Amir Khan has embarked on the toughest training of his career to beat Lamont Peterson in their rematch on May 19. The 25-year-old Briton aims to avenge his controversial loss to the American when they meet in Las Vegas. Peterson will defend the IBF and WBA light-welterweight titles that he took from Khan in Washington last December.

"I believe I won the first fight. I want those titles back," Khan said. "This fight means so much to me. It's going to be explosive."

He is already into his “longest and most motivated training” and has started workouts in England. He also plans to do high-altitude training in the Philippines and spend weeks at the Hollywood gym of trainer Freddie Roach.

"I like the attitude," Roach said. "He has already been training for a month in England. Physically I think Lamont took more punishment last time. That's why I think we will have an easier time."

Once a homeless youth on the streets of Washington, Peterson (30-1-1, 15KOs) completed a fairytale with a split-decision triumph over Khan in a fight marred by referee Joe Cooper taking points away from Khan in the seventh and twelfth rounds. Peterson, 28, won 113-112 on two scorecards. The other judge had Khan a 115-110 winner. Without the deductions, Khan would have kept the titles.

"People still say I'm the champ," Khan said. "At no time has Lamont said he won the first fight. It's all about how you come back from these fights and I always come back stronger.

"His head kept coming in there. We're not going to be dealing with that problem now because I'm going to be hitting him. I'm not going to make the same mistakes. When he comes inside, instead of pushing him away, I can take a sidestep back.”

"There aren't that many British world champions and I'm going to be one again. I'm going to be ready for everything he brings to the table. I just want there to be no doubt I won that fight. I want to go out and prove I'm the better fighter. I will definitely leave no doubt come May 19."

Khan, who stands at 26-2, with 18 knockouts, wants to forget the controversies about Cooper's calls and the handling of the scorecards during and after the first fight.

"I haven't got to the bottom of it and I don't want to. I want to put it all behind me," Khan said. "I just want to win the next fight. I just want a fair fight and I promise 100% that I will win."

Roach is working on strategy adjustments after seeing more attacks than expected from Peterson.

"Lamont fought more aggressively than I have ever seen him fight," Roach said. "If he does that again, we will be ready to deal with that.".

Tags: Amir Khan , Freddie Roach , Khan vs Peterson , Khan-Peterson , Lamont Peterson