Slim Abaher has knocked out Salt Papi in round four of their fight on the Misfits Boxing Prime card.
Salt Papi started the fight well, landing a straight left to the head in round one.
And he continued to up the pace into rounds two and three, and it looked as if he would secure a huge victory.
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But Slim stormed back in the fourth round, and despite being caught in the corner by his opponent, he struck Salt Papi with a swift left hand.
That caused Salt Papi to stumble backwards, and Slim nailed a swift combination to floor his rival.
That wasn't to be the end of the action, though, as Salt Papi somehow made it to his feet.
But Slim then continued to pile on the pressure and the punches, leaving the referee with no choice but to wave off the contest via knockout.
Slim therefore won the Misfits Boxing Middleweight Championship, having dropped down from light-heavyweight ahead of the fight.
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Slim went into the bout with an unbeaten record, having won all six of his previous fights. Four of those came by knockout.
But that record looked to be in serious doubt as Salt Papi, a YouTube star with nearly 600,000 subscribers, quickly took control of the contest.
However, the American YouTuber managed to turn the tables in the final round to record a memorable victory.
After the fight, Slim was approached by FaZe Jarvis, who appeared to be intent on setting up a future fight between the pair.
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But Slim wasn't having any of it, telling interviewer Ariel Helwani: "Can you show this guy, the exit's right over there? The exit's right over there, buddy."
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Topics: Boxing, KSI, Tommy Fury