May 4, 2013 // 9 p.m. ET (Showtime PPV)
MGM Grand, Las Vegas
It stands to reason that the edge here should go to the five-time world champion. But Mayweather hasn't merely accrued his wealth of experience while fighting the likes of world-class opponents Oscar De La Hoya, Shane Mosley, Juan Manuel Marquez, Ricky Hatton and Jose Luis Castillo, among others. Raised in the gym and having hung around rings all his life -- tagging along with his father, Floyd Sr., and his uncle and trainer, Roger (a former world champ) -- boxing is all but encoded in Mayweather's DNA.
Written by Bernardo Pilatti