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)
