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KEY BISCAYNE, FL - MARCH 31: Angelique Kerber of Germany returns a shot to Victoria Azarenka of Belarus during the semifinals of the Miami Open presented by Itau at Crandon Park Tennis Center on March 31, 2016 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)

KEY BISCAYNE, FL - MARCH 31:  Angelique Kerber of Germany returns a shot to Victoria Azarenka of Belarus during the semifinals of the Miami Open presented by Itau at Crandon Park Tennis Center on March 31, 2016 in Key Biscayne, Florida.  (Photo by Matthew Stockman/Getty Images)