By Robert Morales

Robert "The Ghost" Guerrero has never been one of those fighters who calls out everyone and his brother. But he has made some changes of late and is hopeful they lead to the really big fights with guys like Floyd Mayweather Jr. and/or Manny Pacquiao.

The first thing Guerrero did was somewhat stunningly move from the 135-pound lightweight division to the 147-pound welterweight division and bypass the 140-pound junior welterweight class. That's not something that often happens.

Considering Guerrero won his first world title at the 126-pound featherweight division, that made the move even more bold.

"Oh, yeah, Mayweather's always looking for that next big fight and what's better than to have two guys like (Andre) Berto and myself put up a great fight right before the year ends and then the beginning of next year, it's there," said Guerrero, who tonight will defend his title against Berto in the main event at Citizens Business Bank Arena in Ontario (on HBO). "It's possible. Everything is possible.

A win over Berto could go a long way toward getting Guerrero something big. Berto is no joke, as the saying goes. He won a welterweight world title in June 2008 and defended it five times before losing it to Victor Ortiz in an April 2011 slug-fest during which both fighters hit the canvas twice.

But knowing how hard-hitting and vicious that Ortiz-Berto fight was, one has to wonder if Guerrero can handle a fight like that at this weight class. He is not a natural welterweight, and just because he beat Aydin doesn't mean he is ready for Berto (28-1, 22 KOs), who is favored to win.

Then there is Guerrero's punching power at 147. Berto, who gives Guerrero (30-1-1, 18 KOs) respect, questions that.

First, he gave this response when asked if he believes Guerrero is a legitimate welterweight: "He is at 147, so he's a legitimate welterweight."

But can he hurt you?

"Like I said, at the end of the day, man, this is boxing," Berto said. "At any time, any right punch can land at any right time that can hurt a fighter that you wouldn't even expect. So right now, me personally, no, I don't think he can."

Guerrero, a southpaw, is unfazed by anyone not convinced he can hang with the best in this weight class.