Unified junior welterweight titlist Lamont Peterson and former titleholder Amir Khan will meet in a rematch at Mandalay Bay in Las Vegas on May 19, a little more than five months to the day after their all-action first fight went down as one of the most controversial bouts of 2011.

"Everyone is very pleased that this is Lamont's next fight," attorney Jeff Fried, who represents Peterson and Barry Hunter, Peterson's trainer/manager and father figure, told ESPN.com on Thursday after the deal had been signed. "It was challenging for a variety of reasons, including some of the post-fight antics undertaken by Khan. But at the end of the day, Lamont and Barry had a singular focus on what is in the best interest in Lamont Peterson and his family, and that is what drove this deal getting done."

England's Khan (26-2, 18 KOs) came to Peterson's native Washington, D.C., to defend his belts Dec. 10 and lost a split decision in a fight filled with great action but marred by questionable officiating, issues over the scorecards and an unauthorized figure at ringside.

"Both sides are signed, but this has been one of the most difficult negotiations I have had for any fight I have ever been involved with," said Golden Boy promoter Richard Schaefer, who has negotiated dozens of major fights. "There was a lot of back and forth, but it all ended good in getting this fight done. I think it's one of the most anticipated rematches. It's the right fight for Lamont and the right fight for Amir, and I'm really excited both parties agreed to do this fight."

Peterson accepted the deal from Golden Boy, which handles Khan, for the rematch even though Top Rank's Bob Arum had been wooing Peterson, a promotional free agent, for a fight with Juan Manuel Marquez, which he hoped to put on at Cowboys Stadium in Arlington, Texas.

Peterson, who earned $650,000 for the first fight and rejected a $1 million offer for the rematch shortly after the first fight, will make "substantially more than $1 million," Fried said, although he did not divulge the terms.

Khan, who has a contract with HBO in the United States and Sky in England, brings substantial money to the fight but wanted the rematch so badly that he gave 50 percent of the worldwide revenue that the fight will generate to Peterson.

"We offered 50-50 because that was how much Amir wanted this fight," Schaefer said. "There were times where it looked like we were close to getting it done, but it was a drawn out process. But in the end it was not a sanctioning organization, a TV network, the media or fans who made this rematch. It's the fighters who wanted to get the fight done. It was Lamont Peterson saying he didn't want to fight anybody else except Amir Khan and it was Amir Khan saying he wanted to fight only Lamont Peterson. That is what makes fights.

"The truth is both fighters had other options. But it really came down to what they wanted most. For both guys, other options might have been more lucrative, but it was not really only about the money. They realized the right thing to do was to fight each other again."

The refereeing was the most controversial aspect of the December fight. Khan had two points deducted for pushing -- an almost unheard of foul call -- in the seventh and 12th rounds by Washington-area referee Joe Cooper. Without the deductions, Khan would have retained the belts via unanimous decision.

Khan complained that while he was docked points for pushing, Peterson (30-1-1, 15 KOs) was never warned for leading with his head. Golden Boy also raised questions about judge George Hill's scoring of the seventh round, which appeared to read 10-10 but was crossed out to read 10-8 in Peterson's favor.

Then there was the much-publicized issue of the so-called ringside "mystery man," who turned out to be Mustafa Ameen, who is affiliated with the IBF and had a credential arranged as a courtesy from the organization, but was not at the fight in an official capacity. However, he was seen on video at ringside apparently touching the scoring slips, which is against the rules, and distracting a judge. He was later seen in the ring apparently celebrating with the Peterson team after the fight.

It all led to Khan protesting the decision to the sanctioning bodies and harsh words were exchanged between the camps. But now all of that should only add to the interest surrounding the rematch, which will headline HBO's "World Championship Boxing."

"May the better man win," Schaefer said. "It will be one of the most talked-about fights of the year. This is one of those fights people wanted to see and I am happy we can deliver it to the fight fans. I will say this, Jeff Fried deserves a lot of credit for helping us get this done."

Schaefer said he is close to finalizing the co-featured bout for the card, which would also take place in the 140-pound division: Lucas Matthysse (29-2, 27 KOs), the hard punching contender from Argentina, against former lightweight titleholder Humberto Soto (57-7-2, 34 KOs) of Mexico, who is now fighting as a junior welterweight.

"I am almost done with that fight and HBO is licking their chops on this fight," Schaefer said. "Those two fights as a doubleheader is probably the best 1-2 punch HBO boxing has delivered in a long time."

Dan Rafael is the boxing writer for ESPN.com.