The ITF says it awarded the seedings based on the ATP and WTA rankings of July 23. Beijing Olympics bronze medallist Novak Djokovic is seeded No. 2 and local hope Andy Murray, who lost the Wimbledon final to Federer earlier this month, is No. 3. Rafael Nadal, the 2008 Olympic champion, withdrew from the London Games due to injury.
Wimbledon winner Serena Williams is seeded fourth in the women's draw, behind Australian Open champion Azarenka, Wimbledon runner-up Agnieska Radwanska and French Open champion Maria Sharapova.
Serena and Venus Williams, bidding for a third Olympic doubles title, were unseeded in the women's doubles.