Erik Perez is two for two. After a submission win over John Albert in his UFC debut, he stepped in the cage at UFC 150 against Ken Stone and knocked him out in just 17 seconds. Stone got caught by a monster counter right that sent him to the mat facefirst. He was still awake, but Perez jumped into his guard and pounded him out. It was the fastest knockout in UFC/WEC history in the bantamweight division.
Stone was actually unconscious from the second-to-last punch on the ground, but the last punch seemed to wake him back up and he started defending again. Referee Herb Dean was already stepping in to stop the fight though, and it was definitely a good stop. Stone's two-fight win streak was snapped, and he fell to 2-2 in the UFC. Perez is 2-0 in the UFC and 12-4 overall.