KEY BISCAYNE, FL - MARCH 25: Naomi Osaka of Japan returns a shot to Sara Errani of Italy during the Miami Open presented by Itau at Crandon Park Tennis Center on March 25, 2016 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)
KEY BISCAYNE, FL - MARCH 25: Naomi Osaka of Japan returns a shot to Sara Errani of Italy during the Miami Open presented by Itau at Crandon Park Tennis Center on March 25, 2016 in Key Biscayne, Florida. (Photo by Matthew Stockman/Getty Images)