SONOMA, Calif. -- Clint Bowyer raced to his first victory on a road course, and first with Michael Waltrip Racing, by holding off Kurt Busch at Sonoma.

Bowyer dominated Sunday's race by leading 70 of the 112 laps. Defending race winner Busch, in an unsponsored car, was all over the bumper of Bowyer's Toyota late and got a final shot at taking the win away when caution flew with four laps remaining.

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Only Busch damaged his car with roughly eight laps to go, and he worried the entire caution period whether his Chevrolet was ruined and had no chance of catching Bowyer through the two-lap overtime sprint to the finish.

Bowyer raced side-by-side with Busch at the green flag, then cleared Busch and pulled away for the win. Bowyer, who left Richard Childress Racing at the end of last season to join MWR, had to walk to Victory Lane to celebrate with his new crew after his car ran out of gas. "I'm super excited for everybody involved," Bowyer said. "To switch teams like I did was a huge risk and a chance for me, and it was a chance to showcase my talents."

It was a strong day all-around for MWR, which got a fourth-place finish from Brian Vickers. "Everybody is just working together," Bowyer said.

Tony Stewart passed Busch on the final lap for second. Busch was third.