Radivoje Kalajdzic pulled off one of the wildest upsets of the young year, stopping Oleksandr Gvozdyk in the seventh round at Zuffa Boxing 02 on Saturday night. It was the kind of fight that looks like it’s over early, then somehow completely turns around, leaving a former champion stunned and a heavy underdog.
Oleksandr Gvozdyk came out looking every bit the favorite. He controlled the opening rounds with his feet and his timing, dropping Radivoje Kalajdzic twice early, including a clean right hand that put Kalajdzic hard on the canvas. Throughout the first stretch of the fight, Gvozdyk landed first and last, piling up rounds and dictating the pace as if the night was headed for a routine decision.
Kalajdzic remained patient and continued to press forward, even after dealing damage that would have broken many fighters. As the rounds wore on, his right hand began to find a home, and Gvozdyk’s reactions slowed just enough to invite exchanges he had previously avoided. The shift was gradual, but it was real, and the confidence began to soar.
That swing turned into a collapse in the seventh. Kalajdzic caught Gvozdyk with a series of heavy shots that snapped his head back and left him visibly shaken. Gvozdyk went down, beat the count, but never regained his balance, and when Kalajdzic threw in more right hands, the referee stepped in to stop the fight and seal a dramatic TKO.
For Gvozdyk, the loss is a damaging one after controlling so much of the fight. For Kalajdzic, it’s a career-defining win built on toughness and belief, climbing off the floor to stop a former world champion who looked untouchable early on.
The 10-round light heavyweight bout took place on February 1, 2026 at Zuffa Boxing 02 inside the UFC Apex in Las Vegas. The card streamed on Paramount+.
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Last updated on 02/01/2026
