Rampage fight against Marco Bermudaz might just be the sickest thing I've ever seen.
He just picks him up and slams him whenever he wants to, and you can see that Marco isn't the lightest guy in the world :)
That and the Chuck fight are probably his 2 best fights ever. I mean Igor is awesome, and Rampage played it smart, played it to his strengths the whole time and took very little damage against one of the deadliest strikers this sport has seen.