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INDIAN WELLS, CA - MARCH 18: Kei Nishikori of Japan in action in his match against Rafael Nadal of Spain during day twelve of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Julian Finney/Getty Images)

INDIAN WELLS, CA - MARCH 18:  Kei Nishikori of Japan in action in his match against Rafael Nadal of Spain during day twelve of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California.  (Photo by Julian Finney/Getty Images)