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The 44-year-old boxing legend returned to the ring in June where he went head to head against 26-year-old YouTuber, Logan Paul.
The fight went the full eight rounds with neither man being able to knock the other out... or so we thought.
That was until Mayweather spoke at the WBC convention and revealed that he would have won. Not only does he believe he would have defeated his opponent but he reckons he'd have knocked Paul out in the first round.
Speaking at the convention, Mayweather said: "I did an exhibition with the YouTuber Logan Paul. We had fun.
"People gotta know, there's a difference between a real fight and an exhibition. All I did was work out from time to time. If it was a real fight, it would've been a blowout in the first round."
Mayweather hung up his gloves (at least his professional ones anyway) back in 2017 after he beat ex-UFC champion Conor McGregor.
Since then, he's completed exhibitions with featherweight kickboxer Tenshin Nasukawa, 23, in 2018 followed by Logan Paul earlier this year.
It seems the fight with Paul could be his last, too, as he went on to say: "I'm OK. Floyd Mayweather made a lot of smart investments.
"One of the buildings I own is the tallest commercial building in America. So if you get a chance go to New York and check it out. This is my ninth skyscraper."
Well they don't call him 'Money' Mayweather for nothing, do they? Oh and if you're wondering, the building is One Vanderbilt - he's got stakes in it.
Speaking after their fight in June, Logan said it was an 'honour' to step in the ring with the legend, adding that he was 'happy to make it out'.
However, beforehand he was much more confident, saying: "There's a moment that goes through every fighter's mind. Everyone we spar, everyone Jake's bear.
"When we hit them, they realise, 'Oh, he might not just do YouTube. This guy really put his heart and soul in this.'
"I hit hard. I think you're going to see Floyd's eyes light up, the first time I hit him."
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