Roger Federer, of Switzerland, leaps into the air after defeating Ivo Karlovic, of Croatia,  6-4, 7-6 (7-4) at the Sony Open tennis tournament, Friday, March 21, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

Sony Open Tennis

Roger Federer, of Switzerland, leaps into the air after defeating Ivo Karlovic, of Croatia, 6-4, 7-6 (7-4) at the Sony Open tennis tournament, Friday, March 21, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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