Zab stepped on Floyds foot when he landed the punch. There's actually a pic of it floating around somewhere.
Genaro Hernandez was first to nock him down watch: [ame]http://www.youtube.com/watch?v=HU5eQThEwJI[/ame]
This thread shows are desparate some people are to disparage Floyd. How desperate they are to find something, to give them hope that their hero can beat him.
Definately a knockdown no question, however it was more of a balance issue. I don't believe he was genuinely hurt or stunned.
I'll end this. It was a knockdown, but wasn't ruled by the ref. Even if the ref had ruled it a knockdown, he still dominated the fight and would have won. Yes, he could have lost the first bout against Castillo, but he was injured and immediately said after the fight he would rematch him. Floyd did rematch him and dominated with both his hands intact.
We know, we know. Hatton would have killed Mayweather if Cortez did his job properly. Hatton is light-years ahead of Mayweather in terms of talent and ability.