Kyle Larson was fastest in the first Xfinity Series practice at Texas Motor Speedway for the O’Reilly Auto Parts Challenge.
Larson topped out at 185.599 mph. Daniel Suarez, a Chase contender, followed at 185.001 mph.
No one ran 10-consecutive laps in the session.
Chase driver Blake Koch did not complete a lap in the session after slamming the wall in Turn 2 on his first lap. Koch, who is third on the Chase grid will go to a backup car.