Deiveson Figueiredo has won the vacant UFC flyweight championship with a dominant performance and first-round submission stoppage.
The Brazilian defeated perennial contender Joseph Benavidez with a rear naked choke - with 12 seconds left in the first round.
Figueiredo defeated his American opponent in February by second-round knockout but missed the championship weight limit by 2.5 pounds, leading to their rematch.
In Saturday's co-main event, Jack Hermansson tapped out Kelvin Gastelum with a submission by heel hook one minute 18 seconds into the first round of their middleweight scrap.
The 12-fight card was the third or four UFC shows in two weeks from Fight Island, with the fourth at the Flash Forum to take place on July 26 with Australian former middleweight champion Robert Whittaker the headliner.
Figueiredo (19-1) became just the third 125-pound champion in UFC history - after Demetrious Johnson and Henry Cejudo - by thoroughly dominating his second victory in five months over Benavidez.
The Brazilian veteran knocked down Benavidez three times with punches and barely missed on several choke attempts before finally landing a choke that rendered Benavidez unconscious.
"I knew that my time was going to come, and this is my time," Figueiredo said through a translator.
"I'm going to continue to defend this belt, and I'm going to be an active champion."
Benavidez (28-7) dropped to 0-4 in UFC title fights with the first submission defeat of his 14-year pro career.
The 32-year-old Figueiredo is 8-1 since joining the UFC in 2017. He had previous fought only in Brazil.
Hermansson (21-5), a Swede who trains in Norway, rebounded impressively from a knockout loss last September with his fifth win in six bouts overall since 2017.
Afterward, Hermansson called out the winner of Whittaker's showdown next weekend with Darren Till.
Veteran lightweight Joseph Duffy - who famously beat Conor McGregor with a 38-second submission in November 2010 while both Irishmen were rising prospects - announced his retirement on Instagram shortly after he took his third consecutive loss with a first-round guillotine choke from Joel Alvarez.
After next weekend's show, the UFC will return to Las Vegas for at least four shows at the Apex gym on its corporate campus.
The promotion is likely to return to Abu Dhabi in the upcoming months, particularly if the coronavirus pandemic worsens in Nevada.