Islam Makhachev submitted Renato Moicano in one round to successfully retain his lightweight title at UFC 311 and set a new record.
The Russian has now defended his belt four times in a row, a first in the UFC.
The record was previously jointly held by legends Khabib Nurmagomedov, Benson Henderson and BJ Penn, who all managed three defences.
Makhachev, 33, staked his claim as the UFC's pound-for-pound best with an unstoppable performance on Saturday night in Inglewood, California.
"I like this belt," Makhachev said. "If somebody wants this belt, come to the cage."
Nurmagomedov was in Makhachev's corner, having taken on a coaching role since retiring from fighting.
Brazil's Moicano, 35, stepped in on 24 hours' notice on Friday, but he was no match for the dominant champion.
Less than a minute had passed after the first bell when Makhachev trapped a struggling Moicano in a brabo choke, forcing the challenger to tap almost immediately.
"I'm always looking for the finish," Makhachev said.
"I'm not just talk. All fight week, all my camp, all media, if my opponent gives me a small chance, I will close the night."
Makhachev also extended his current winning streak to 15, improving his overall record to 27 wins and just one loss.
