All

My bad you're right. He placed 2nd First race "Supercross" But most of these riders being discussed made their pro debut at the Nationals. Stewart won His first National race and dominated the rest of the season. If you compare Rookie season though Stewarts is tough to beat.

Hands down James Stewart had the best Pro Debut. Won the opening round and went on to dominate the rest of the season to win the championship.