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LONDON, ENGLAND - JULY 12:  Novak Djokovic of Serbia plays a forehand in the Final Of The Gentlemen's Singles against Roger Federer of Switzerland on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 12, 2015 in London, England.  (Photo by Shaun Botterill/Getty Images)
LONDON, ENGLAND - JULY 12:  Novak Djokovic of Serbia plays a forehand in the Final Of The Gentlemen's Singles against Roger Federer of Switzerland on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 12, 2015 in London, England.  (Photo by Shaun Botterill/Getty Images)

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