Floyd Mayweather Jr. could not be any clearer about the opponent he wants to fight on May 5 at the MGM Grand in Las Vegas.

Mayweather wants Manny Pacquiao -- at least, if you are to believe his tweets on Tuesday afternoon.

Several hours after tweeting a photo of a betting slip from a Las Vegas casino for a $400,000 win on Monday night's Allstate BCS Championship Game, Mayweather sent out two tweets calling out and antagonizing Pacquiao.

"Manny Pacquiao I'm calling you out let's fight May 5th and give the world what they want to see," read Mayweather's first tweet.

One minute later, Mayweather followed with this: "My Jail Sentence was pushed back because the date was locked in. Step up Punk."

Pacquiao's promoter, Top Rank's Bob Arum, told The Los Angeles Times that Pacquiao will fight Mayweather, but not on May 5.

"June 9 is perfect," Arum told The Times from The Philippines where he is meeting with Pacquiao to talk about his next opponent. "May 5 is out, that's impossible."

Mayweather's upcoming jail sentence however, complicates the issue.

Mayweather was due to report to the Clark County Detention Center in Las Vegas last Friday to begin an 87-day sentence. He pleaded guilty to a reduced battery domestic violence charge and no contest to two harassment charges, stemming from a hair-pulling, punching and arm-twisting argument with his ex-girlfriend in front of two of their children.

However, Mayweather's attorney successfully argued that the sentence should be delayed until June 1 so he could fulfill a contractual obligation for a fight at the MGM Grand, which he estimated would pour more than $100 million into the ailing Las Vegas economy.

Arum told The Times that he would be "willing to chip in for lawyers' fees" to get Mayweather's report date moved to allow the fight to happen on June 9.

Leonard Ellerbe, one of Mayweather's advisers, told ESPN.com that Mayweather was serious about calling out Pacquiao.

"You heard him," Ellerbe said, noting that Mayweather is personally responsible for the content of the tweets sent from his verified account.

So Mayweather is now free until June 1 and intends to fight May 5. However, he is without a dance partner.