Mosley is the best fighter Mayweather Jr has ever faced

[RockyB]

cotto is a controversial loss and maryorga is a difficult and wild style in which you have to be very cautious, but even at that, he ko'd him too.

not to mention it was at 154, where i havent exactly been impressed with Mosley.

[Chups]

Dela Hoya has better record than Mosley. Well it could be a draw between Oscar and Shane.

[Kilrain]

It's just kind of difficult to gauge where Shane's at. We all know he wants Mayweather and he's gonna train like a mofo to get in the best possible condition. But he's been out of the ring for 16 months, not good for a guy in his late thirties who's been around the sport for his entire life, almost 20 years as a pro. Sure, the Margarito win was phenomenal, one of his career highlights, but has some rust set in, has father time caught up with him? I would even have liked him to fight a lesser opponent when Berto stayed out, just so he could get some rounds in.

[bojangles1987]

No doubt, even at near 40, Shane Mosley is the best fighter Floyd has ever fought.

[S.G.]

It's just kind of difficult to gauge where Shane's at. We all know he wants Mayweather and he's gonna train like a mofo to get in the best possible condition. But he's been out of the ring for 16 months, not good for a guy in his late thirties who's been around the sport for his entire life, almost 20 years as a pro. Sure, the Margarito win was phenomenal, one of his career highlights, but has some rust set in, has father time caught up with him? I would even have liked him to fight a lesser opponent when Berto stayed out, just so he could get some rounds in.

Yeah I think we're gonna have to rely heavily on his actual performance to decide the answer to the OP's question. I have the feeling he's a bit too far gone to be competetive with Mayweather all the way through the fight but I'll readily rescind that if he comes in and puts on a great performance. I will say that an on-form, peaking Mosley would be the best fighter Floyd has faced.