Ricky Williams was one of the best running backs of his era ... but he says he had the potential to dominate in a completely different sport -- the former Miami Dolphins standout tells TMZ Sports he could have been an All-Star if he pursued a career on the baseball diamond!!
Before he made his way to the NFL gridiron, Ricky -- whose legal name is now Errick Miron -- played several seasons with the Philadelphia Phillies' farm system while juggling his time with the Texas Longhorns football team.
Ricky -- an 8th-round pick to the Phils in the '95 MLB Amateur Draft -- was an outfielder for the organization's rookie league and Single-A teams for four years .