Mosley: I will retire Mayweather

On May 1, at the MGM Grand Hotel in Las Vegas, unbeaten

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"is going to be the hardest fight that he has ever had in his life."

"Everybody else Floyd has been 135 pounds or at around 140. He's not fought any real 147 pounders, other than Oscar de la Hoya, who gave him a lot of trouble," said

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, from his training camp in the mountains of Big Bear Lake, Calif., on Tuesday.

"Right now, my weight is great. I'm probably weighing around 152-ish when I leave the gym. I look at Floyd as a natural welterweight -- a real 147-pounder. In fact,

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is the biggest guy that he's fought that was a big welterweight, and Oscar did well against him," said Mosley, who will face Mayweather live on HBO pay per view.

"I'm pretty sure that Floyd will feel more power in this fight that he will have ever had to feel," said Mosley. "And if I can get that knockout, if I get that one shot, and if I can get him hurt, then I'm going to be all over him."

That's how confident the 38-year-old Mosley (46-5, 39 knockouts) was feeling about defending his WBA welterweight (147 pounds) title against the 33-year-old, unbeaten Mayweather (40-0, 25 KOs) after having showered up following a morning workout just priot to shaking out with trainer,

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.

"I was 38-0 with 35 knockouts when I stepped into the ring and lost for the very first time, wo when you say 40-0, that doesn't mean a thing to me," said Mosley, referring to a January, 2006, unanimous decision to the late

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.

"All that it means is that I'll be the one giving him his first loss," said Mosley. "No disrespect, but I really don't think he's been in there with a fighter like me. I believe that when I beat Floyd, I will send him into retirement. May 1 will be Mayweather's first loss."

Mosley has owned a home in Big Bear since 2000, and has trained there since 1996.

"I've been training in Big Bear, now, for the last 10 years, so this would be my spot. I've been sparring, I've been working with Brother Naazim on different things, strategies and stuff on how to approach the fight," said Mosley.

"I've been doing nine to 12 rounds. Usually, I can do 12 at the beginning of camp, because, basically, I'm always pretty much in shape. Today, I did a little bit of running, and I kind of shook out a little bit," said Mosley. "I had a pretty good session with Brother Naazim today for, like, hitting mits and stuff like that. I probably won't spar today. I don't spar everyday."

But when Mosley has sparred, lately, it has been with a versatile group such as 24-year-old, junior welterweight (140 pounds)

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(7-0, three KOs), of Philadelphia.

Another goer has been 29-year-old Enrique Ornelas (29-6, 19 KOs), a durable fighter who has gone at middleweight (160 pounds), supermiddleweight (168 poounds), and, even at light heavyweight (175 pounds), and, whom Mosley calls, "a big body to punch on."

"We've got a couple of guys coming in there for speed. We're doing a couple of things, and we're getting him a few different looks. Dargan imitates Mayweather really well, but nobody actually fights like Mayweather. If they did, they'd be in their own camps getting ready to defend their belts," said Richardson, who also trains legendary middleweight and light heavyweight king,

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.

"We're trying to get Shane in the best shape that we can, and if we get the best Shane Mosley, that should be enough to carry out our best plan," said Richardson. "Right now, I feel like Shane's really adopting what we're trying to get into, and he's so confident that I think we'll be in good shape."

Mosley believes that he is ready for anything that Mayweather has to offer.

"I expect him to expect him to fight in the center for a little while and to see what he can do with that, and I expect him to fight off of the ropes a little bit. I expect him to do whatever he can to try to disrupt and upset my rhythm," said Mosley.

"For a while, I think that we're both going to be playing the same game, but if I have an advantage of outboxing him, then I'll outbox him," said Mosley. "If I have an advantage of being stronger than him, then I'll use that. Whatever is at my advantage, I'll do."