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KEY BISCAYNE, FL - MARCH 27: Kiki Bertens of the Netherlands returns a shot to Angelique Kerber of Germany during the Miami Open presented by Itau at Crandon Park Tennis Center on March 27, 2016 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)

KEY BISCAYNE, FL - MARCH 27:  Kiki Bertens of the Netherlands returns a shot to Angelique Kerber of Germany during the Miami Open presented by Itau at Crandon Park Tennis Center on March 27, 2016 in Key Biscayne, Florida.  (Photo by Matthew Stockman/Getty Images)