Novak Djokovic of Serbia scrambles back to his racket after falling while playing against Juan Martin del Potro of Argentina in the men's singles bronze medal match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Mark Humphrey)
Novak Djokovic of Serbia scrambles back to his racket after falling while playing against Juan Martin del Potro of Argentina in the men's singles bronze medal match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Mark Humphrey)