Ryan Blaney posted the fastest single lap in the first practice session for the Overton’s 400 at Chicagoland Speedway with a speed of 178.992 mph. Blaney also had the quickest average speed of 175. 620 mph set in a 14-lap run.
He beat Jimmie Johnson (178.861 mph) by .022 seconds. Johnson’s lap was set early in the session,
Daniel Suarez (177.725 mph) rounded out the top five.
Kevin Harvick posted the second quickest 10-lap average of 173.703 mph during a 20-lap run.