By Edward Chaykovsky

Recently retired Floyd Mayweather Jr. was on the receiving-end of a scathing open letter from Golden Boy Promotions President Oscar De La Hoya , who criticized the unbeaten fighter's career in the most recent edition of Playboy.

Golden Boy had co-promoted the majority of Mayweather's fights since 2007 - when De La Hoya and Mayweather traded punches in a fight that generated a record-breaking 2.4 million pay-per-view buys. The record stood until May 2nd of this year, when Mayweather's fight with Manny Pacquiao exploded with 4.6 million buys on pay-per-view.

During their business relationship, Mayweather was mostly in contact with former Golden Boy CEO Richard Schaefer. There was friction between Mayweather and De La Hoya for the bulk of their run together. Schaefer left Golden Boy last June and Mayweather cut his business ties with De La Hoya by the end of the year.

"I mean, this is the same guy, I'm so boring, but he fed all his fighters to me," Mayweather said to David Mayo of Mlive.com . "So it's obvious he did it because it was all about the money for him."

"I think he's jealous -- jealous. The thing is this, I mean, you see Richard Schaefer is gone. Richard Schaefer built Golden Boy. Honestly, who wants to do business with Oscar De La Hoya? I really care about a fighter's well-being. I'm just saying if Miguel Cotto was my fighter, if Canelo was my fighter, they'd be a lot bigger than they are now."

Mayweather also took aim at De La Hoya's recent comments on Saul "Canelo" Alvarez. Back in September 2013, Mayweather won an easy twelve round decision over Canelo. In several interviews, De La Hoya said Canelo (23 at the time) was too young and inexperienced for such a fight.  

Mayweather was critical of that statement and also rehashed De La Hoya's inability to support Canelo during that fight week, because former six division world champion entered rehab a few days earlier to treat a relapse with substance abuse.

"From what I hear, he said Canelo was too young," Mayweather said. "Well, that shows you how he does bad business by putting a kid that's too young in there. Genaro, may he rest in peace, Genaro Hernandez (Mayweather's first championship opponent in 1998) wasn't too old for me (Mayweather was 21, Hernandez 32). You want the big reward, you've got to take risk. That's what we do."

"I'm just saying how can Oscar even speak on something when he didn't even show up? He didn't show up at the Canelo fight. What are we talking about? Drugs, lies and adultery. And dressing in drag. Me, as a fighter, I'm just saying, if I was a young fighter coming up, a guy that's lying, a guy that's on drugs, a guy that we don't know if he's going to show up, he's not 100 percent, I've only got to say one thing -- he couldn't be my promoter. If I was a young fighter coming up, I would not want Oscar De La Hoya as my promoter. Me, as a fighter, I couldn't trust him."

Canelo will return this Saturday night, and De La Hoya has been front and center during the entire promotion, as the superstar of his stable will face Miguel Cotto in a WBC middleweight title fight from the Mandalay Bay in Las Vegas. There is a catch-weight in place of 155-pounds.