LONDON, ENGLAND - JULY 12:  Novak Djokovic of Serbia retires injured during his match against Tomas Berdych of the Czech Republic in the Mens' Singles Quarter Final match on Court One during the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club at Wimbledon on July 12, 2017 in London, England. (Photo by Tim Clayton/Corbis via Getty Images)
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