Kurt Busch sailed to the top of the Sprint Cup speed chart in Friday’s lone practice session at Phoenix International Raceway.
Busch completed 18 laps, with a field-best speed of 138.846 mph.
A total of 39 cars took to the track for the session. There will be two more practice sessions on Saturday. Qualifying for the Good Sams 500 will take place today at 6:45 p.m. ET.