Rios vs Acosta.

I believe it was the 4th round (my memory is going don't flame me if I'm wrong) where Rios looked a little worse for the wear at the end of a round.

He can take some hellacious shots. But there will be a point in his career where his chin just can't take that many big shots before giving in.

I think at 140 Rios will have to alter his style. He is going to have to take less clean bombs. Or else with bigger guys, that chin very well may get dented.