Ex-L.A. Chargers defensive end Chris McCain -- 6'5", 250 lbs -- DOMINATED his opponent in his first amateur MMA fight ... and the video is brutal.
The 27-year-old played 4 seasons in the NFL for various teams -- including a stellar 5-sack season with the Chargers in '17 -- but he was cut by the Colts in 2018 and has been training to become a pro fighter ever since.
Fast forward to Saturday night when McCain made his MMA debut at Shawne Merriman's Lights Out Xtreme Fighting promotion in Burbank, CA ... where he entered the case wearing his old Chargers jersey.