Caol Uno
Upon his impressive debut against wrestler Joey Gilbert (a first-round TKO), Penn rose quickly through the rankings. Penn, already known for his grappling, quickly stunned the MMA community by showcasing incredible striking skills; quickly knocking out highly regarded Din Thomas, then knocking out Caol Uno within eleven seconds of the first round. Heading into the fight with Pulver, Penn had never fought longer than the first round. The speed in which Penn was defeating opponents had many MMA journalists suggesting he was unbeatable.