William Byron paces final XFINITY practice:

#9-William Byron was quickest in final practice at Phoenix with a speed of 131.661mph.
#7-Justin Allgaier was second, followed by: #18-Christopher Bell, #42-Alex Bowman, #20-Erik Jones, #22-Ryan Blaney, #00-Cole Custer, #2-Austin Dillon, #21-Daniel Hemric, and #1-Elliott Sadler.
39 drivers practiced during the session.
See complete results on the Phoenix practice 2 speeds page (pdf).