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LONDON, ENGLAND - JULY 12: The covers come on during a rain break in the Final Of The Gentlemen's Singles between Novak Djokovic of Serbia and 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 Julian Finney/Getty Images)

LONDON, ENGLAND - JULY 12:  The covers come on during a rain break in the Final Of The Gentlemen's Singles  between Novak Djokovic of Serbia and 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 Julian Finney/Getty Images)