UFC 83: Serra vs. St-Pierre 2 was a mixed martial arts event held by the Ultimate Fighting Championship. The event was held on April 19, 2008, at the Bell Centre in Montreal, Quebec, Canada.

Cain Ramírez Velásquez is an American professional wrestler and retired mixed martial artist, currently appearing for Lucha Libre AAA Worldwide (AAA). He is widely known for his time in the Ultimate Fighting Championship, where he competed in the heavyweight division and became a two-time UFC Heavyweight Champion.