Conor McGregor tapped out in the fourth round as he lost his lightweight title challenge to Khabib Nurmagomedov.
The Irishman looked to go on the attack early in the first round but soon found himself on the canvas where he was dominated for the remainder of the session.
In the second, McGregor was rocked backwards by Nurmagomedov who then jumped at the chance to take the fight to the floor once again.
The challenger had a better third round as he landed with both hands, but the champion’s chin passed the test.
And if McGregor thought he had a foothold in the fight, he was wrong as Nurmagomeodov executed a rear-naked choke in the fourth round.
McGregor, 30, was returning to the Octagon after a near two-year absence since he stopped Eddie Alvarez win the lightweight title in 2016.
He then took time off after becoming a father to Conor Jr the following May before taking on boxing legend Floyd Mayweather three months later. McGregor was stopped in the 10th round but banked £100million for his efforts.
He then ran into controversy earlier this year when he and his entourage descended on a Brooklyn parking garage and attacked a bus carrying UFC fighters, including Nurmagomedov.
McGregor was arrested and charged before eventually agreeing a plea deal in July that enabled him to continue his career in America.
Shortly after that, his fight with Nurmagomedov was confirmed.
After a slow start to fight week in Sin City, the Irish fans began to arrive in their numbers towards the weekend.
They packed out the weigh-in on Friday when a frustrated McGregor lashed out at his rival, missing with a kick as they squared off on stage.
The Crumlin native was returning to the city that witnessed perhaps his greatest triumph in the sport, his 13-second KO of Jose Aldo to win the featherweight belt almost five years ago.
But he was no match for Khabib, who dominated from the off to maintain his perfect record and defend his lightweight crown.
The Russian dominated the first on the ground and dropped McGregor in the second with a huge overhand right before then taking the fight to the ground once more.
The third round was a similar affair before the dramatic ending, where Khabib won via rear naked choke.
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