We all know KSI isn't the type to lack confidence, but his latest claim might come as a surprise, even to his biggest fans.
The YouTuber-turned-boxer has told his one-time adversary Logan Paul that he would get the better of Floyd Mayweather in the boxing ring - adding that Paul could take Mike Tyson.
KSI made the audacious claim while appearing on Paul's podcast IMPAULSIVE, saying in a very self-assured manner: "I'd [beat] up Mayweather."
Paul, who took on Mayweather himself earlier this year, replied: "It's funny you said you could beat him. I wanted to ask you about this - you probably think you could beat most people?"
KSI then said: "I feel like that's the mentality you have to have."
Paul responded: "But then people laugh at you, it'll be headlines."
To which KSI replied: "People will be like, 'What? KSI thinks he could beat Mayweather? Shut up.'
"And then it's like, 'Alright, cool, let's go then.'
"Then it happens and everyone's like, 'Oh damn.'"
So there you go. Big talk, certainly - but KSI wasn't done there.
He then told Paul: "I think you could beat (Mike) Tyson.
"You've got to remember, this isn't Tyson who's 18, this is Tyson who's .
"People don't understand, we train like boxers."
Regardless of Tyson's age, this still seems like a grand claim - he returned to the ring last year for an exhibition match against fellow legend Roy Jones Jr, and if his recent videos are anything to go by, Iron Mike still packs a meaty punch.
The two YouTubers have already met in the boxing ring, of course - KSI took each other on back in 2019, with the match being ruled a majority draw.
Earlier this Summer, meanwhile, Paul went the distance in an eight-round exhibition fight with 44-year-old Mayweather.
Although he didn't win per se, he certainly came out of it with a financial victory thanks to the huge pay check he earned, reportedly netting $250,000 and a 10 percent cut of pay-per-view earnings.
Paul also told KSI about the 'f****ed s***' he said to Mayweather during their fight.
Twenty-six-year-old Paul admitted earlier this week that he actually 'regrets' some of the things he said to the legendary boxer while in the ring.
He said: "I hurt his feelings, I could tell.
"I go, 'There goes your legacy,' and he's like, 'What the f*** are you talking about?'
"And then I swung him. I was saying f***ed s**t. I was telling him I do sit-ups. I was calling him old. I was telling him I would re-retire him."
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