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LONDON, ENGLAND - AUGUST 05: Left to right, bronze medallist Juan Martin del Potro of Argentina, gold medallist Andy Murray of Great Britan and silver medalist Roger Federer of Switzerland celebrate during the medal ceremony for the Men's Singles Tennis 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 Professional Sport/Popperfoto via Getty Images/Getty Images)

LONDON, ENGLAND - AUGUST 05: Left to right, bronze medallist Juan Martin del Potro of Argentina, gold medallist Andy Murray of Great Britan and silver medalist Roger Federer of Switzerland celebrate during the medal ceremony for the Men's Singles Tennis 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 Professional Sport/Popperfoto via Getty Images/Getty Images)