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TOKYO, JAPAN - OCTOBER 09: Kei Nishikori of Japan celebrates a point during the men's singles qauter final match against Marin Cilic of Croatia on day five of Rakuten Open 2015 at Ariake Colosseum on October 9, 2015 in Tokyo, Japan. (Photo by Atsushi Tomura/Getty Images)

TOKYO, JAPAN - OCTOBER 09:  Kei Nishikori of Japan celebrates a point during the men's singles qauter final match against Marin Cilic of Croatia on day five of Rakuten Open 2015 at Ariake Colosseum on October 9, 2015 in Tokyo, Japan.  (Photo by Atsushi Tomura/Getty Images)