Keith Thurman handed Danny Garcia his first loss, winning by split decision to unify the WBC and WBA welterweight titles on Saturday.
Thurman started the better of the pair at the Barclays Center before doing enough to win and improve to 28-0.
A pair of judges scored it 116-112 and 115-113 in favour of Thurman, while a third had it 115-113 Garcia.
"The judges are judges, I thought I outboxed him, I thought it was a clear victory," Thurman said in an in-ring interview.
Thurman was the early aggressor, wobbling Garcia with a left hand to dominate the opening rounds.
As the pace slowed, the crowd grew restless and the duo were booed, with Thurman becoming more defensive.
But Garcia failed to take advantage, giving up his WBC welterweight crown.
"I thought I won the fight, I thought I was the aggressor, but it is what it is," Garcia said after his record slipped to 33-1.