UFC on Fox 21 is a mixed martial arts Welterweight main event card produced by the Ultimate Fighting Championship (UFC) between Demian Maia (23-6-0, 3 KO's) from São Paulo, Brazil and his opponent Carlos "The Natural Born Killer" Condit (30-9-0, 15 KO's) from Albuquerque, New Mexico. This is the Preliminary card of bouts and it is being broadcast live tonight from Rogers Arena in Vancouver, British Columbia, Canada.

The scheduled Preliminary bouts are as follows:

Featherweight: Enrique Barzola vs. Kyle Bochniak

Lightweight: Shane Campbell vs. Felipe Silva

Middleweight: Garreth McLellan vs. Alessio Di Chirico

Middleweight: Sam Alvey vs. Kevin Casey