Youtuber Jake Paul (3-0, 3 KOs) has lashed out at cruiserweight prospect Tommy Fury (5-0, 4 KOs), who is the younger brother of WBC heavyweight champion Tyson Fury.
Paul and Fury have engaged in a war of words for the last few weeks.
Two weeks ago, Paul took part in his third pro fight as he stopped MMA veteran Ben Askren in the second round.
Paul and Fury have solid followings on social media.
While Paul believes a fight with Fury would be a major draw on pay-per-view - he rejected any possibility of doing a 50-50 split of the money, which was suggested by Fury's handlers.
He dared Fury to face an opponent with a winning record - although all three of Paul's pro opponents were non-boxers with zero experience.
"No-one has ever watched any of his fights, the only reason people know of him is because of me. He started talking about me and his brother called me out on his behalf. No-one has ever watched a Tommy Fury pay-per-view so no-one knows if he will do numbers at the box office," Paul told ESPN.
"His [promoter Frank Warren] went on TV and said send the contract, 50/50... I was like, get out of here with that. This guy only has a name and has articles written about him because of me and you're asking for 50/50... take it somewhere else. Maybe when he fights someone with a winning record and a highlight performance then it makes sense for us to fight, but until then, move on.
"Everyone wants me to fight the best fighter in the world but that's not how this fight game works; you build up your experience and you fight people at the same skill level. A lot of people fluff their record; Tommy Fury has fluffed his record like crazy. you see it all the time in boxing. The next test for me is to go up against a real striker and we'll see what happens next."