Eli Manning apparently ain't the only one with Tom Brady's number ... Morgan Wallen just proved he, too, can slay the G.O.A.T. -- beating him in a round of golf earlier this month.
Brady said Thursday the loss to the country music superstar went down last week ... after he challenged the "Last Night" crooner to nine holes at the Troubadour Golf and Field Club in Tennessee.
Brady documented the guys' round for a video on his YouTube channel -- and while TB12's swing looked crisp, Wallen's was clearly far more efficient.