MORE: Full practice results
Kyle Larson led the first and only NASCAR Camping World Truck Series practice on Friday at Chicagoland Speedway.
Larson recorded his fastest time of 175.052 mph on Lap 40 of 40.
Coming up second-fastest to the JR Motorsports driver was defending two-time Truck Series champion Matt Crafton (174.967 mph).
Johnny Sauter (174.927 mph), Tyler Reddick (174.627 mph) and Timothy Peters (174.216 mph) completed the top-five fastest on the leaderboard.
Truck Series points leader Erik Jones was eighth-fastest (173.891 mph).
There are no previous Chicagoland winners in this weekend's field.
The Truck Series returns to the track at 4:35 p.m. ET for Keystone Light Pole Qualifying (FOX Sports 1) for Friday night's American Ethanol E15 225 (8:30 p.m. ET, FS1).