#54-Kyle Busch was fastest during opening practice at Auto Club Speedway with a speed of 174.157mph. #5-Kevin Harvick was second, followed by: #22-Joey Logano, #20-Matt Kenseth, #6-Trevor Bayne, #9-Chase Elliott, #31-Dylan Kwasniewski, #2-Brian Scott, #98-David Ragan, and #7-Regan Smith. 35 drivers practiced during the session. See complete results on the Auto Club practice 1 speeds page (pdf).
