Guerrero believes in southpaw jinx

LAS VEGAS -- Those who give Robert Guerrero a good chance to upset pound-for-pound king Floyd Mayweather Jr. and take his welterweight world title on Saturday night (9 ET, Showtime PPV) at the MGM Grand point to specific aspects of the matchup.

They look at the age and recent results, for one. Guerrero is an in-his-prime 30 and is coming off perhaps the best performance of his career when he beat down former two-time welterweight titlist Andre Berto in November. Meanwhile, Mayweather is 36, has been out of the ring for one year -- two months of which was spent in jail last summer -- and is coming off a win against Miguel Cotto in which he was hit cleanly more than he ever has been.

Another aspect is their stance. Guerrero is a southpaw and on the rare occasions where Mayweather has had a few issues in his past fights, some have come against left-handers.

Mayweather beat DeMarcus "Chop Chop" Corley by convincing unanimous decision in a 2004 junior welterweight fight but Corley, a former titleholder, gave him a few problems and also rocked him.

In 2006, Mayweather outpointed Zab Judah to win a welterweight belt, but for the first four or five rounds of that fight Judah completely neutralized Mayweather and was winning easily, mainly because the southpaw style had him out of sorts.

"Oh, definitely the southpaw side gives him trouble," Guerrero said. "If DeMarcus Corley and Zab Judah didn't get tired, they were winning that fight and I believe that. I'm ready for this. I've had the right fights. I was built the right way. I've had the right experience.

"I've been there with a bunch of different styles. I've been in there with lefties, a lot of them; I've been in with a bunch of different power punchers, prowlers, boxers, sharp guys. But as I say, what I've been through, God's prepped me up for this and here it is."

When asked about if he has trouble with southpaws, Mayweather brushed it off.

"Last time I checked I was 43-0," Mayweather said. "I don't think he's a better boxer than Zab Judah. He's not faster than Zab Judah. I don't think he faced the competition that Zab Judah has faced.

"But we'll see how the fight plays out. Everybody has a game plan and my game plan is to just adjust and adapt once I get in that squared circle. But once again, everybody got to adjust and adapt to me because I control the tempo always."