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LONDON, ENGLAND - JULY 05: Kei Nishikori of Japan returns a shot against Bernard Tomic of Australia during their Men's Singles second round match on day four of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 5, 2018 in London, England. (Photo by Clive Mason/Getty Images)

LONDON, ENGLAND - JULY 05:  Kei Nishikori of Japan returns a shot against Bernard Tomic of Australia during their Men's Singles second round match on day four of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 5, 2018 in London, England.  (Photo by Clive Mason/Getty Images)