The 2017 Mid-Ohio Challenge was the 21st stock car race of the 2017 NASCAR Xfinity Series season and the fifth iteration of the event. The race was held on Saturday, August 12, 2018, in Lexington, Ohio at the Mid-Ohio Sports Car Course, a 2.258 miles (3.634 km) permanent road course. The race took the scheduled 75 laps to complete. At race's end, Sam Hornish Jr., driving for Team Penske, would hold off the field on the final restart with five to go to complete a dominant performance. The win was Hornish's sixth and to date, final career win in the NASCAR Xfinity Series and his only win of the season. To fill out the podium, Daniel Hemric, driving for Richard Childress Racing, and Matt Tifft, driving for Joe Gibbs Racing, would finish second and third, respectively.