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LONDON, ENGLAND - JULY 08: Roger Federer of Switzerland serves during the Men's Singles Semi Final match against Milos Raonic of Canada on day eleven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 8, 2016 in London, England. (Photo by Julian Finney/Getty Images)

LONDON, ENGLAND - JULY 08:  Roger Federer of Switzerland serves during the Men's Singles Semi Final match against Milos Raonic of Canada on day eleven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 8, 2016 in London, England.  (Photo by Julian Finney/Getty Images)