MANILA, Philippines – Unbeaten boxer Floyd Mayweather Jr. has once again accused Filipino ring icon Manny "Pacman" Pacquiao of using performance-enhancing drugs (PEDs) to bolster his performance inside the boxing ring.
During a press conference in Las Vegas, Mayweather said it was "basic common sense" to see that Pacquiao's rise through boxing's weight divisions could not be natural.
"All I'm doing is just asking a question. Come on, it's basic common sense now... Go back and look at the pictures. His head is small and then all of a sudden his head just grew? Come on man, stop this," Mayweather said, as quoted by Boxing Scene.
"Go back and look at the pictures and tell me this man's head didn't get bigger. You're going to tell me this (expletive) is all natural. Come on man, stop," he added.
Mayweather once again questioned where Pacquiao was during the late 1990s.
"Where was Manny Pacquiao at '96? He was a pro before me. Where was he in ’97? Where was he in '98? Where was he all these years?" he asked. "Guess what, it took me years to get here. It took me years to get here."
Mayweather acknowledged that he has also moved up in weight during his career, but not to the extent that Pacquiao did.
"I'm going up in weight, but I'm not just walking through no damn fighters," he said. "This (expletive) was at 106-pounds (when he started), and he's just walking through (Miguel) Cotto. And Cotto can’t knock down (Shane) Mosley but he can? Come on, man."
Mayweather began his career at the 130-pound weight division but has campaigned mostly at welterwight in recent years. He will fight at junior middleweight (154-pounds) this Saturday against Miguel Cotto.
Pacquiao has filed a defamation suit against Mayweather, claiming that his image was tarnished because of the American boxer's allegations that he used PEDs.
Mayweather also railed against the media in the United States for not supporting him in his quest to have more stringent drug testing in boxing.
"These are the American people who don't stand behind me. They stand behind these foreigners," Mayweather said, adding that he gets more "love" in the United Kingdom.
"When my career is over, you're going to move on to the next and write about the next (expletive). That's exactly what is going to happen," he said.
A potential mega-fight between Pacquiao and Mayweather was scrapped in 2009 when the Filipino boxer refused to agree to Mayweather's demands of random urine and blood testing.
Pacquiao has since agreed to the drug test, but negotiations for the mega-fight fell apart again earlier this year after the two camps failed to agree on the split of pay-per-view revenue.