the second time in two days -- has meanwhile had a satisfying lunch.
"Great lunch over at street foods part of village! Best part was Scotland cart- shortbread & smoked cheddar. Makes me want to visit Scotland!" she tweets.
1334 GMT: British swimmer Liam Tancock tweets: "Thanks for the Good Luck cards Ive received in the Village! Can't believe some arrived with just the address as Liam Tancock Olympic Village."
1332 GMT: WEIGHLIFTING: More on groundbreaking female athletes, who seem to be a theme today. Thuraia Sobh, Syria's first female Olympic weightlifter, set a personal best in the women's 75kg at the ExCeL centre.
She says: "I enjoyed the game today and I think it went well. I feel proud that I am the first Syrian female weightlifter. I came here to break records and I did break my personal record as I lifted 201kg."
1321 GMT: TENNIS: Roger Federer is embroiled in an epic encounter with Juan Martin del Potro in the Olympic semi-finals, reports AFP'S Steven Griffiths from Wimbledon.
The Swiss great has been pushed to the brink by the Argentine, but he has drawn level at 3-6, 7-6 (7/5) after winning a tense tie-break on Centre Court.
Del Potro has just taken the first game of what promises to be a dramatic deciding set.
1318 GMT: JUDO: The home of judo, Japan, is having a disappointing Games. No Japanese man will win a gold medal in judo for the first time ever after Daiki Kamikawa lost in the heavyweight division.
Kamikawa's second round defeat by Ihar Makaru of Belarus also condemned Japan to their worst Olympic performance in the sport since 1988 in Seoul -- the last time they failed to top the judo medals table.
Men's coach Shinichi Shinohara, a silver medallist in Sydney 12 years ago, said the team are not mentally strong enough.
"It is my responsibility. Technically we were good but mentally and in terms of power we were weak," he said.
1314 GMT: SWIMMING: A touching conversation on Twitter between 15-year-old Lithuanian swimmer Ruta Meilutyte, who won the 100m breaststroke, and 18-year-old British diver Tom Daley, who failed to medal in the synchronised diving but still has competitions to go.
The pair are schoolmates at Plymouth College in southern England.
"Good luck Tom!! Hope you do amazing!!" tweets Meilutyte.
"Thanks :) you have done amazing!!! See you back at school in sept :P" replies Daley. "You need to change your (Twitter) bio to Olympic Champion too!!!"
1309 GMT: It's a good day for women from nations that don't often send female athletes to the Olympics.
Teenage 400m runner Maziah Mahusin has spoken of her pride at becoming the first woman from Brunei to represent her country at an Olympic Games after racing to a new national record in London.
Mahusin was the last to finish in heat six of the women's 400m, more than eight seconds behind the winner. But the smiling 19-year-old, who said she was nervous in front of the packed and vocal crowd of 80,000 in the Olympic Stadium, said she was thrilled to run a personal best and new national record of 59.28sec.
1305 GMT: South African sprinter Oscar Pistorius is clearly making the Olympics a family affair ? this from his Twitter account:
"To a few of the many people who have supported me the past 5yrs who will be there tomorrow. My bro,sister,89yr old gran,coach,fam. Thk you!"
1300 GMT: In the men's shot put, we have Germany's David Storl leading Group A. followed by Poland's Tomasz Majewski, with distances of 21.15m and 21.03m respectively. Group B is headed by the US's Reese Hoffa at 21.36m followed by compatriot Ryan Whiting at 20.78m.
1255 GMT: Ennis tells the BBC that the morning "blew me away to be honest -- the crowd and how much they got behind me was amazing."
On her astonishing hurdles run, she says: "I knew it was a fast track and really good conditions... but I still can't believe I ran that time."
1250 GMT: ATHLETICS: After her stunning result in the hurdles, British heptathlete Jessica Ennis gets to 1.86 in the high jump -- a lifetime best but she won't top the tables from this one.
Austra Skujyte of Lithuania clears 1.92m.
1225 GMT: A quick recap of main Olympic news so far today:
+ Athletics events began in a packed Olympic stadium, with British title hope Jessica Ennis, a poster girl for the London Olympics, clocking the fastest ever time -- 12.54sec -- for a heptathlete in the 100m hurdles
+ Judoka Wojdan Shaherkani became the first ever female Saudi athlete to compete at the Olympic Games, but her historic debut lasted just 82 seconds
+ New Zealand bagged two rowing golds, with Mahe Drysdale winning the men's single sculls and Eric Murray and Hamish Bond claiming gold in the men's pair
+ Germany led from start to finish to win gold in the men's quadruple sculls, while Great Britain's Anna Watkins and Katherine Grainger held off Australia to claim gold in the women's double sculls
+ Sergei Martynov of Belarus clinched gold in the men's shooting 50m rifle prone
+ In badminton, China gained the certainty of at least two badminton gold medals as Wang Yihuan, the top-seeded world number one, reached the final of the women's singles.
1215 GMT: TENNIS: Roger Federer is in a spot of bother in his Olympic semi-final against Argentina's Juan Martin del Potro on Wimbledon's Centre Court, reports AFP's Steven Griffiths.
The seven-time Wimbledon champion, famously beaten by del Potro in the 2009 US Open final, has lost the first set 6-3. He leads 2-1 in the second, but the big-hitting del Potro looks in ominously good form.
1210 GMT: BADMINTON: Despite the scandal which resulted in four pairs of players -- two Chinese -- being disqualified, China is now sure of at least two badminton gold medals as Wang Yihuan, the top-seeded world number one, reached the final of the women's singles.
Wang did that with a 21-13, 21-15 win over Saina Nehwal, the fourth-seeded Commonwealth champion who was the first Indian badminton player ever to have reached the semi-finals of any Olympic event.
1200 GMT: ATHLETICS: From the packed Olympic Stadium, AFP's Luke Phillips that the crowd is further energised by the classic British pop hits playing over the sound system.
"Classic Britpop, now the Beatles' 'Love Me Do', into the Eurythmics... 'Sweet Dreams' as Jessica Ennis clears 1.80m," Luke reports.
In the high jump, British heptathlete Ennis -- who earlier clocked the fastest ever time for a heptathlete in the 100m hurdles in 12.54sec -- flew over the 1.83m mark at the first try, having been briefly held up at 1.80m.
1155 GMT: The parents of Olympic medallists have become regular television hits here in Britain, after South African swimmer Chad le Clos's father Bert gave an emotional interview to the BBC after watching his son win the 200m butterfly.
He was overcome with pride and kept exclaiming "Just look at him! My beautiful boy!"
Another equally upbeat interview with the parents of rowing bronze medallist Alan Campbell just now is leading British tweeters to call for a "mum and dad cam".
1153 GMT: SHOOTING: More on that rifle victory for Belarus -- Sergei Martynov clinched gold in the men's shooting 50m rifle prone after scoring an Olympic record maximum 600 points en route to the final.
The 44-year-old veteran, competing in his sixth Olympic Games after making his first appearance way back in 1988, secured the first gold medal of his long career ahead of Germany's Lionel Cox and Rajmond Debevec of Slovenia.
1150 GMT: The winning rowers are taking to the podium now in sunny Eton Dorney.
A clearly exhausted Alan Campbell , bronze medallist in the men's single sculls, tells the BBC, "I trained for ten years... It's taken me three Olympics. The crowd have been exceptional."
They broadcast footage of his mother cheering wildly as he crossed the finish line.
1148 GMT: More on New Zealand's rowing win: Mahe Drysdale claimed Olympic rowing gold in the men's single sculls for New Zealand's second title of the day.
Drysdale, who was ill when picking up bronze at the Beijing Games four years ago, was followed across the line by Ondrej Synek of the Czech Republic, with Great Britain's Alan Campbell taking bronze.
The Kiwis also won the men's pair earlier on the water at Eton Dorney courtesy of Eric Murray and Hamish Bond.
1143 GMT: NEW ZEALAND ROWER NAHE DRYSDALE WINS MEN'S SINGLE SCULLS GOLD
1138 GMT: MARTYNOV WINS GOLD IN 50M PRONE RIFLE SHOOTING
1133 GMT: CYCLING: After Great Britain's Philip Hindes admitted deliberately crashing to secure a restart in the men's team sprint cycling yesterday -- in which Britain eventually took gold -- the International Olympic Committee has said they have no plans to take further action.
"At present no, there are no plans," spokesman Mark Adams told reporters.
"Our view is purely that people were not deprived of a contest yesterday, and at the moment I have spoken to the UCI, the cycling federation, they are obviously aware of the situation, and at this stage they don't see any reason to question the result. At this stage neither do we."
1130 GMT: SWIMMING: After Britain's qualification for the men's 4x100 medley final as the second fastest team behind the Americans, backstroker Liam Tancock says: "This team now, it's great. It's a young team.
"There might be a few changes for the final, but we have won our heat. We were seeded 14th so we should be nowhere near the final but we have given ourselves the best possible shot."
1125 GMT: TENNIS: Roger Federer and Juan Martin del Potro are out on the court at Wimbledon for the first men's semi-final, says the official Olympic tennis Twitter feed.
"Short rain delay but roof open and sun shining!" it adds.
1121 GMT: ROWING: "I had to ask Katherine if it was a dream," British rower Anna Watkins tells the BBC of partner Katherine Granger after their women's double sculls gold.
British cyclist Chris Hoy tweets: "So happy for Kath and @watkinsteamgb (Anna Watkins) , absolutely fantastic! After 3 silvers it's finally gold for Kath, couldn't be happier for them!"
The pair beat Australia, while Poland, well behind the front two boats, took bronze.
In that men's pairs race, won by New Zealand, France narrowly prevailed in a scramble for silver with Great Britain, who took bronze.
1119 GMT: BRITAIN'S WATKINS, GRANGER WIN WOMEN'S DOUBLE SCULLS GOLD
1114 GMT: NEW ZEALAND'S MURRAY, BOND WIN MEN'S PAIR ROWING GOLD
1112 GMT: JUDO: More from judoka Wojdan Shaherkani, the first Saudi Arabian woman to compete at the Olympics, who sobbed as she admitted to being overwhelmed by her brief historic debut, in which she was beaten by Melissa Mojica of Puerto Rico.
The 16-year-old, who competed in the under-78kg category, broke down in tears as she embraced her father, himself a judo referee.
"I'm proud, I'm happy and I want to continue in judo. I want to thank the fans for their support," she said.
"I was disturbed and afraid at the beginning, it was my first time in a big competition and there was a lot of pressure because of the hijab issue. I was not comfortable because I didn't have any experience of big events. It took its toll on me."
Shaherkani was not allowed to wear the traditional Muslim headscarf for safety reasons, but extensive negotiations allowed her to wear a modified head covering.
1106 GMT: SWIMMING: Australia's Melanie Schlanger tweets after their top-qualifying 4x100m medley heat: "Woo! Great swim by the girls to qualify fastest for the Medley relay final. Lane 4. Cant wait to anchor the team home again!"
1105 GMT: ROWING: More on Germany's quadruple sculls victory. The winners -- comprising Karl Schulze, Philipp Wende, Lauritz Schoof and Tim Grohmann -- led from start to finish.
Croatia, champions in Beijing in 2008 and favourites after posting the fastest time in the semi-finals, took silver, a boat length adrift, with Australia filling the bronze medal position.
1100 GMT: The roof has nearly lifted off the Aquatics Centre with Great Britain beating Australia home in the heats of the men's 4x100m medley relay.
The Brits held on amid the deafening din to win in 3m33.44secs ahead of the Aussies in 3:33.73 with the Netherlands third ahead of the second heat.
The Australian women are the fastest qualifiers into the 4x100m medley relay final with a qualifying time of 3m55.42secs from Japan, Denmark and an under-strength America.
1052 GMT: SWIMMING: World champion and world record holder Sun Yang has put down the marker with the fastest heat time in the men's 1500m freestyle, reports AFP's Robert Smith from the stadium.
Sun, who became the first Chinese man to win an Olympic gold in the 400m freestyle earlier in the meet, clocked a controlled 14min43.25secs to go into Saturday's final as the man to beat.
Tunisia's Olympic champion Oussama Mellouli was second fastest in Sun's heat in 14:46.23 ahead of Canada's Ryan Cochrane.
1050 GMT: British triple jump world record holder Jonathan Edwards -- now retired -- tweets: "Can't do justice to how electric the atmosphere is in Olympic stadium."
1040 GMT: ROWING: Over on the river, Germany take the gold in the men's quadruple sculls final. Croatia take the silver, Australia the bronze.
1035 GMT: JUDO: AFP's Barnaby Chesterman reports from the tatami: "No sooner has Wojdan Shaherkani made Saudi Olympic history (as her country's first female Olympian) but her father is now refereeing a fight involving judo superstar Teddy Riner. Great day for the Shaherkani family!"
1030 GMT: Welsh hurdler Dai Greene wins his 400m hurdles heat in 48.98secs. The crowd are ecstatic.
1015 GMT: ATHLETICS: Ex-British hurdling medallist Colin Jackson tweets: "I'm still in shock with Jessica's speedy time. #wowjess."
1014 GMT: JUDO: Saudi judoka Wojdan Shaherkani speaks to AFP after her historic Olympic debut, the first for a Saudi woman.
"I'm glad and honoured to participate in the Olympic Games and I will continue to practice this sport," she tells our reporter.
Saudi's second female competitor will be American-raised 800m runner Sarah Attar who grew up mostly in California.
1007 GMT: Afghan athlete Tahmina Kohistani came last in her 100m heat but still scored a personal best of 14.42 -- though several seconds behind heat winner Toea Wisil of Papua New Guinea with 11.60.
1000 GMT: SWIMMING: Newly-crowned Dutch Olympic 100m frestyle champion Ranomi Kromowidjojo has picked up where she left off last night by swimming the fastest qualifying time in the women's 50m freestyle heats, reports AFP's Robert Smith at the aquatic stadium.
Kromowidjojo clocked 24.51secs to finish in a one-two with teammate Marleen Veldhuis (24.57) ahead of British hope Francesca Halsall (24.61).
Defending Olympic champion Britta Steffen of Germany was fourth fastest into Friday night's semis ahead of Sweden's Therese Alshammar in sixth spot.
0955 GMT: ATHLETICS: Jessica Ennis' time in that 100m hurdles head, 12.54sec, equals the time in which the US' Dawn Harper won the women's 100m hurdles gold at the Beijing Olympics four years ago. A huge feat for a heptathlete.
0947 GMT: JUDO: Wojdan Shaherkani has become the first ever female Saudi athlete to compete at the Olympic Games -- but her historic debut lasted just 82 seconds.
Looking nervous and wearing a swimming cap-style head covering, she was beaten by Melissa Mojica of Puerto Rico in the first round of the women's under-78kg category.
0941 GMT: Ennis clocked the fastest ever time for a heptathlete in the 100m hurdles -- a scorching personal best of 12.54sec in brilliant sunshine.
It was the perfect start in the gruelling seven-discipline event for Ennis, with the high jump, shot put and 200m to come later in the day.
The heptathlon concludes on Saturday after the long jump, javelin and 800m.
0939 GMT: ATHLETICS: British heptathlete Jessica Ennis takes her 100m hurdles heat in an amazing 12:54 to lead with 1195 points.
A deafening roar from the crowd!
0930 GMT: JUDO: AFP's Francoise Chaptal reports that Saudi judoka Wojdan Shaherkani arrives on the tatami, her head covered with a kind of cap.
As the first ever Saudi female athlete, Shaherkani is a trailblazer.
But Sue Tibballs of the Women's Sport and Fitness Foundation writes in the New Statesman magazine that Shaherkani "is coached by her father in private and, with just a blue belt to her name, is woefully, and perhaps dangerously, under-qualified to compete at an international level".
Many are hoping Shaherkani's step forward may spark more opportunities for her, and other Saudi women, to train and compete.
0915 GMT: Ukraine's Natalia Dobrynska, who won the 2012 world indoor pentathlon title, is in the second heat of the 100m hurdles and looks reasonably happy with her time of 13.57.
The stadium looks almost full and the atmosphere electric -- huge applause and cheers from the crowd even in these early heats. A massive roar for British hepathlete Louise Hazel.
British pole vaulter Holly Bleasdale tweets: "Wowwww the stadium is rammed and it's this early! :) buzzing!!!! So excited! Let's go GB lets go!!"
0905 GMT: ATHLETICS: The starting gun has fired at the Olympic stadium! Athletic events start with women's heptathlon 100m hurdles heats.
Poland's Karolina Tyminska takes the starting heat in 13.22.
0855 GMT: Rather less excitement on London's creaky transport network, where signal failures have been causing severe delays on a key London Underground line to the Olympic Park.
The Central Line was partly suspended in east London -- home to the Olympic Stadium -- for more than an hour at the height of the morning rush hour, and severe delays continued.
Not the best news on what's expected to be the busiest day of the Games. But official body Transport for London said the suspension had been lifted and they are "able to get spectators to the Olympic Park in good time for today's events".
0850 GMT: ATHLETICS: Olympic gold medal-winning US decathlete Bryan Clay tweets: "Woohoo!!!! Track kicks off today in #london2012. Can't wait to cheer on the RED, WHITE, and BLUE!!!! #GoTeamUSA."
"I've never seen so many people show up for a heptathlon, stadium is more than 3/4 full and they are still coming!!!! #teammultievents"
0845 GMT: CYCLING: Happiness on Twitter from the wife of British cyclist Chris Hoy, who claimed a record-equalling fifth career gold in the men's team sprint last night.
"I have woken up to find that a dream I had never even dared to dream has come true. I am married to my very own superhero," Sarra Kemp tweets. Aahhhh!
Her husband is a bit more understated. He tweets: "Just updated my twitter bio ;-) ." It now reads: "5 x Olympic Champ track cyclist."
0830 GMT: ATHLETICS: Afghanistan's only female Olympic athlete, Tahmina Kohistani, makes her entrance in the 100m heats from 0940 GMT.
When it comes to overcoming obstacles to compete, Kohistani -- faced with not just the Afghan war but outright opposition from conservative Muslims -- is up there.
"This means a lot for me and my country. There were a lot of people who were trying to disturb me, to stop me from training, but I am here," she told us shortly before the Games. "Being a Muslim female athlete is most important for me."
0815 GMT: Remember the mystery woman who gatecrashed India's athletes' procession at the opening ceremony, to the fury of Indian organisers? She's broken cover to apologise for her "error of judgement".
Madhura Nagendra, 27, who was a volunteer taking part in the opening ceremony, told India's NTV news that she had become overexcited and spontaneously joined in, and didn't realise the scale of the public reaction until she went back home to Bangalore.
"As an error of judgement, I landed up walking with the athletes," she said. "I'm a proud woman of India and I was taken aback seeing all the comments. I hope this will be forgiven."
0807 GMT: Some key events to look out for today:
+ Track and field gets underway with medals in women's 10,000m -- a potential duel between Kenya's Vivian Cheruiyot and Ethiopia's Tirunesh Dibaba -- and men's shot, while British athletics' golden girl Jessica Ennis makes her entrance inthe opening rounds of the heptathlon (from 0900 GMT)
+ Michael Phelps looks for his 21st Olympic medal in the men's 100m butterfly, while swimmers also go for gold in the women's 200m backstroke and 800m final and men's 50m freestyle (from 1830 GMT)
+ Tennis semi-finals at Wimbledon with Roger Federer, Novak Djokovic, Maria Sharapova and Serena Williams all in action (from 1100 GMT)
+ The first ever Saudi female Olympian, Wojdan Shaherkani, takes to the judo tatami for her first bout, wearing a headscarf after prolonged negotiations (0930 GMT)
WELCOME TO AFP'S LIVE REPORT on the London Olympics on Friday, August 3.
Track and field events begin today -- for many, the essence of the Olympics. There are more swimming finals, with Michael Phelps -- would it be a real Olympic day without Michael Phelps? -- in the 100m butterfly, and 22 medals up for grabs.
Stand by for a fuller run-down of today's events...
Britain's Jessica Ennis (L) and Britain's Katarina Johnson-Thompson (R) compete in the women's heptathlon 200m heats at the athletics event during the London 2012 Olympic Games on August 3, 2012 in London.
Athletes run past the Olympic Flame as they compete in the women's 10,000m final at the athletics event during the London 2012 Olympic Games on August 3, 2012 in London.
US swimmer Michael Phelps celebrates after winning the men's 100m butterfly final during the swimming event at the London 2012 Olympic Games at the Olympic Park on August 3, in London.
US swimmer Missy Franklin competes in the women's 200m backstroke final during the swimming event at the London 2012 Olympic Games on August 3, 2012 in London.
Great Britain's Edward Clancy, Geraint Thomas, Steven Burke and Peter Kennaugh compete during the London 2012 Olympic Games men's team pursuit track cycling event at the Veldorome in the Olympic Park in East London on August 3, 2012.
Argentina's Juan Martin del Potro congratulates Switzerland's Roger Federer after losing in the men's singles semifinal round match at the 2012 London Olympic Games at the All England Tennis Club in Wimbledon, southwest London, on August 3.
Great Britain's gold medalist Bradley Wiggins attends the London 2012 Olympic Games women's team pursuit track cycling event at the Veldorome in the Olympic Park in East London on August 3, 2012.
Britain's Katarina Johnson-Thompson competes in the women's heptathlon high jump at the athletics event during the London 2012 Olympic Games on August 3, 2012. World junior long jump champion Johnson-Thompson, was third in the standings with 2,146 after an impressive 1.89m in the high jump.