Brock Lesnar beat Frank Mir by TKO at UFC 100 Saturday night in a slow-moving 2-round match. As a result, Lesnar was booed by the fans, and he thanked them with his middle finger.

For most of the match, both men were on the floor of the Octagon, with Lesnar on top pummeling Mir with punches.

Lesnar, a former WWE and NCAA champion, holds UFC's heavyweight title.