Tommy Fury beat KSI with a hugely controversial points win in Manchester on Saturday night.
Fury went into the bout as heavy favourite but was given a massive scare by the YouTuber-turned-boxer.
KSI gave Fury problems from the opening round with his unusual style of fighting.
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And he continued to find success in round two, with Fury having a point taken away for punching his opponent on the back of the head.
Fury came back into the fight in the third round, connecting with a series of crunching punches, before dominating the fourth.
The next two fights were closely contested but the judges ruled in favour of Fury, to the surprise of many at ringside.
One judge scored the fight 57-57, while two others ruled 57-56 favour of Fury - despite the points deduction.
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KSI later claimed he had been 'robbed' in his post-fight interview and suggested he would appeal the decision.
"Robbery, it's a robbery bro," said KSI.
"How many jabs did he land? And he had a point taken off as well. You weren't landing. Look at your face, look at your eyes. Look at you."
Fury replied: "You're a sore loser. You're a bum. Back to YouTube."
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KSI added: "How do I lose a six rounder? Unreal.
"He is the man who is meant to be a pro boxer and he won a majority decision? It's outrageous man. The amount of times he hit me in the back of the head. So many times. And the referee only took one point? He kept doing it over and over.
"I'm sorry, it's outrageous.
"We're going to appeal, I want to appeal. I felt like I won that."
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Earlier in the evening, Logan Paul beat Dillon Danis via disqualification after their fight ended in farcical scenes.
Danis attempted a guillotine choke in the final moments of the bout, prompting dozens of individuals to storm the ring - with security forced to separate the two camps.
Paul was eventually announced as the winner of the fight, with Danis disqualified for his actions.
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Topics: Boxing, KSI, Tommy Fury, Dillon Danis, Logan Paul