Kiwi pair Jo Aleh and Olivia Powrie are in gold medal position after back to back wins on day four of racing in the women's 470 at the Olympic regatta in Weymouth.
Starting the day a point behind the British combination of Hannah Mills and Saskia Clark, Aleh and Powrie moved from fourth at the start of the opening race on Tuesday to take the lead by the third mark and were never headed.
That gave them the overall lead after the British boat was fifth and in the second race of the day they repeated the dose, this time leading from start to finish, to open up a four point advantage over the Brits.
There are two more races on Wednesday before the medal race on Friday.
The men's 470 duo of Paul Snow-Hansen and Jason Saunders out of the running for gold and silver medals but have an outside chance of bronze after the final day of fleet racing.
A 12th and 13th did not help their hopes and they will need a poor performance from Argentina to take third.
Australia lead the regatta with Britain four points behind - no other crew can catch them
Earlier Windsurfer JP Tobin could not defend New Zealand's Olympic title in the sport finishing seventh after the medal race.
Tobin, who won selection ahead of Beijing gold medallist Tom Ashley, was eighth in the final race to preserve his position on the leaderboard.
Dutchman Dorian van Rijsselberge will go into the history books as the last winner of the event at the Olympics. In Rio it will be replaced by kitesurfing.
Van Rijsselberge dominated the event, winning the medal race, to complete a regatta where his worst counting finish was a third.
Briton Nick Dempsey won silver, and bronze went to Poland's Przemyslaw Miarczynski.