If Logan Paul and Mike Tyson eventually fight in a celeb boxing match ... the YouTube star says he'd win -- exclaiming this weekend, "I would f***ing beat Mike Tyson."
The former heavyweight champ has been rumored to be a possibility for Paul's next big boxing match ... and Logan made it clear to media members Saturday that he'd beat the fighting legend if they met in the ring.
"He's too old," Paul said of Tyson ... "He's aging. Father time takes a toll on everyone.