William Byron topped the speed chart in the first of two practice sessions Friday at Phoenix Raceway.
Byron posted a top speed of 134.595 mph around the 1-mile track with less than five minutes left in the session. He recorded 28 laps in the session.
Rookie Tyler Reddick recorded the most laps in the session with 36.
Final practice is scheduled for 5:35 – 6:25 p.m. ET on FS1.