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LONDON, ENGLAND - JULY 12: Roger Federer of Switzerland plays a forehand during the Gentlemen's Singles quarter final match against Milos Raonic of Canada on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 12, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - JULY 12:  Roger Federer of Switzerland plays a forehand during the Gentlemen's Singles quarter final match against Milos Raonic of Canada on day nine of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 12, 2017 in London, England.  (Photo by Clive Brunskill/Getty Images)