Benny Paret, Meldrick Taylor, Joe Frazier (after 1st Foreman fight), Razor Ruddock (after both Tyson fights), John Mugabi (after Hagler beat down), Floyd Patterson (after both Liston fights). Those are just a few, but there are a lot more in boxing history.
In fact the Margarito sustained kind of beating to the head and/or body can ruin fighters or takes years off their career. This is pretty much common knowledge in boxing. I'm pretty sure you may find 1 or 2 exceptions to the rule, but those are extremely rare. Fighters that take a sustain beating don't come back and beat elite fighters, and when I say elite, I'm talking either the no. 1 guy or 2 guy in the division or a top 10 p4p fighter. They either become ruin, shot, severely on the downside of their career. Fact.
EDIT: MAB was 1 of the rare exceptions after getting a beat down by Pac in '03 to go and have some good wins, like against Morales in their 3rd fight who would beat Pac in their 1st fight. But it is extremely rare in boxing history to come back from a massive beat down to beat an elite fighter.
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