IMO Mayweather would have stopped him late, Floyd was just as smart but more aggressive and had a lot more power at 130 (or was willing to commit a lot more to his punches), he would have probably broken Casamayor systematically, jabbing upstairs then shooting that straight right to the pit of his stomach, move out then potshot with another right or two up top, Casamayor had the tools to trouble him with his defense and counterpunching but I just don't think he would have been able to deal with the movement and all around diversity of Mayweather
Floyd had alot more power at 130? Committed more to his punches? Maybe you should stick to Badminton Forums.