I don't know if it was fixed either. "S" beating Kimbo kind of reminded me of the schoolyard fights I used to see when I was younger. It's true that the bigger, muscular guys usually dominate, but every once in a while, a smaller, more experienced guy would come along and fight off his larger attacker. Kimbo is big and very experienced, but this smaller Petruzzelli fellow may simply have better punches or even better neuromuscular recruitment for doing such.

It's no different than a smaller man lifting heavier weight; if his neuromuscular recruitment is better, than he WILL be stronger. Petruzelli (at least at that time) was simply the BETTER fighter.

(No disrepect to Kimbo, by the way.)