Federer says he struck gold in Sydney

Roger Federer might say he's already struck singles gold - he met now-wife Mirka at the 2000 Games in Sydney.

Twelve years on and Federer has been named top seed for the London Olympics as he strives to claim one of the only two major honours to elude the Swiss great.

The top-ranked Federer, bidding to complete the Wimbledon-Olympics golden double at the All England Club, has been named the Games' No.1 seed for the second time after also being top dog at Athens in 2004.

Novak Djokovic, the Beijing bronze medallist in 2008, is second seed, with Britain's Andy Murray - looking to atone for his Wimbledon final loss to Federer this month, is third seed in the absence of the injured defending champion Rafael Nadal.

World No.1 Victoria Azarenka is the women's top seed, with Australian Samantha Stosur the fifth seed.

The International Tennis Federation says it awarded the seedings based on the ATP and WTA rankings of July 23.

Wimbledon winner Serena Williams is seeded fourth in the women's draw, behind Australian Open champion Azarenka, Wimbledon runner-up Agnieszka Radwanska and and French Open titleholder Maria Sharapova.

Serena and Venus Williams, chasing a third Olympic doubles title, are unseeded in the women's doubles.

Although he has yet to win the singles gold, Federer has experienced three memorable Games already.

He teamed with Mirka in Sydney, carried the Swiss flag in Athens, won doubles gold with Stanislas Wawrinka in Bejing.

The 30-year-old was asked to be his country's flagbearer again this year, but graciously handed the honour to Wawrinka.

An Olympic singles gold and Davis Cup glory are the only major two feats in tennis the 17-times grand slam champion has yet to achieve.

"To win an Olympic gold, things all need to fall into place nicely," Federer said.