I truly love Tommy Hearns with all my wizened heart & my blackened little soul, but Monzon is a fucking terrible match-up for him, a great big lengthy tall guy who was a natural middleweight & who had an amazing chin (though I think Valdez put him over once, maybe in the rematch), a decent punch & a great engine. I think Monzon sufferes historically-speaking 'cos he wasn't elegant or devastating or, y'know, impressive-looking, he was just a big hard lanky basic guy who never gave up or slowed down & chipped away at you until he got the results he wanted.
Monzon would get to Tommy late, possibly whilst behind on points... & it makes me want to cry, typing that. I bet The Hitman would go down swinging, though. Motherfucking balls of steel, that guy (just a pity, as my old man liked to say, they never put any of that steel in his chin).