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CHOFU, JAPAN - OCTOBER 06: Kei Nishikori of Japan celebrates in the Singles semi-final round against Richard Gasquet of France on day six of the Rakuten Open at Musashino Forest Sports Plaza on October 6, 2018 in Chofu, Tokyo, Japan. (Photo by Koji Watanabe/Getty Images)

CHOFU, JAPAN - OCTOBER 06: Kei Nishikori of Japan celebrates in the Singles semi-final round against Richard Gasquet of France on day six of the Rakuten Open at Musashino Forest Sports Plaza on October 6, 2018 in Chofu, Tokyo, Japan. (Photo by Koji Watanabe/Getty Images)