Austin McBroom is clearly ready for his fight this weekend ... 'cause he flattened one of his sparring partners in a recent training sesh -- and the YouTuber's violent KO punch was all caught on video obtained by TMZ Sports.
McBroom, who's slated to finally box AnEsonGib at the Social Gloves 2 event at Banc of California Stadium on Saturday night, showed off his improving skills in a workout just days ahead of the huge fight night.
In the footage, you can see McBroom probing his opponent -- before dropping him with a vicious right hand to the jaw.
The force of the blow was so heavy, the dude immediately crumpled to the canvas -- and nearly spilled out of the ring in the process.
McBroom has showcased his quick hands before -- pummelingBryce Hall in their fight back in 2021 -- but he's clearly taken things up a notch.
He and Gib have exchanged trash talk repeatedly over the last few months in the buildup to the fight -- and the guys nearly came to blows in the TMZ office last week. Seems McBroom is more than ready to settle things once and for all this week.