There were crazy celebrations in KSI’s locker room as younger brother Deji secured his first boxing win on Saturday night.Deji defeated Fousey on his sibling’s undercard at the O2 Arena, his first triumph in four attempts.Big brother KSI watched on between victories over Swarmz and Luis Alcaraz Pineda, seemingly living every jab and hook.The eventual TKO saw KSI punch the air as if he had won the fight himself, such was the pride he felt for his brother’s success.Talking about Deji's victory at the end of the night, KSI said: "Incredibly proud. This is one of the best moments of my life."For him to showcase his skill. He just took his time. Comfortably went in and out, jabbing and jabbing.

"He came through with the cross over and over repeatedly, punching Fousey in the face.

"Deji smashed it and I'm so proud of him - I've told him several times. I told him he had it in him.

"I told him he is up there with the best boxers in the YouTube scene and he showed it tonight. I am so proud."

Deji was well worth the victory, putting on a clinic against the vastly inferior Fousey.

He hurt his opponent in the opening round, before scoring a knockdown in the second.

In the third, he forced a standing count which ultimately saw Fousey’s team throw in the towel with their fighter looking limp.

Deji had lost all three of his previous fights, losing to Jake Paul on the original KSI vs Logan Paul undercard in Manchester back in 2018.

He was commended for his gutsy performance on the night, giving his opponent all sorts of trouble, including a bloody nose.

Three years later, he returned to fight Vinnie Hacker in the YouTube vs TikTok showdown. Touted as the heavy favourite, Deji surprisingly lost by stoppage.

He admitted to not taking his training seriously enough, which led to criticism from KSI himself, who posted several videos on his YouTube channel highlighting his brother’s lack of effort.

It was not to be third time lucky as Deji lost to Alex Wassabi in March of this year.

The win was arguably the most popular of the night, even former adversary Jake Paul commended the fighter’s resolve to win.

A commentator on the DAZN stream pointed out, “Actually, this is his first pro fight, so he’s undefeated.”