UFC fighter Nick Diaz reportedly was attacked by a group of men outside a Las Vegas nightclub early Wednesday.

Diaz, the brother of Conor McGregror’s nemesis Nate Diaz, said he was leaving the bathroom of the Hyde nightclub inside the Bellagio when he accidentally bumped into a fellow partygoer, according to TMZ.

Diaz — who recently served an 18-month suspension from the Nevada Athletic Commission for using marijuana — apologized, but the man was not mollified and started yelling at Diaz. Eventually, the angry patron was joined by three of his friends and the group jumped Diaz, who has spent most of his career fighting at welterweight (170-pound limit).

“I didn’t start it. They didn’t know who I was,” Diaz told TMZ.

If they had known who Diaz was, they might not have attacked him. Diaz quickly took a couple of the guys to the ground, where he pounded on them with his fists and put them in chokeholds.

While Diaz was unleashing his MMA skills, the melee reportedly spilled out from Hyde’s bathroom onto the Bellagio’s casino floor, where his attackers grabbed chairs in order to fend off club and casino security.

Diaz, who suffered a nasty gash on his head that might require stitches, was confirmed by the casino as the victim in the whole ordeal. The 33-year-old decided not to press charges, saying his attackers “got the worst of it.”