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William Byron fastest in first Cup practice at Phoenix

NASCAR Cup Series Penzoil 400 presented by Jiffy Lube - Practice

LAS VEGAS, NEVADA - FEBRUARY 21: William Byron, driver of the #24 Axalta Chevrolet, gets into his car during practice for NASCAR Cup Series Penzoil 400 presented by Jiffy Lube at Las Vegas Motor Speedway on February 21, 2020 in Las Vegas, Nevada. (Photo by Matt Sullivan/Getty Images)

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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.

The top five was completed by Chase Elliott (133.849 mph), Brad Keselowski (133.309), Clint Bowyer (133.235) and Kurt Busch (133.220).

Rookie Tyler Reddick recorded the most laps in the session with 36.

Aric Almirola scrapped the wall at one point in the session, as well as Byron. Corey LaJoie got loose entering Turn 1 late in the session and smacked the wall.

Final practice is scheduled for 5:35 - 6:25 p.m. ET on FS1.

Click here for the practice report.