With a lap of 126.645mph around Bristol Motor Speedway, it was Chase Elliott atop the leaderboard in opening Cup Series practice.
Kyle Larson clocked in second at 126.312mph with Alex Bowman third at 126.295mph. Erik Jones was fourth fastest at 126.187mph, and Ryan Blaney completed the top five with a speed of 126.146mph.
There were no incidents or issues in the 1 hour, 20-minute session.
Joey Logano was sixth quickest at 126.112mph. Kyle Busch followed him at 125.939mph.
Busch won at Bristol in the spring and is also the defending race winner.
Kurt Bush was eighth fastest at 125.914mph with Ricky Stenhouse Jr. ninth quickest at 125.881mph. Denny Hamlin rounded out the top five with a run of 125.856mph.
UP NEXT: Fnal practice at 12:40 p.m. ET.