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DMX wants to get into the boxing ring and prove to everyone that he’s still a tough guy, but there was a serious catch — he’ll only do it if the promoters can somehow MAKE the other guy lose … anyone smell a fix?!

It’s all over an upcoming celebrity fight in Alabama — X signed on to fight some wannabe actor named Eric Martinez. But after he agreed to a 3-round fight, DMX had a few demands …

X’s manager, Nakia Walker, submitted an addendum to the rapper’s original contract for the fight, stipulating: “Event Promoter and Management agree that [DMX] is scheduled to win Boxing Challenge.”

Walker also added a line which read, “All parties agree this event has been scheduled to occur only in fun and that the artist involved is not a professional boxer.”

The fight promoters, Thunder Promotions, refused to sign the addendum — claiming they never agreed to fix anything. Now, DMX is threatening to back out and the promoters are looking for someone to replace the rapper while they also prepare a lawsuit for breach of contract.

DMX’s rep tells us the ra