Rafael Nadal, of Spain, returns the ball to Denis Istomin, of Uzbekistan, during the Sony Open Tennis in Key Biscayne, Fla., Monday, March 24, 2014. Nadal won 6-1, 6-0. (AP Photo/J Pat Carter)
Rafael Nadal, of Spain, serves to Lleyton Hewitt, of Australia, at the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)