By Rick Reeno

Rapper turned promoter Curtis "50 Cent" Jackson advised BoxingScene.com that Yuriorkis Gamboa's beef with Floyd Mayweather Jr. is legit.

A few months back, 50 Cent and Mayweather were discussing a promotional venture under the banner of TMT Promotions. After a financial disagreement regarding the venture, the former best friends went their separate ways.

During a recent war of words on Twitter, 50 Cent warned Mayweather that Gamboa was very angry with him and wanted to settle their dispute in the ring.

Gamboa was one of the fighters that 50 Cent signed to TMT Promotions. In order to get that done, 50 Cent purchased Gamboa's contract, from Top Rank, for $1.2 million dollars.

After Mayweather finished a brief jail sentence for a domestic abuse charge, he expressed little to no interest in the TMT venture. 50 Cent moved forward and changed the company name to SMS Promotions.

Gamboa returns this Saturday night at the MGM Grand in Las Vegas. He faces Michael Farenas as part of the Manny Pacuqiao-Juan Manuel Marquez HBO pay-per-view undercard.

"He's upset with Floyd's choice not to invest [in the promotional venture] after helping him into this actual situation. The initial conversations were between Floyd and Gamboa. I came at the tail-end, when Floyd was actually going to jail. Because with Floyd going to jail, who was going to provide the finances to actually make the release [from Top Rank]? I actually took care of it while he was gone and it turned into something between me and Gamboa. And then he calls and doesn't want the cutman to work with [Gamboa]. He doesn't want Rafael [Garcia] to work with him," 50 Cent said.