Juan Martin del Potro, Roger Federer

Roger Federer, left, hugs Juan Martin del Potro. (Elise Amendola/Associated Press)

Roger Federer, left, hugs Juan Martin del Potro. (Elise Amendola/Associated Press)

at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Friday, Aug. 3, 2012. (AP Photo/Elise Amendola)