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INDIAN WELLS, CA - MARCH 13: Kei Nishikori of Japan returns a shot against Mikhail Kukushkin of Kazakhstan during the BNP Paribas Open at the Indian Wells Tennis Garden on March 11 at Indian Wells Tennis Garden on March 12, 2016 in Indian Wells, California (Photo by Sean M. Haffey/Getty Images)

INDIAN WELLS, CA - MARCH 13:  Kei Nishikori of Japan returns a shot against Mikhail Kukushkin of  Kazakhstan during the BNP Paribas Open at the Indian Wells Tennis Garden on March 11 at  Indian Wells Tennis Garden on March 12, 2016 in Indian Wells, California  (Photo by Sean M. Haffey/Getty Images)