#20-Erik Jones was fastest during opening practice at Phoenix International Raceway with a speed of 131.521mph.
The rest of the top 10: #22-Ryan Blaney, #9-William Byron, #33-Brandon Jones, #7-Justin Allgaier, #11-Blake Koch, #18-Daniel Suarez, #00-Cole Custer, #5-Michael Annett, and #28-Dakoda Armstrong.
Just 31 drivers practiced during the session.
See complete results on the Phoenix practice 1 speeds page (pdf).
