In his next race at the Arizona State Fairgrounds in Phoenix, Rostek took the lead midway through the event, led 58 laps and won his first NASCAR Grand National race. Rostek followed his win with two top ten finishes, finishing third at Marchbanks Speedway and seventh at Montgomery Air Base after leading seven laps and starting on the pole.
Rostek's performance in his next race at the Arizona State Fairgrounds in Phoenix was marked by him taking the lead midway through the event and going on to win his first NASCAR Grand National victory. He then followed this success with two top ten finishes, coming in third at Marchbanks Speedway and seventh at Montgomery Air Base after leading seven laps and starting from the front.