INDIAN WELLS, CA - MARCH 18: Kei Nishikori of Japan returns a shot to Rafael Nadal of Spain during the BNP Paribas Open at the Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)
INDIAN WELLS, CA - MARCH 18: Kei Nishikori of Japan returns a shot to Rafael Nadal of Spain during the BNP Paribas Open at the Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)