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LONDON, ENGLAND - JULY 06: Roger Federer of Switzerland plays a forehand during the Men's Singles Quarter Finals match against Marin Cilic of Croatia on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2016 in London, England. (Photo by Adam Pretty/Getty Images)

LONDON, ENGLAND - JULY 06:  Roger Federer of Switzerland plays a forehand during the Men's Singles Quarter Finals match against Marin Cilic of Croatia on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 6, 2016 in London, England.  (Photo by Adam Pretty/Getty Images)