Roger Federer of Switzerland celebrates after defeating Juan Martin del Potro of Argentina at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Friday, Aug. 3, 2012. (AP Photo/Elise Amendola)
Roger Federer of Switzerland returns to John Isner of the United States at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Thursday, Aug. 2, 2012. (AP Photo/Elise Amendola)
Roger Federer of Switzerland returns to John Isner of the United States at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Thursday, Aug. 2, 2012. (AP Photo/Elise Amendola)
Pimms, a popular English liqueur, is listed as "No. 1 Fruit Cup" on a drink menu at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012. Olympic branding regulations have restricted many familiar brand names from being shown in connection with the games. (AP Photo/Mark Humphrey)
Pimms, a popular English liqueur, is listed as "No. 1 Fruit Cup" on a drink menu at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012. Olympic branding regulations have restricted many familiar brand names from being shown in connection with the games. (AP Photo/Mark Humphrey)
Serena Williams of the United States celebrates her victory over Vera Zvonareva of Russia at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012. (AP Photo/Elise Amendola)
Serena Williams, left, and Venus Williams of the United States clasp hands as they compete against Sorana Cirstea and Simona Halep of Romania in women's doubles at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Monday, July 30, 2012. (AP Photo/Elise Amendola)
Serena Williams, left, and Venus Williams of the United States clasp hands as they compete against Sorana Cirstea and Simona Halep of Romania in women's doubles at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Monday, July 30, 2012. (AP Photo/Elise Amendola)
Novak Djokovic of Serbia celebrates his victory over Andy Roddick of the United States at the All England Lawn Tennis Club in Wimbledon, London, at the 2012 Summer Olympics, Tuesday, July 31, 2012. (AP Photo/Elise Amendola)
