Top 5: Fastest UFC light heavyweight knockouts

Ryan Jimmo made a loud, memorable and convincing opening statement in the Ultimate Fighting Championship ’s court of public opinion. The Canadian karateka introduced himself to the masses with a first-round knockout of Anothony Perosh in their UFC 149 light heavyweight prelim on July 21, 2012 at the Scotiabank Saddledome in Calgary, Alberta. Operating in the shadows of the Urijah Faber - Renan Barao main event, Jimmo drew the curtain a mere seven seconds into his dazzling promotional debut.

Jimmo entered the cage on a 16-fight winning streak and threw one right hand. It connected with disastrous consequences for Perosh. The concussive blow separated the Australian grappler from his senses and left him slumped and defenseless against the cage, allowing Jimmo to land one last standing-to-ground right hand for good measure.

It was Perosh’s first loss in more than two years. “I just went at him,” Jimmo said afterward, “and I knew when I threw some heavy leather [that] he was going to be on the bad end of it. ” Well over a decade later, Jimmo’s lightning-strike finish of Perosh still ranks as the fastest knockout in the history of the UFC light heavyweight division.

The best of the rest: James Irvin vs. Houston Alexander UFC Fight Night 13 April 2, 2008 | Broomfield, Colorado Irvin vaporized the Nebraskan in the first round of their light heavyweight showcase at the Broomfield Event Center in suburban Denver. Alexander clocked out just eight seconds into Round 1.