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LONDON, ENGLAND - July 14: Novak Djokovic of Serbia in action against Roger Federer of Switzerland during the Men's Singles Final on Centre Court during the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 14, 2019 in London, England. (Photo by Tim Clayton/Corbis via Getty Images)

LONDON, ENGLAND - July 14:  Novak Djokovic of Serbia  in action against Roger Federer of Switzerland during the Men's Singles Final on Centre Court during the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 14, 2019 in London, England. (Photo by Tim Clayton/Corbis via Getty Images)