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LONDON, ENGLAND - JULY 12: Novak Djokovic of Serbia is consoled by Tomas Berdych of The Czech Republic as he retires injured during the Gentlemen's Singles quarter final match 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 Julian Finney/Getty Images)

LONDON, ENGLAND - JULY 12:  Novak Djokovic of Serbia is consoled by Tomas Berdych of The Czech Republic as he retires injured during the Gentlemen's Singles quarter final match 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 Julian Finney/Getty Images)