McGregor backs up boasts with demolition of Alvarez

Conor McGregor raised his arms in triumph before he stepped inside the cage, the cocky Irishman playing to a crowd going wild for UFC's greatest champion.

McGregor ran a circle around the mat, a victory lap of sorts before he even threw a punch. He packed fans to the Madison Square Garden rafters and drove them into a frenzy as he packed a vicious punch against Eddie Alvarez.

The boastful McGregor used a brash and brilliant performance to knock out the overwhelmed Alvarez in the second round to win the Ultimate Fight Championship lightweight title on Saturday in the main event of UFC 205.

He dubbed himself the King of New York before the fight. Now he's been crowned a two-class champ.

The easy answer: Whatever he wants.

McGregor dominated from the opening bell of the biggest card in UFC history - on pace to set an MMA pay-per-view record - and the sold-out crowd of 20,427 loaded with A-listers from Madonna to Hugh Jackman went wild with each punishing blow.

McGregor, also UFC's featherweight champ following a 13-second knockout of Jose Aldo, had predicted a fourth-round KO.

Unlike UFC's laborious legal fight to reach New York, McGregor wouldn't make anyone wait.

UFC has not decided if McGregor (21-3) will be allowed to defend both championships.

UFC president Dana White said McGregor could be about the only fighter in the promotion to handle that kind of grueling fight load.

"Who knows?" White said. "I'm going to let him enjoy his night."

McGregor crouched inside the cage waiting for the bell to ring and attack Alvarez (28-5).

McGregor was the clear aggressor from the start, dropping Alvarez three times in the first round.

Alvarez, of Philadelphia, bounced up the first two times and took a severe beating on the third.

McGregor forced Alvarez to fight with his back to the cage and never absorbed a serious strike.

The 28-year-old McGregor put his hands behind his back in the second, taunting and toying Alvarez to hit him.

McGregor, UFC's biggest box-office star, unloaded a left and ended the fight at 1:52 of the second.

McGregor lay waste to a battered Alvarez and brazenly demanded his second UFC championship belt in a speech peppered with profanities.

"I was literally losing my head in there," he said.

McGregor snatched his new lightweight championship belt, paired it with his featherweight title, and UFC's first two-class champion in the promotion's history plopped himself on top of the cage and absorbed the scene of his historic night.

"I've spent a lot of time slaying everybody in the company," McGregor said.