WASHINGTON -- Hometown favorite Lamont Peterson clearly thought he won the fight. Dethroned champion Amir Khan felt he had been cheated.
Peterson, helped by referee Joe Cooper deducting two points from Khan for pushing in the seventh and 12th rounds, scored the split-decision to win the WBA and IBF junior welterweight titles on Saturday night.
Judges George Hall and Valerie Dorsett scored the fight 113-112 in favor of Peterson. Nelson Vasquez had Khan winning 115-110.
"It must have been a good fight. They're already talking about a rematch," Peterson said.
Khan, who was favored to win in his sixth title defense, started out strongly, scoring the only knockdown in the fight late in the first round. In fact, Khan, who complained that Cooper was favoring Peterson, thought he had knocked Peterson down a second time. It was ruled a slip.
"It was like I was against him and the referee," Khan said.
Peterson began his counterattack in the third round -- taking the fight to Khan -- and hitting him with a series of blows to the head, buckling his knee.
The challenger secured the fight by winning the 10th and 11th rounds on Hill and Dorsett's scorecards. The 12th was ruled even after the point was deducted from Khan.
"I was shocked. There was no warning," Khan said about the 12th round point deduction.
"I'm a fighter -- not a referee," Peterson said when asked his opinion on Khan's penalty.
"It's always going to be rough at this level. I'm always prepared for a backyard fight."
In a bizarre post-fight news confererence, fans of both fighters crowded the room, repeatedly cheered and had to be admonished by officials from the promoters.
Oscar De La Hoya, whose Golden Boy Promotions put on the fight, started campaigning for another bout even before both fighters spoke.
"There will be a rematch," De La Hoya predicted.
Spurred on by a crowd just short of a sellout in the first championship fight held in Washington since 1993, Peterson improved to 30-1-1. Khan is 26-2.
"We all know who won the fight," Khan said.
Earlier, heavyweight Seth Mitchell (24-0-1, 18 KOs), a former Michigan State linebacker, improved his chance to fight for a heavyweight title with a second-round TKO of Timur Ibragimov (30-4-1, 16 KOs).