Both came in 2003, when Mueller started at some of the sport's short tracks. He made his debut at ORP, starting 31st in the field for Team Racing. Mueller kept his nose clean and ended up 26th, six laps down. Mueller was then picked up by Green Light Racing for Martinsville, where once again Mueller finished the race at a tough short track. He was rewarded by setting a career best 25th place showing. He has not raced since.