Mosley is not Marquez, he is bigger and he's been a junior middleweight who is now a welterweight. He has pop in his punch and faster than Marquez that even though outclassed and out gunned still got Mayweather with some rights. Mayweather could not knock out a man that was made to order for him and I will say one thing, I wouldn't be surprised to see his butt on the canvas. Mosley was written off after Cotto but look what happened when an experienced corner and an experienced fighter uses intelligence against youth and brute force with good stamina to kayo a man labeled a destructive force in the welterweight division. Floyd should be wondering if that same man that took out Margarito is the one that shows up fight night.