Robert Guerrero

Robert Guerrero poses at Westside Boxing Club in Los Angeles, Monday, Nov. 19, 2012. Guerrero is scheduled to fight Andre Berto for Guerrero's WBC interim welterweight title in a boxing bout Saturday in Ontario, Calif. (AP Photo/Damian Dovarganes) (AP Photo)

Robert "The Ghost" Guerrero may be a 10 to 1 underdog, but he believes he will be the first man ever to beat Floyd Mayweather Jr. when they meet on May 4th.

Mayweather is 46-0-0 which is the best pound-for-pound fighter in the world. But he is 36 now, spent a couple of months in jail and is coming off a long layoff.

Mayweather says he is taking Guerrero seriously.

"I had a chance to see Robert for the first time face Andre Berto. He's a good young fighter, he's good young fighter and I believe we'll give the fans what they want to see," said Mayweather.

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