Matchroom and Anthony Joshua promoter Eddie Hearn has insisted he will not pay over his initial offer sent to Deontay Wilder to fight 'AJ'.
A mega-fight between the two reigning heavyweight champions has been rumored to be in the works, as this month Hearn reportedly offered Wilder a fee of $12.5 million (£8.8 millions) to meet Joshua in a unification bout.
Joshua currently holds the IBF, IBO, WBA, and WBO world titles, while Wilder owns the WBC version of the world championship - the winner of the fight would be the first ever unified heavyweight champion to hold all titles.
A mega showdown between the two seemed inevitable after the first offer had been made, however, Wilder’s team appear to believe the deal was not respectable.
And now, the fight seems in jeopardy as Hearn told BoxingScene.com in an interview he is not open to re-negotiating.
"I saw reports that it's a $100 million dollar fight - no it's not. It can get there, if both guys are really built in America.
"I think the fight is really worth, conservatively... I know my numbers and it does around $40 million dollars or $50 million dollars in profit from the show.
"If we talk about generated, it's totally something different.
"You have pay-per-view companies who take splits of the pay-per-view, you have to pay for arenas, undercards, hotels, flights, doping, everything.
"Let's call it $40 million to be safe. The $12.5m is what 31 or 32% [of the 40 million], that's more than fair," Hearn told BoxingScene.com.
Hearn contunued: "He doesn't deserve more than that in my opinion. And people say we gave Joseph Parker 33% - we didn't and I don't know where that number came from.
"The offer to Deonay Wilder will be twice as much as what Joseph Parker made in the fight. Wilder has been offered five to six times his highest purse to fight Anthony Joshua. Anthony Joshua won't even make anywhere near double his highest purse.”
Wilder said he would accept a 40 percent split with a return leg as part of the clause, and despite this compromise, Hearn feels the American is not deserving of a higher offer due to his previous fight purses and significantly lower viewing numbers compared to AJ.
He said: "I feel that we're getting penalised because somebody has done a sh*t job with Deontay Wilder. You have a guy who is making $2 to 2.5 million a fight and people are like 'he deserves $25 million.
“Why? On what basis? He has no profile. He can't sell 10,000 tickets when he fights in a great fight in America. And we have a guy who is making all of this money, and can continue doing so, in risk free fights.
"People don't understand the simple economics and the reality of the situation. One guy is earning $2.5 million dollars and the other is earning ten times as much. Joshua has overpaid his opponents. He overpaid Charles Martin, he overpaid Dillian Whyte, he overpaid Breazeale, he overpaid Takam, he overpaid Parker. We ain't doing it again. We're not going to overpay Deontay Wilder for this fight.
"We want this fight, but does that mean that we're going to roll over and let you play with our balls while we give Deontay Wilder something he doesn't deserve - no."
Will Joshua and Wilder meet by the end of 2018?