The 2018 Bommarito Automotive Group 500 Presented by Valvoline was the 15th round of the 2018 IndyCar Series season. The race was held on August 26 at Gateway Motorsports Park in Madison, Illinois, just east of St. Louis, Missouri. 2017 Indy 500 pole winner Scott Dixon qualified on pole position after qualifying was canceled due to rain, while 2018 Indy 500 champion Will Power took victory in the 248-lap race.