i dont recall that situation at all, i just watch the second round, he landed one punch at the end but you are very wrong when you use the word "stun", you probably got influence by the commentator...
you could actually see it on youtube... he landed a shot to cotto, which cotto took it quite well... you probably got persuaded by the commentator when he said momentarily it back cotto... but cotto was already moving back, cotto came right back with a left.... this was a one sided... sosa never had cotto in trouble, it was an assination by the end of the fight...
I dunno. Jimmy Thunder-Crawford Grimsley was pretty one sided. Thunder walked out of his corner, threw a punch and Grimsley was out cold. That's pretty one-sided if you ask me. :nod
Assuming that it was a fight that was supposed to be around even odds, Calzaghe/Lacy, Mijares/Arce, Green/Codrington and Pac/Morales III are a few recent ones that immediately come to mind.