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INDIAN WELLS, CA - MARCH 12: Juan Martin del Potro of Argentina returns a shot by Tomas Berdych of Czech Republic during the BNP Paribas Open at the Indian Wells Tennis Garden on March 12, 2016 in Indian Wells, California (Photo by Sean M. Haffey/Getty Images)

INDIAN WELLS, CA - MARCH 12:  Juan Martin del Potro of Argentina returns a shot by Tomas Berdych of Czech Republic during the BNP Paribas Open at the Indian Wells Tennis Garden on March 12, 2016 in Indian Wells, California  (Photo by Sean M. Haffey/Getty Images)