All hell broke loose after the Jake Paul vs Nate Diaz press conference in Dallas, Texas as security teams clashed on stage.
The pair were at the American Airlines Center to promote their 10-round bout on Saturday night and traded insults while fielding questions from journalists.
Diaz was relatively calm despite being goaded by Paul, though he did rage at 'Derek', who works for Paul's Betr betting company and demanded he get up on stage after he said the Problem Child would knock him "the f*** out".
The two participated in the mandatory face-off but tempers were not flared as both performed their poses and flexed for the crowd before departing.
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However, the same could not be said for the teams providing security for both fighters as it all kicked off on stage.
It started as pushing and shoving before a brawl ensued and punches were thrown.
It's not known exactly what sparked the melee but eventually the teams went their separate ways and headed off the stage in opposite directions.
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Diaz's entourage do have previous for this kind of thing, with one fracas taking place at the weigh-in ahead of Paul's fight with Tyron Woodley.
A warrant for arrest was also issued after a video showed him choking out Logan Paul lookalike Rodney Petersen after the Misfits Boxing 6 event at the XULA Convention Center in New Orleans.
The Stockton native had been supporting teammate Chris Avila but got into it on Bourbon Street.
Diaz, who is making his boxing debut, is the latest MMA fighter to face Paul, who has beaten Ben Askren, Woodley and Anderson Silva.
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He suffered the first defeat of his professional career against Tommy Fury in Saudi Arabia back in February.
According to SportsLens, Paul is guaranteed to earn $2 million for the fight but could receive up to $5 million if he beats Diaz, who is set to collect up to $500,000. His purse will also double should he emerge victorious.
Josh Lawless