Vladyslav Sirenko just gave Zuffa Boxing 09 the kind of heavyweight ending that makes everyone in the room suddenly remember they have a pulse. Otto Wallin was seconds away from hearing the final bell at Madison Square Garden, then Sirenko detonated him with a right hand and left hook that ended the fight at 2:59 of Round 10.
This was not some lazy highlight clipped from a squash. Wallin had been competitive, Sirenko had been pushing through fatigue, and the fight looked like it was heading to the cards. Then the Ukrainian heavyweight found one last burst and turned the final second into a crime scene with ropes.
Watch the official Zuffa Boxing clip below:
🇺🇦 VLADYSLAV SIRENKO OUT OF NOWHERE 😵💫
HE KO's WALLIN IN THE FINAL SECONDS ‼️#ZuffaBoxing09 | 📺 https://t.co/59YzXQz8h5 pic.twitter.com/Kuli2vEbTJ
— Zuffa_Boxing (@Zuffa_Boxing) July 27, 2026
Sirenko Stole The Fight Before The Bell Could Save Wallin
Sirenko improved to 23-1 with 20 knockouts with the biggest win of his Zuffa Boxing run. Wallin fell to 28-4 with 16 knockouts, and the ending was rough enough that medical staff entered the ring before he was taken out on a stretcher.
The finish was nasty because it came after a fight that still had some mystery on it. Sirenko worked the body, bullied forward in stretches, and kept forcing Wallin to fight off the back foot. Wallin, a smart southpaw who has shared rings with major heavyweight names, answered with counters, footwork, and enough clean work to keep the result from feeling settled heading into the final minute.
That is what made the last exchange such a gut punch. Sirenko did not coast, did not admire his own work, and did not let Wallin jog into the scorecards. He landed the right hand, followed immediately with the left hook, and Wallin went face-first to the canvas without a count being needed. Heavyweight boxing is rude like that. You can do 29 minutes and 59 seconds of adult problem solving, then wake up wondering why everyone is staring at you.
The result also kept Zuffa Boxing’s New York card humming after a night that already gave MiddleEasy plenty to chew on, from Dana White’s growing boxing push to the main-event chaos around Edgar Berlanga and Steven Butler. Sirenko’s win was different. It was not built on belts, callouts, or promotional chess. It was built on one heavyweight finding a kill shot with the clock practically begging him to stop.
For Sirenko, this is the exact kind of violent calling card that changes how people talk about you overnight. Zuffa Boxing has already been stacking names and trying to make its cards feel bigger than another random boxing experiment, and a last-second heavyweight knockout is the easiest sell in the world. MiddleEasy has covered Zuffa Boxing knockouts before, but Sirenko waiting until the final blink to flatten Wallin is the sort of finish that will keep getting replayed long after the scorecards are forgotten.
