#7-Justin Allgaier was fastest during opening practice at Bristol Motor Speedway with a speed of 125.363mph.
The rest of the top 10: #18-Kyle Busch, #11-Blake Koch, #1-Elliott Sadler, #2-Austin Dillon, #48-Brennan Poole, #98-Aric Almirola, #9-William Byron, #33-Brandon Jones, and #22-Joey Logano.
40 drivers practiced during the session.
See complete results on the Bristol practice 1 speeds page (pdf).
