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CHOFU, JAPAN - OCTOBER 07: Kei Nishikori of Japan plays a in action on in the Singles finals round against Daniil Medvedev of Russia on day seven of the Rakuten Open at Musashino Forest Sports Plaza on October 7, 2018 in Chofu, Tokyo, Japan. (Photo by Koji Watanabe/Getty Images)

CHOFU, JAPAN - OCTOBER 07: Kei Nishikori of Japan plays a in action on in the Singles finals round against Daniil Medvedev of Russia on day seven of the Rakuten Open at Musashino Forest Sports Plaza on October 7, 2018 in Chofu, Tokyo, Japan. (Photo by Koji Watanabe/Getty Images)