Roger Mayweather: $10 Million
Roger Mayweather, superstar Floyd Mayweather Jr.'s uncle made a name for himself in the boxing world. He adopted the moniker "Black Mamba" after watching a documentary about the fierce snake, and he backed up his bravado with accomplishments. Roger held two championships, the WBA and lineal super featherweight titles and the WBC light welterweight title. He successfully defended the latter title four times before a 1989 fight against Julio Cesar Chavez forced his retirement.
