Rookie Chase Briscoe was fastest in the first Camping World Truck Series practice at Chicagoland Speedway.
The Brad Keselowski Racing driver posted a top speed of 175.296 mph around the 1.5-mile track.
Briscoe recorded 17 laps in the first of two 55-minute practice sessions for the regular-season finale.
Justin Fontaine recorded the most laps with 22.
No driver recorded 10 consecutive laps in the session.
The second practice session is scheduled for tonight at 6:30 p.m. ET.