A full-bodied Hall of Fame welterweight, Mosley is thought to be the toughest opponent of Mayweather's career. The veteran boxer-puncher still ranks among the world's best fighters on merit: fluid offensive style, blinding hand speed, experience on the big stage. Problem is, Mayweather matches most of those strengths and trumps whatever's left. It's difficult to pick against Floyd in any fight that can be made today, not just because he's undefeated, but because he's never been in trouble in any of his pro outings. When Mayweather tucks his chin behind his shoulder, he becomes difficult (if not impossible) to hit flush.
Styles make fights. Mosley looked brilliant in his last fight, against Margarito 15 months ago, but the forward-moving Mexican was tailor-made for Mosley, who's at his best when opponents rush in. Against a counterpuncher like Mayweather, he'll have to be the aggressor and that's not his style. Mosley has also been vulnerable through the years against opponents with strong, purposeful jabs -- one of Mayweather's most reliable weapons.
Any questions about Mayweather -- and there aren't many -- center on an alleged lack of power at welterweight. Four-time Trainer of the Year Freddie Roach has repeatedly said Mayweather may be a Hall of Fame fighter at 135 and 140 pounds, but he's been merely pedestrian at 147 and can only dominate against smaller or less skilled opponents. Mosley will attempt to make it a firefight from the get-go and put Floyd's power to the test -- look for a committed body attack -- but forcing Mayweather to stand and trade bombs is easier said than done.
The other prominent question mark is Mosley's long stretch of inactivity. The earthquake in Haiti prompted the cancelation of a scheduled Jan. 30 fight with Andre Berto, who lost eight family members to the tragedy. Will Mosley be sharp enough for Mayweather after more than a year on the shelf? If Miguel Cotto outboxed a 36-year-old Mosley, it's reasonable to assume Mayweather won't be overwhelmed by the 38-year-old vintage.
Intangibly, there have always been questions about Mayweather's focus, but they've never manifested themselves in lackluster performances on fight night.