UFC 15: Collision Course

The event was headlined by a Heavyweight Championship fight between Maurice Smith and Tank Abbott, with Smith retaining the title. It also featured a Superfight between Randy Couture and Vitor Belfort that was billed as a number one contender bout, with the winner earning a heavyweight title shot at the next event. The card is historically important for introducing major rule changes, including bans on headbutts and groin strikes, marking a clear step toward modern MMA regulation.