Nick Diaz ended up in the middle of a huge brawl while partying at Hyde nightclub in Vegas early Wednesday morning … TMZ Sports has learned.
A rep for the club tells us the UFC fighter went to a bathroom outside the club around 2:30 AM, and accidentally stumbled into another customer … who started talking smack.
We’re told Nick apologized and said he didn’t want any trouble, but 3 other men then joined the first guy and jumped Nick … who tells us, “I didn’t start it. They didn’t know who I was.”
He tried to defend himself, and got hit hard in the head — and then the fight spilled out of the bathroom, and out onto the Bellagio’s casino floor.