Floyd Mayweather Jr. will retire a perfect 50-0 -- but hey, at least the newbie Conor McGregor made him work for it. McGregor's first boxing match was a heckuva show -- the 29-year-old mixed ...

Millionaire fighters like Floyd Mayweather and Conor McGregor are the exception rather than the rule. A lot of boxers and mixed martial artists (MMA) moonlight as taxi drivers or bricklayers as ...