#22-Joey Logano was fastest during opening practice at Auto Club Speedway with a speed of 178.904mph.
The rest of the top 10: #42-Kyle Larson, #20-Erik Jones, #2-Paul Menard, #00-ColeCuster, #1-Elliott Sadler, #3-Ty Dillon, #18-Kyle Busch, #11-Blake Koch, and #21-Daniel Hemric.
37 drivers practiced during the session.
See complete results on the Auto Club practice 1 speeds page (pdf).
