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INDIAN WELLS, CA - MARCH 17: Kei Nishikori of Japan returns a shot to Jack Sock during the quarterfinals of the BNP Paribas Open at the Indian Wells Tennis Garden on March 17, 2017 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)

INDIAN WELLS, CA - MARCH 17:  Kei Nishikori of Japan returns a shot to Jack Sock during the quarterfinals of the BNP Paribas Open at the Indian Wells Tennis Garden on March 17, 2017 in Indian Wells, California.  (Photo by Matthew Stockman/Getty Images)