MANILA, Philippines – Undefeated American fighter Floyd Mayweather, Jr. has not yet put an end to his doping allegation against 7-division world champion Manny Pacquiao, even mentioning it during the press conference of his May 1 fight against compatriot Shane Mosley.

Mayweather even brought up Mosley’s doping history during the press conference held at the Nokia Theatre in Times Square, New York City.

“I can't say how many fights Shane has won in the past because we know Shane was using enhancement drugs. That's something we do know,” he said as quoted by the Associated Press.

Although Mosley did not react to Mayweather's statement, the boxers still had a minor scuffle during the press conference which prompted their team members to intervene.  

Mosley admitted to taking steroids “unknowingly” in 2003 after being forced by a former strength and conditioning coach to do so as part of his training.

“It's no different than Pacquiao. I offered Pacquiao the fight. I said, ‘We'll give you $25 million.’ I never met a man who wouldn't take a $25 million drug test,” continued Mayweather.

He was slated to fight Pacquiao on March 13 at the MGM Grand Garden Arena in Las Vegas, Nevada but negotiations crumbled because they disagreed on the drug testing protocol.

Pacquiao even sued Mayweather and some of his team members for alleging that he was taking performance-enhancing drugs. The Filipino boxing superstar chose to fight Ghanaian Joshua Clottey on March 13 at the Cowboys Stadium in Arlington, Texas.

Mosley, on the other hand, was supposed to face Andre Berto in January but the Haitian’s family was affected by the devastating earthquake in the Caribbean nation.

Mayweather and Mosley have agreed to undergo random blood testing to ensure fairness ahead of their bout dubbed “Who R U Picking?”

Unknown outcome

Golden Boy Promotions CEO Richard Schaefer explained the title of the May 1 pay-per-view event.

“The theme of this fight is ‘who are you picking?’ because when two champions of this caliber meet in the ring, you can expect nothing but an extremely competitive fight and an unknown outcome that will only reveal itself on May 1,” Schaefer said in a statement posted on PhilBoxing.com.

“Shane Mosley is one of the greatest fighters of this era and so is Floyd Mayweather, so it is a true gift that the fans will have the opportunity to see a fiercely competitive and fantastic night of boxing,” he added.

Mayweather has a 40-0 (with 25 knockouts) record while reigning World Boxing Association (WBA) welterweight super champion Mosley has 46 wins (with 39 KOs) and 5 losses.

The undefeated American said of his foe: “Not only does he have the skills, but he is also fast, strong and a very tough competitor. His speed and power won't mean much that night against my will and determination to dominate him inside the square circle. When I compete against the best, I am always at my best; so on May 1 the fans will see one great performance.”

Mosley, for his part, noted that his dream of fighting Mayweather is finally coming true.

“Floyd is excellent at what he does, but my past record of beating the best competition and other great champions shows that he is just another one of my opponents I intend to beat. He has never faced anyone like me before and I think that will be a big factor on May 1 when I plan to show him just what it means to meet a true champion in the ring.”

TheSweetScience.com also reported that Schaefer predicted that the Mayweather-Mosley bout would generate 3 million buys. This is higher than the 2.7 million PPV buys record held by the 2007 fight between Mayweather and Oscar de la Hoya.