Unbeaten Floyd Mayweather clinched the IBF welterweight title with a unanimous 12-round decision over Zab Judah.
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Mayweather improved to a 35-0 record, cementing his reputation as the best pound-for-pound boxer in the world.
However, the fight was overshadowed by an ugly fracas in the 10th round after Judah had landed with a low blow.
Mayweather's trainer and uncle Roger was expelled from his corner after climbing into the ring and allegedly attempting to choke the champion.
After Roger Mayweather's intervention, Judah's cornermen, including Zab's father Noel, charged into the ring and a riot nearly ensued.
Security and police officers surrounded the ring as fans threw beer and food and some had their hands poised close to their guns.
After several minutes, order was restored and Mayweather cruised to an easy points victory, the judges scoring the fight 119-109, 116-112 and 117-111.
Afterwards, Mayweather stopped short of calling the low blow intentional.
"I don't want to say anything bad about Zab," said Mayweather, who has now won world titles in four weight divisions.
"It was a good fight. I respect Zab Judah, I respect his camp and tonight he made me respect the fight game.
"Roger said early in the week, if he (Judah) did something dirty he was going to go in the ring and confront him."
Judah, who's record now stands at 34-4, insisted the blow was an accident.
"I'm not a dirty fighter. I was aiming at the body. When I did that Roger jumped in and the trainer took a swing at me."
The Nevada Athletic Commission will hold a meeting on Thursday to decide what action is to be taken.
The Commission is withholding the purses of both fighters and both fighters could be fined. Roger Mayweather could have his license revoked.
Meanwhile, Judah's promoter Don King said Mayweather should have been disqualified because of the actions of his trainer.
"In any commission in the world, that's a disqualification," said King. "The fighter had a third man in the ring. It should be a total disqualification."
On the undercard in Las Vegas, the undefeated Juan Diaz retained his WBA lightweight crown with a 12-round unanimous decision over Jose Miguel Cotto.
And interim WBC flyweight champ Jorge Arce, of Mexico, knocked out Nicaragua's Rosendo Alvarez in the sixth round.