A sanctioned matchup between Adrian Peterson and his poker rival is getting closer and closer to becoming a reality ... as TMZ Sports has learned the NFL legend and his opponent have just received an offer to settle their differences in an actual ring.
Damon Feldman, the founder of Celebrity Boxing, tells TMZ Sports ... he wants to make a real scrap between Peterson and Joe "Baby Joe" Castaneda happen after he saw the two go at it over cards at social club in Houston, Texas in May.