Well the one i think that can beat Mayweather is Mosley he has the chin, Speed, power and stamina to do it somthing Dela hoy did not. Pac had problems with Marquaz because of his defence and boxing skill what the hell is he going to do to Mayweather who is far better. Then there is Cotto who is chinny and also has stamina issues in the last few rounds. And as for Margrito well he out of question now but even if he was he is to slow and would not be able to get anything done because of speed.