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LONDON, ENGLAND - AUGUST 05: Juan Martin Del Potro of Argentina plays a forehand against Novak Djokovic of Serbia in the Men's Singles Tennis Bronze Medal Match on Day 9 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club on August 5, 2012 in London, England. (Photo by Julian Finney/Getty Images)

LONDON, ENGLAND - AUGUST 05:  Juan Martin Del Potro of Argentina plays a forehand against Novak Djokovic of Serbia in the Men's Singles Tennis Bronze Medal Match on Day 9 of the London 2012 Olympic Games at the All England Lawn Tennis and Croquet Club on August 5, 2012 in London, England.  (Photo by Julian Finney/Getty Images)