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KEY BISCAYNE, FL - APRIL 03: Kei Nishikori of Japan receives treatment between games while playing Novak Djokovic of Serbia during the final on Day 14 of the Miami Open presented by Itau at Crandon Park Tennis Center on April 3, 2016 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)

KEY BISCAYNE, FL - APRIL 03:  Kei Nishikori of Japan receives treatment between games while playing Novak Djokovic of Serbia during the final on Day 14 of the Miami Open presented by Itau at Crandon Park Tennis Center on April 3, 2016 in Key Biscayne, Florida.  (Photo by Matthew Stockman/Getty Images)