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Mayweather announces Alvarez fight on Twitter

Mayweather and Guerrero at Final News Conference

Steve Marcus

Undefeated WBC welterweight champion Floyd Mayweather Jr. attends a news conference at the MGM Grand Wednesday, May 1, 2013. Mayweather will defend his title against Robert Guerrero at the MGM Grand Garden Arena on Saturday.

Canelo Alvarez Defeats Shane Mosley

WBC super welterweight champion Canelo Alvarez of Mexico prepares to fight Shane Mosley at the MGM Grand Garden Arena Saturday, May 5, 2012. Launch slideshow »

Mayweather Workout

Undefeated welterweight boxer Floyd Mayweather Jr. works out at the Mayweather Boxing Club Wednesday, April 17, 2013. Mayweather will defend his WBC welterweight title against Robert Guerrero at the MGM Grand Garden Arena on May 4. Launch slideshow »

Floyd Mayweather tweeted that he will fight Mexican star Canelo Alvarez on Sept. 14 at the MGM Grand.

"I chose my opponent for September 14th and it's Canelo Alvarez," Mayweather said Wednesday night on Twitter. "I'm giving the fans what they want. It will be at the MGM Grand."

Alvarez sent a tweet in Spanish announcing the fight.

Mayweather is unbeaten in 44 fights, the last a unanimous 12-round decision over Robert Guerrero on May 4 in a welterweight title fight. Alvarez is 42-0-1. He unified the WBC and WBA super welterweight titles April 20 in San Antonio with a unanimous victory over Austin Trout.

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