By Jose Luis Camarillo, Miguel Rivera, Notifight.com

WBC 154-pound champion Saul "Canelo' Alvarez (41-0-1, 30KOs) will refuse to fight on the May 4th undercard at the MGM Grand in Las Vegas - unless Floyd Mayweather Jr. signs an agreement that guarantees the Mexican champion a showdown in September. The May date in Las Vegas was going to be a Showtime pay-per-view doubleheader, with Mayweather in the main event against Robert Guerrerro and Canelo facing WBA champion Austin Trout in a unification in the co-feature.

Canel and his manager/trainer Chepo Reynoso are giving Mayweather a Thursday deadline to agree, or the Mexican boxer plans to fight on April 20th in Mexico or May 11th in the United States. And the opponent is potentially not going to be Trout, says Canelo.

"We are going to arrive to Los Angeles this Thursday. If on that day Floyd does not signed our agreement for September, we are not going to fight on the evening of May 4th, and then we will determine if we'll fight on April 20th or the week that follows the May 4th date. I don't know why we're being put in this position. Two years ago they wanted to make this the fight, but I was not ready. Today we want the fight and they are not agreeing.  I do not understand. All I want is a big opponent, because 2013 will be my year. We want to continue with our plan to have the big fights that the public wants," Canelo said.

Reynoso added in the following: "Let it be clear that it is Mayweather who does not want the fight."