By Ryan Burton

Eight time world champion Floyd Mayweather Jr. (43-0, 26KOs) recently announced that he will be facing Robert Guerrero on May 4th at the MGM Grand in Las Vegas. During a recent interview with BoxingScene.com and other media outlets, Mayweather spoke about random drug testing in boxing, a movement that he has helped spearhead.

Several years ago, Mayweather and career rival Manny Pacquiao were very close to finalizing a deal to fight each other. The deal fell apart because Pacquiao refused to agree to Mayweather's demand for both fighters to undergo several weeks of random Olympic-style drug testing.

Even before Pacquiao was knocked out in six rounds by Juan Manuel Marquez last December, members of the Filipino boxer's team were questioned whether Marquez's newfound muscular physique was "natural." Further questions were raised when Marquez appeared to be stronger than Pacquiao in their fourth meeting, and to close the show he knocked Pacquiao out cold with a single punch.

If there was a random drug testing protocol involved, says Mayweather, there wouldn't be any doubts.

"I don't think people are really giving me the credit that I am due. I am the pioneer that is in sports that said that we need to take random blood and urine testing. Once Pacquiao got knocked out, after the fight, from what I heard, I don't really know, he was talking about that Marquez was on something. I guess things happened and you live and you learn," Mayweather stated.

Mayweather was also asked if a fight against Pacquiao is still feasible after the Filipino suffered a brutal knockout, but he isn't sure how Pacquiao will return after suffering such a setback.

"You know he took a crucial knockout. He took a crucial knockout," Mayweather said and also pointed out that one fight won't make or break his legacy in the sport. "Like I've said before, Floyd Mayweather is not scared of nobody. You don't just wake up overnight and become pound for pound. Sometimes people want to talk about my legacy. My legacy is not based on one fight. If it was then I wouldn't have needed to fight 43 fights. I could have just fought one fight and they could have put me in the Hall of Fame as the best fighter who ever lived. The thing is this, all I want is to fight on an even playing field. I am not picking on one opponent. I don't just want to clean up boxing, I want to clean up all sports," he continued.

Send questions or comments to ringsidewriter@gmail.com Follow Ryan on Twitter @ringsidewriter and tune in to The Boxing Lab, BoxingScene's official audio on Tuesdays. The show is hosted by Ernie Gabion, Luis Sandoval and Ryan Burton