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KEY BISCAYNE, FL - MARCH 30: Madison Keys plays a match against Angelique Kerber of Germany during Day 10 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 30, 2016 in Key Biscayne, Florida. (Photo by Mike Ehrmann/Getty Images)

KEY BISCAYNE, FL - MARCH 30:  Madison Keys plays a match against Angelique Kerber of Germany during Day 10 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 30, 2016 in Key Biscayne, Florida.  (Photo by Mike Ehrmann/Getty Images)