Helps Pat McAfee Defeat The Miz

Pat McAfee made a surprise appearance at WrestleMania 39 Saturday night … challenging The Miz — who was hosting the extravaganza — to a match … and the former NFL star walked away with the victory, thanks to some help from 49ers tight end George Kittle!

McAfee came out at SoFi Stadium dressed for a fight ... accepting rap icon Snoop Dogg's challenge for someone to compete against Miz on "The Grandest Stage of Them All" -- and the 80,000+ WWE fans loved the idea of the impromptu match.

Pat and Miz began fighting ... but at one point during the match, Miz got in Kittle's face -- who had been sitting ringside -- pushing the All-Pro TE ... and setting the stage for GK to make his WrestleMania…