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Floyd Mayweather got into a physical brawl with Jake Paul that ended with the boxer furious and Paul nursing a black eye and busted mouth.
The pair came head-to-head at an event to promote Mayweather's exhibition bout with Logan Paul in June - but what started as a verbal confrontation ended with the pair involved in a fight in the corridors of the venue in Miami.
Paul was left nursing a damaged eye and lip, but proudly holding Mayweather's stolen hat. Former pound-for-pound king Mayweather stormed around in a rage after the pair were eventually separated.
The face-to-face between Mayweather and Jake began with Logan's younger brother telling Floyd to "Call, [manager Leonard] Ellerbe, let's make it happen" suggesting a future fight between the two.
Mayweather responded: "I'm my own boss," before Jake Paul snatched his hat and ran off.
'Money' Mayweather gave chase and - while a melee of press and cameras surrounded them - it was clear that a fight ensued between the pair. Especially given the damage Paul was left with.
The 24-year-old Paul, clearly a glutton for punishment, stuffed Mayweather's hat inside his T-shirt to protect his prize.
However it seems he did a far worse job of protecting his own face as images afterwards - shared by 'The Problem Child' on Instagram - showed him with a badly swollen eye and damage to the mouth.
Paul, who boasts a 3-0 pro boxing record against Mayweather's 50-0 (admittedly against somewhat better opposition) was eventually ushered away by security and through a door away from the hallway.
Jake Paul took to Twitter quickly afterwards to claim it was one of Floyd's bodyguards who inflicted the damaging blow upon his face.
However a hatless Mayweather was clearly irate afterwards, as he prowled the Hard Rock Cafe venue promising: "I'll kill that motherf*****."
Pure WWE or did Jake Paul really go too far and enrage the 43-year-old former pound-for-pound king?
Love it or hate it, we won't have heard the last of this.