Answer
The answer is, Johnny Sauter never competed in any other racing series before NASCAR. He began his racing career in go-karts and moved up to the NASCAR Featherlite Southwest Series in 1998, where he won championships in 2001 and 2002 before advancing to the NASCAR Truck Series in 2003. He has remained in NASCAR ever since, competing in the Truck Series, Xfinity Series, and Cup Series.