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LONDON, ENGLAND - JULY 09: Kei Nishikori of Japan celebrates winning his Men's Singles fourth round match against Ernests Gulbis of Latvia on day seven of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 9, 2018 in London, England. (Photo by Matthew Stockman/Getty Images)

LONDON, ENGLAND - JULY 09:  Kei Nishikori of Japan celebrates winning his Men's Singles fourth round match against Ernests Gulbis of Latvia on day seven of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 9, 2018 in London, England.  (Photo by Matthew Stockman/Getty Images)