Musician Soulja Boy has claimed that Chris Brown has withdrawn from their fight.
The two men had disagreed on social networks and later drafted to decide who struggle sharp boxing in Las Vegas.
The fight would be the third round. However, the scheduled date for the battle has not been proclaimed.
Former boxing champion of the world Mike Tyson heavyweight weight was given training and Chris Brown Soulja Boy had been trained by another boxing champion, Floyd Mayweather.
But mwanarapa he announced via Twitter that the battle that had a bid of $ 1m (£ 803,500) will not happen again.
"Manager Chris Brown had called my manager overnight and said that the fight will not happen again and that he will not sign a contract. Do not ask me more."
"Hereafter I ... maybe he was afraid, or maybe there was a reason. I'll just say that he does not want to fight. I can not compelled to sign the contract."
Strife between the two began after Soulja Boy love and offer views images of Karrueche Tran, a former boyfriend Chris Brown, on Facebook.
The two were on Facebook upload video and photos they joke and exchange of threats.
Another Mwanarapa 50 Cent Soulja Boy predicted he would win and said he bet $ 100,000 (£ 80,500).
Mike Tyson announced on social networks that was recorded assaulting Soulja Boy last month but so far have not been released.
Chris Brown, 27, and Soulja Boy, 26, have been widely criticized by fans and other artists to put their bickering publicly.
Counsel Chris Brown Soulja Boy threatened to bring him to court in January.
Soulja Boy has been accused of using the match to increase sales of his songs and fame.
There were also reports that Soulja Boy had begun to be taught by another former champion Evander Holyfield heavyweight, after falling out with Floyd Mayweather.