Mayweather doesn't have the teeth to be aggressive go after Hearns who is a quick and rangy. Mayweather takes what he can get when he fights aggressively and often only does so to win rounds. This is more true at 147 than at 135 or 140, and the 147 pounder Hearns from 1981 has brutal skills, speed, and power. Mayweather also counterpunches by using his reach and doing that pull counter. He can't do that as effectively trying to chase Hearns back with a right hand off Tommy's jab - he would simply be out of range. He would have to step in, leaving him open to a right hand, especially if Tommy feints a lot with his left. If Tommy can't be worn down physically, by someone else setting the pace, or by crunching power, then he will still be there after 12 rounds. Mayweather never jacks up the pace. Let's say this is a 12 rounder since Floyd has never proven himself in 15. If that is the case, Tommy's stamina is less of a concern.
Tommy wins
