Its an interesting fight, its my belief Pacman is the closest person because of his offensive skills, being southpaw, and speed to beating Mayweather. However, if Mayweather figures out his rhythym then Pacquiao is screwed. I mean Marquez very quick and a good counter puncher, but he totally figured out how to nullify much of what Pacman is so successful at. Mayweather is bigger than Marquez probably hits a little harder, and is faster if he adapts then Manny is as good as done at any weight class.