Vasquez - Marquez III definately in my opinion, allthough I thought Casa - Katsidis was a very entertaining fight aswell.
My vote goes to Casa/Katsidas. That fight looked like it was over in the first round and again in the sixth. Both fighters showed tremendous heart, with Kat doing all he could to grab true glory for the first time and Casa reaching deep one more time to keep Father Time away. Great fight.