Rosario by KO. As far as I'm concerned a prime Camacho was far superior to Asa. The same left hook that wobbled Camacho puts Casamayor on his back.
Fouls away, but Rosario wins this one. I think it's probably a little closer, though, than Xplosive imagines (though, with that said, I have always had a healthy respect for Casamayor's capabilities, & have in the past been accused of over-estimating him), but evey little trick Casamayor could turn, Rosario was just as capable of, & then some. Incidentally, have to think Casamayor would've made a fight with Chavez at least a little more competitive than Rosario did.
Rosario was just the better fighter, he had all of the same skills, could box beautifully, and he was one of the hardest hitters of all time at 135... Casa is way tougher than he seems to be given credit for regularly here in MM, and hes dirty as fuck like Rosario, and contrary to FreeIke's insistence otherwise, he has some decent pop... I think its a good one but I see Rosario hurting Casa badly at some point and Joel stays too much on the defensive after that, Rosario clear decision with a knockdown thrown in