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LONDON, ENGLAND - JULY 08: Kei Nishikori of Japan reacts in his Men's Singles fourth round match against Mikhail Kukushkin of Kazakhstan during Day Seven of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 08, 2019 in London, England. (Photo by Matthias Hangst/Getty Images)

LONDON, ENGLAND - JULY 08: Kei Nishikori of Japan reacts in his Men's Singles fourth round match against Mikhail Kukushkin of Kazakhstan during Day Seven of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 08, 2019 in London, England. (Photo by Matthias Hangst/Getty Images)