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INDIAN WELLS, CA - MARCH 16: Kei Nishikori of Japan returns a shot to Fernando Verdasco of Spain during day eight of the BNP Paribas Open at the Indian Wells Tennis Garden on March 16, 2015 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)

INDIAN WELLS, CA - MARCH 16:  Kei Nishikori of Japan returns a shot to Fernando Verdasco of Spain during day eight of the BNP Paribas Open at the Indian Wells Tennis Garden on March 16, 2015 in Indian Wells, California.  (Photo by Matthew Stockman/Getty Images)