Floyd Mayweather Jr. , on left, is undefeated, a six-time world champion and perhaps the biggest draw in boxing. 
Shane Mosley is a great champion who’s past his prime and probably couldn’t carry a pay-per-view card by himself.
However, it’s Mayweather who has the most to prove from Saturday night’s welterweight bout in Las Vegas (HBO Pay-Per-View). He’s arguably the most-skilled boxer in the world.
Instead of that distinction drawing him praise, Mayweather is reviled for his defense-first style, as well as his big mouth.
He prides himself on being the greatest ever (in large part to his 40-0 record) and at the same time he’s in a slugfest to be considered the best boxer today.
Manny Pacquiao ostensibly holds that crown as much for his recent accomplishments as his penchant to be a warrior in the ring. Courage is what separates Mayweather and Pacquiao in many people’s perceptions — with Pacquiao being a gusty fighter while Mayweather hits and runs.
Only time will tell who will emerge victorious.
Vegas Backstage Access (VBA) 