Kurt Busch, who will start Sunday’s race second, posted the fastest single lap in practice Saturday morning at Phoenix International Raceway with a lap of 139.627 mph.
Busch also had the fastest average over 10 laps (138.83 mph) and 15 laps (138.30). Johnson was second in both. Carl Edwards ranked third over a 10-lap run at (137.75) and was followed by teammates Kyle Busch (137.61) and Denny Hamlin (137.45).
There were no incidents in the session.
One Sprint Cup practice remains today.