Ezekiel Elliott Parties in Dallas

Ezekiel Elliott was ballin' out in the bar 36 hours before ballin' out on the football field against the Bengals ... and TMZ Sports has video.

The Dallas Cowboys superstar hit up Concrete Cowboy bar in Dallas Friday night/early Saturday morning. We're told Elliott popped bottles (including champagne) ... and chilled with friends.

The turn up had ZERO negative effect on his play ... 'cause E.E. had a ridiculously good game Sunday afternoon (134 yards, 2 TDs).

Check out the vid!