Villasenor is the former King of the Cage Middleweight Champion, and defended this title seven times before vacating it to sign with PRIDE.

Villasenor first began watching UFC events when he was 17 or 18 years old, but thought that the fighting was brutal, although he wanted to learn self-defense.

[2] Villaseñor made his professional debut in April 1999 and after 15 consecutive wins, he was signed by the PRIDE Fighting Championships.

Despite losing a decision, Villaseñor was brought back by the organization to fight UFC veteran Robbie Lawler at PRIDE 32.

It was recently announced that Villaseñor would receive a title shot in a rematch against Robbie Lawler on the scheduled November 8, 2008, EliteXC show.

The fight was initially ruled a draw, but was subsequently overturned and counted as a win for Camozzi by the New Mexico Athletic Commission when it was revealed one of the judges scores was added incorrectly.