Hewitt-Stosur doubles match postponed

Lleyton Hewitt and Samantha Stosur were scheduling victims of Roger Federer's remarkable semi-final in the Olympic tennis at Wimbledon.

The Australian mixed doubles pair had their quarter-final clash with Great Britain's Andy Murray and Laura Robson postponed from Friday until Saturday.

The shift was caused by an extraordinary men's singles semi-final on Centre Court, with world No.1 Federer taking four hours and 26 minutes to beat Argentine Juan Martin Del Potro 3-6 7-6 (7-5) 19-17, the longest best-of-three set match in the Open era.

That in turn delayed Murray's singles semi-final against Novak Djokovic, which did not begin until early evening.

The Federer-Del Potro match wasn't the only marathon match, with French combination Jo-Wilfried Tsonga and Michael Llodra needing three and a half hours to beat Spain's David Ferrer and Feliciano Lopez 6-3 4-6 18-16.

It is likely the winner of the Australia v Great Britain mixed doubles match will also have to play their semi-final against German pair Sabine Lisicki and Christopher Kas on Saturday, with the tournament due to end on Sunday with the mixed doubles final.