Frances Tiafoe returns a shot from Roger Federer, of Switzerland, during a tennis match at the Miami Open, Saturday, March 25, 2017 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
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Frances Tiafoe returns a shot from Roger Federer, of Switzerland, during a tennis match at the Miami Open, Saturday, March 25, 2017 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
