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LONDON, ENGLAND - JULY 12: Roger Federer of Switzerland and Novak Djokovic of Serbia ahead of the Final Of The Gentlemen's Singles 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 Clive Brunskill/Getty Images)

LONDON, ENGLAND - JULY 12:  Roger Federer of Switzerland and Novak Djokovic of Serbia ahead of the Final Of The Gentlemen's Singles 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 Clive Brunskill/Getty Images)