The first caution of the Subway Fresh Fit 500 is out after 20 laps, for debris.
There have been three lead changes among three seperate drivers.
Kurt Busch overhauled polesitter Carl Edwards on the first lap and led the first five circuits. Brother Kyle Busch, winner of the Camping World Truck and Nationwide races here this weekend, took over the lead on lap 6, passing Kurt entering the first turn.
After dropping to third on the start, Edwards passed both Busch brothers to reassert the lead, but made slight contact with the wall just before the caution flag waved.
Under the caution flag, Kurt Busch stayed on track to take the lead as Edwards, Kyle Busch, and others pitted for tires.
NASCAR has scheduled a competition caution at lap number 40 to check tire wear due to the heavy rains that fell in Phoenix overnight. Per NASCAR rules, teams are not allowed to refuel their cars before the competition caution.
Jeff Gordon's car had lost it's scoring transponder but has been replaced and he reassumed his position in 11th place.