By Miguel Rivera

WBC welterweight champion Floyd Mayweather Jr. (43-0, 26KOs) has managed to stay at 148-pounds for the last month, as he preapres for Saturday's fight with Robert "The Ghost' Guerrero (31-1-1, 18KOs) at the MGM Grand in Las Vegas.

Mayweather says he made a career decision a few years ago to start fighting at his walking weight, which is around 150-pounds. Because of his great metabolism and the countless hours of work that he generates in the gym, Mayweather is able to eat just about anything without worrying about weight gain.

"At one time I realized that I have the skills and the sharp mind to still beat these guys [at the higher weights]. So why would I hurt myself just to get down in weight and then go up another 20-pounds [overnight] or blow up another 30-pounds. I've been able to handle big guys my whole life. Like I said before, I don't really feel like [making weight will be a problem in my career]. I'm able to eat four times a day, five times a day. My metabolism burns it right off," Mayweather said.

"Like today, I can go eat pizza and I can go eat Big Macs but what you have to realize is that I work harder than any other fighter. When we're at the boxing gym, we don't have a bell. You don't hear a bell. When we box and we spar, we try to get the toughest competition, the roughest competition."