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LONDON, ENGLAND - JULY 10: Roger Federer of Switzerland acknowledges the crowd following victory in his Men's Singles Quarter Final match against Kei Nishikori of Japan during Day Nine of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 10, 2019 in London, England. (Photo by Mike Hewitt/Getty Images)

LONDON, ENGLAND - JULY 10: Roger Federer of Switzerland acknowledges the crowd following victory in his Men's Singles Quarter Final match against Kei Nishikori of Japan during Day Nine of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 10, 2019 in London, England. (Photo by Mike Hewitt/Getty Images)