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LONDON, ENGLAND - JUNE 29: Kei Nishikori of Japan receives medical attention duding a practice session before the start of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on June 29, 2019 in London, England. (Photo by TPN/Getty Images)

LONDON, ENGLAND - JUNE 29: Kei Nishikori of Japan receives medical attention duding a practice session before the start of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on June 29, 2019 in London, England. (Photo by TPN/Getty Images)