Floyd tweets, but still no answers

Pound-for-pound king Floyd Mayweather Jr. has been silent about his boxing future since he got out of jail after serving a two-month sentence last summer. He has left the talk of his next fight up to adviser Leonard Ellerbe, who announced on Mayweather's behalf in December that he would fight May 4 on pay-per-view (TV company TBA) at the MGM Grand in Las Vegas.

As for the opponent? Ellerbe wouldn't discuss names, but behind the scenes there have been discussions with the two obvious potential opponents, interim welterweight titlist Robert Guerrero and junior middleweight titlist Canelo Alvarez. Guerrero is perceived by most as being the favorite to land the fight.

So while the speculation continues over who Mayweather will face -- and I also happen to think there's an outside shot of a deal with welterweight titlist Timothy Bradley Jr. -- Mayweather finally broke his boxing silence on Wednesday on Twitter, although he didn't offer any answers.

"As of right now I don't know who I'm fighting on May 4th," Mayweather tweeted. "Me fighting Robert Guerrero is just a rumor."

Notice he didn't mention Alvarez or Bradley.