The 2018 Overton's 400 was a Monster Energy NASCAR Cup Series race that was held on July 1, 2018 at Chicagoland Speedway in Joliet, Illinois.

Contested over 267 laps on the 1.5-mile (2.4 km) intermediate speedway, it was the 17th race of the 2018 Monster Energy NASCAR Cup Series season.

[11] Brad Keselowski was the fastest in the final practice session with a time of 29.863 seconds and a speed of 180.826 mph (291.011 km/h).

[13] † The cars of Martin Truex Jr., Denny Hamlin, Jimmie Johnson, and Chris Buescher all started in the rear of the field after failing post-qualifying inspection.

Dave Burns, Marty Snider and Kelli Stavast reported from pit lane during the race.