Roger Federer, of Switzerland, returns the ball to Ivo Karlovic, of Croatia, at the Sony Open tennis tournament, Friday, March 21, 2014, in Key Biscayne, Fla. Federer defeated Karlovic 6-4, 7-6 (7-4). (AP Photo/Lynne Sladky)

Sony Open Tennis

Roger Federer, of Switzerland, returns the ball to Ivo Karlovic, of Croatia, at the Sony Open tennis tournament, Friday, March 21, 2014, in Key Biscayne, Fla. Federer defeated Karlovic 6-4, 7-6 (7-4). (AP Photo/Lynne Sladky)

Top Ranked Players
More Rankings