WBC Heavyweight champion Deontay Wilder accused boxing promoter Eddie Hearn of exploiting poster boy Anthony Joshua during an astonishing outburst in New York.
Wilder puts his title on the line in Brooklyn's Barclays Center on Saturday night against dangerous Cuban southpaw Luis Ortiz in what is the biggest test of his 39-fight career.
The 32-year-old American hopes victory over Ortiz will help set up a lucrative unification clash against Joshua, the WBA and IBF champion, this summer but chose to take aim at Hearn during Thursday's press conference in Manhattan.
Deontay Wilder attacked boxing promoter Eddie Hearn over his handling of Anthony Joshua
'Eddie Hearn is just another white man milking a black man, that's all it is,' Wilder said.
'It's easy. It's about time for somebody to say it and come out with it and I don't care who hears it. I don't hold my voice and I don't have any filters, I speak what I think.
'Joshua has been letting him do it because if Joshua really wanted this fight he knows how to make it happen. Give the fans what they want to see.'
Hearn has been locked in negotiations with Wilder's team about a clash later this year but the two sides have been at loggerheads over purse splits. Wilder believes he is worth at least 50 per cent of any split while Hearn is adamant Joshua, one of the biggest names in the sport, deserves more than half.
Now the Alabama native says he will do his bit to make the fight happen, by agreeing to face Londoner Joshua, who takes on Joseph Parker in Cardiff on March 31, 'in his own back yard'.
'I already did you a favour by fighting Luis Ortiz because you ducked him,' Wilder told Joshua.
'You don't have to worry about him anymore. You know I'm ready