The two UFC veterans are set to get into the boxing ring for a fight on July 6.
Diaz and Masvidal have a lengthy feud that dates back to their MMA clash in 2019 when the latter came out on top.
And there is no love lost between both 39-year-old’s teams as a mass brawl kicked-off ahead of the rematch.
The two fighters spoke to the media, with Diaz not in the mood for talking as he stormed off early and claimed he was “sick of sitting here”.
It led to their face-off happening just off the stage and soon after a punch-up began.
Words were exchanged and a fist was seemingly first thrown by a member of Diaz’s crew.
Security tried to intervene as Masvidal‘s boys fought back, landing a kick and a punch.
All hell then broke lose as strikes were landed by both and the duo tumbled to the deck, knocking several people over with them.
The fight stopped ended after Misvidal himself pulled Diaz’s pal away from the brawl by grabbing his dreadlocks.
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By that point, the man had already been left battered and bruised as blood ran down his face.
And things nearly came to blows again later as Diaz stopped mid-interview to confront Masvidal’s team.
He shouted at a group stood in the distance: “What you looking at? Come here and get you’re f***ing a** whipped then. Turn around b****.”
Diaz and Misvidal’s camp continued to exchange heated words before another fight was stopped by security.