Mayweather is the best fighter in the world but Pac deserves to be at 1 because he is staying active. Sergio is really closing the gap though.
Right now it has to be Pacquiao/Martinez/Mayweather/Donaire. Realy its tough to even have Floyd #3.The man just doesn't fight. Floyd Jr can be #1 easy.But you have to fight.
I don't mind people ranking either of these 4 number 1. But I don't buy into the "until he loses or retires" argument. In my opinion p4p isn't lineal; it's subjective.