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 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)