YouTube star Kristen Hanby threw a punch at his prankster rival Vitaly at. the open workout ahead of their boxing fight.
The social media stars have been sharing digs since announcing their bout earlier this year, but their rivalry turned physical at a media workout in London on Wednesday.
Vitaly, from Russia and representing Team USA in a battle with Hanby's Team UK took to the stage drowned by a chorus of boos, before making way for Hanby.
He mocked the Brit in his workout by throwing mock punches and feigning running away from his trainer, before vowing to knock Hanby out.
"It's his life, his choice," Vitaly told fans at the London venue. "He's got f***ing 60 seconds mark my f***ing words.
"He's talking s*** for no reason, he picked this fight and told me not to lose any weight, I lost 15kg and he's about to get it."
But it was Hanby who ended up landing the first punch of the pair's feud.
The Jersey native took to the stage and participated in a workout of his own before blasting the Russian as a "s***bag" and made derogatory comments about his mother in the crowd.
That was the final straw which forced Vitaly to return to the stage in retaliation, attempting to get the fight to happen days before the first bell.
Hanby immediately swung for his rival, touching him with a left before barely missing with a big right hand in his oversized training gloves.
Speaking with Mirror Fighting immediately following the incident, Hanby declared that he was now in the ascendancy for the contest, calling the exchange a 10-9 round.
"So I was on stage talking my s*** and I see him running at me," he explained. "I tried to land a right hand and it just missed.
"I was I caught him flush and put him out, it's going down Saturday and this has made it even more heated.
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"I was talking about his mum and saying she's going to get it, and he's going to get it on Saturday.
"It's 100 per cent [10-9 Hanby], he came running up looking stupid, he's got me even more hyped.
"I think that was a bad decision from him, I threw a right hand at him and I think he's scared now. Boom."
The pair will compete on the undercard of Deji vs Alex Wassabi at the OVO Arena Wembley on Saturday night, with Hanby having to gain considerable weight to get to the Russian's level.
Neither of the two pranksters have fought before, but they have been training intensely for the fight and are predicting stoppages when the bout eventually happens.
Tickets are on sale now at showstarboxing.com and via AXS for Showstar Boxing 2022, which will be headlined by Deji vs Alex Wassabi.
If you're outside of the UK, you can watch the fight on PPV via the Showstar website for £6.99.
