6. FLOYD MAYWEATHER JR. $32 million
Photograph By Isaac Brekken/AP Images
When your nickname is Money, you'd better have the goods to back it up: Mayweather (44-0) signed a six-fight contract worth an estimated $200 million with Showtime in February before dominating Robert Guerrero in their WBC welterweight title bout. His next fight, against Saul "Canelo" Alvarez, could set pay-per-view revenue records.