pac's only chance to mayweather is a draw.. mayweather running all night = draw hit & run = UD or split
A good stiff Jab, KO power in the right and the ability to go from defense to offense seamlessly, a guy than can slip punches while coming in to inflict damage.
Either you have to be Aaron Pryor who beat Arguello applying non-stop pressure or JMM w/ Valero's power.
you have to be either a skilled counter puncher like marquez or you have to be a ring general/technician and out smart the pacman like el terrible.... cotto is imo underrated as a counter-puncher, but is he a marquez? i dont think so.