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LONDON, ENGLAND - JULY 08: Kei Nishikori of Japan serves against Mikhail Kukushkin of Kazakhstan during Day 7 of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 08, 2019 in London, England. (Photo by TPN/Getty Images)

LONDON, ENGLAND - JULY 08:  Kei Nishikori of Japan serves against Mikhail Kukushkin of Kazakhstan during Day 7 of The Championships - Wimbledon 2019 at All England Lawn Tennis and Croquet Club on July 08, 2019 in London, England. (Photo by TPN/Getty Images)