Who defeated Frank Mir in the UFC 100 main event?

Who defeated Frank Mir in the UFC 100 main event? Brock Lesnar defeated Frank Mir in the UFC 100 main event.

Their July 11, 2009, heavyweight championship unification bout was a rematch. Mir had submitted Lesnar by kneebar at UFC 81 in 2008, handing Lesnar his first UFC defeat. Lesnar then won the heavyweight title from Randy Couture at UFC 91, while Mir became interim champion by defeating Antônio Rodrigo Nogueira.

At UFC 100, Lesnar reversed the rivalry’s momentum with a second-round technical knockout. He used his size, wrestling, top control, and ground-and-pound to overwhelm Mir and unify the heavyweight championship. The result established Lesnar as one of the UFC’s biggest stars of that era.

The event also featured Georges St-Pierre defending the welterweight title against Thiago Alves and Dan Henderson defeating Michael Bisping. UFC 100 became a landmark pay-per-view, drawing a reported 1.6 million buys, though UFC 202 later surpassed that figure.