Dan Wheldon did 2 races in 2002 and was Rookie of the Year in 2003, but I'm not sure what the cap is. I thnk in NASCAR you are classified as a Rookie if you've done less than 16 races, and less than 8 in any one season (bearing in mind the extra length of their years). Incidentally, Dale Earnhardt made his debut in 1975 and was Rookie of the Year in 1979, as he did occasional races for a few years.
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