Sean Sharaf played the role of ultimate spoiler earlier tonight (Sat., Sept. 19, 2026) at UFC 331 LIVE on Paramount+ from inside Crypto.com Arena in Los Angeles, Calif., stunning undefeated Olympic gold medalist winner Gable Steveson with a brutal knockout sequence just 12 seconds into the first round. Entering Saturday night Steveson was a massive -2000 betting favorite. The previously undefeated heavyweight was considered one of the best prospects to ever come into UFC. With a world-class background in wrestling and constant training under head coach Jon Jones, Steveson was supposed to be on the fast track to heavyweight title contention, as long as he kept knocking down the guys UFC put in his way. The next name up was U.S. marine veteran Sean Sharaf, who pushed the envelope with Steveson during fight week and seemed more confident that he should have been considering his 0-2 UFC record before Saturday night. Against all odds, Sharaf needed just 12 seconds to land a career-changing left hand that blasted Steveson and sent him crashing to the canvas. Sharaf rushed in for more shots, but the win was already sealed. It’s one of the biggest upsets in UFC history and a moment that changed the trajectory of two completely opposite careers. Check out the 12-second demolition below: OH MY GOODNESS SEAN SHARAF KNOCKS OUT GABLE STEVESON!! 📺 @paramountplus pic.twitter.com/LthFlZJqPw — UFC on Paramount+ (@UFConParamount) September 20, 2026 THAT. JUST. HAPPENED. Sean Sharaf knocks Gable Steveson OUT COLD 📺 @paramountplus pic.twitter.com/LKcjPrwqHd — UFC on Paramount+ (@UFConParamount) September 20, 2026 ABSOLUTE. STUNNER. 📺 #UFC331 on @paramountplus pic.twitter.com/KYZ1gYOcnJ — UFC on Paramount+ (@UFConParamount) September 20, 2026 "I'm not surprised motherf**kers!" 🗣️ – Sean Sharaf 📺 #UFC331 on @paramountplus pic.twitter.com/mBGhB67pz5 — UFC on Paramount+ (@UFConParamount) September 20, 2026 Warms my heart pic.twitter.com/njj9x7ohEp — Matysek (@Matysek88) September 20, 2026 For complete UFC 331 results, coverage, and highlights click HERE.