WBA/IBF 140-pound champion Lamont Peterson (L) poses for photographs with British starAmir Khan after a press conference in London. Khan on Tuesday vowed to learn from his mistakes when he faces Peterson in their keenly anticipated world title rematch on May 19th at the Mandalay Bay in Las Vegas. Khan cried foul after losing a split decision to Peterson in their see-saw battle for the WBA and IBF lightwelterweight titles in Washington in December, insisting he had been the victim of dubious scoring.