Ex-UFC Fighter Melvin Guillard KO’s Man In Bar Attack, Wanted By Cops

EXCLUSIVE

Ex-UFC fighter Melvin Guillard — who fought the likes of Nate Diaz and Justin Gaethje — brutally attacked and KO’d a man in a Colorado bar … and now cops are on the hunt. 

TMZ Sports has obtained surveillance footage which shows the 35-year-old getting into it with several people at Bar Standard in Denver around 2 AM on Monday morning. 

After some pushing and shoving, you can see Guillard — with his trademark bleach blonde hair — cold-cock a bar patron in the face … knocking the guy out cold before he hit the floor. 

The victim was clearly unconscious and people ran to tend to him — while a female patron tried to attack Guillard in retaliation. Guillard hit her too.

TMZ Sports spoke with a Denver Police Dept. spokesperson who told us several witnesses were able to identify the attacker as Guillard … and now a warrant has been issued for his arrest. 

Guillard was a pretty promising MMA fighter when he first started out — appearing on “The Ultimate Fighter” season 2. He famously scored a victory against UFC stud Jeremy Stephens back in 2010. 

But, he also got his ass kicked a lot … chalking up Ls to guys like Nate Diaz, Israel Adesanya, Justin Gaethje, Michael Johnson and Donald Cerrone. 

We’ve reached to Guillard for comment — so far, no word back.