I believe if Hatton knocks out Mayweather, he will definitely be number 1 P4P. No one has ever knocked MAyweather. If Hatton does knock Mayweather, that's more than amazing. He should be number 1 then.Mayweather should be number 3. This will be next ranking in case Hatton wins:

1. Hatton
2. Pacman
3. Mayweather
4. the rest you may supply.