Jake Paul wasted absolutely no time in mocking KSI following his controversial defeat to Tommy Fury in Manchester.
KSI was beaten on points by Fury to the surprise of many at ringside at the AO Arena on Saturday night.
The YouTuber-turned-boxer caused Fury problems from round one and looked like pulling off a shock win, particularly after his opponent had a point taken off for punching the back of the head.
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But the judges scored the six-round bout in favour of Fury, with one scoring it a 57-57 draw and two others ruling it 57-56 for the Mancunian fighter.
KSI was furious with the result and claimed in his post-fight interview that he had been 'robbed' - vowing to appeal the decision.
Jake Paul, who was at ringside to see his holder brother Logan defeat Dillon Danis earlier in the evening, was quick to react to KSI's outburst.
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He posted on X: "HAHAHAHA KSI SORE LOSER CHOKING UP."
Paul then followed that up with a second post, which read: "Only thing that got robbed is his hair line. It’s okay KSI me too it’s gonna be okay bubba."
He then posted a picture of himself flooring Fury in their own fight, alongside the caption: "Never forget who runs this s***."
Paul then added: "I took my loss like a man from the scorecard read and showed the youth how to learn from it and come back to take a W.
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"This 30 year old man crying for an appeal."
Earlier in the evening, Paul's older brother Logan beat Danis after their fight ended in disqualification for the MMA fighter.
Danis bizarrely attempted a guillotine choke in the final moments of the bout, prompting security to storm the ring.
Paul was eventually announced as the winner of the fight, with Danis disqualified for his actions.
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Topics: Jake Paul, Tommy Fury, KSI, Logan Paul, Boxing
Rory O'Callaghan