Matt Barnes has officially "buried the hatchet" with his ex-nemesis, Derek Fisher ... saying he's totally cool with the L.A. Sparks head coach after their infamous backyard brawl.
Of course, the two ex-NBA ballers nearly broke the internet back in 2015 ... when Barnes punched Fisher in the mouth for dating his ex-wife, Gloria Govan, and being around his kids without his knowledge.
The moment got so big, even Kanye West mentioned the incident in his track "30 Hours."
But now, Barnes says he's actually made up with D-Fish .