Watch: Grant pulls off insane submission as Assuncao retires from MMA

Davey Grant might walk away with the highlight of the weekend in mixed martial arts.

In need of a finish to win, Grant put Raphael Assuncao to sleep with a rare reverse triangle choke with 17 seconds left in their bantamweight bout at UFC Las Vegas on Saturday night.

The Englishman dropped Assuncao with a spinning backfist to set up the submission.

Moments earlier, referee Keith Peterson deducted a point from Grant for grabbing the fence. At the time, Assuncao was trying to get Grant to the ground. Following the point deduction, Peterson controversially restarted the fight in the stand-up department.

Going into the third round, the judges' scores were 20-18 Assuncao (twice) and 19-19.

After the fight, Assuncao announced he was retiring from MMA.

"I was able to do this for 19 years as a professional," he said. "But I think my time has come now."

The Brazilian was a top contender in the bantamweight division for years and is one of the best fighters never to challenge for a UFC title. He owns the second-highest number of UFC bantamweight wins (12) after current champion Aljamain Sterling and former champ TJ Dillashaw (13 each). In the fight with Grant, Assuncao passed Urijah Faber for the most total fight time in UFC bantamweight history at 3:44:19, according to ESPN.

Assuncao made his pro debut in January 2004 and became a known commodity in the WEC. He joined the UFC in 2011 and defeated the likes of Sterling, Dillashaw, Marlon Moraes, Rob Font, and Pedro Munhoz, but ultimately fell short of a title shot. He also owns wins over Jorge Masvidal and Joe Lauzon while competing as a lightweight.

Assuncao went 1-5 in his final six Octagon appearances, with his last victory being a decision over Victor Henry last October. He retires with a 27-10 pro record.