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LONDON, ENGLAND - JULY 02: Kei Nishikori of Japan plays a forehand during the Men's Singles third round match against Alexander Kudryavtsev of Russia on day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 2, 2016 in London, England. (Photo by Shaun Botterill/Getty Images)

LONDON, ENGLAND - JULY 02:  Kei Nishikori of Japan plays a forehand during the Men's Singles third round match against Alexander Kudryavtsev of Russia on day six of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 2, 2016 in London, England.  (Photo by Shaun Botterill/Getty Images)