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LONDON, ENGLAND - JULY 12: Roger Federer of Switzerland runs to play a forehand in his Men's Singles semi-final match against Rafael Nadal of Spain during Day eleven of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 12, 2019 in London, England. (Photo by Matthias Hangst/Getty Images)

LONDON, ENGLAND - JULY 12: Roger Federer of Switzerland runs to play a forehand in his Men's Singles semi-final match against Rafael Nadal of Spain during Day eleven of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 12, 2019 in London, England. (Photo by Matthias Hangst/Getty Images)