Ryan Briscoe has won his first race at Sonoma, after finishing second, third and fourth at the track in previous years.
He was joined on the podium by fellow Australian, Will Power, who fought off a fast finishing Dario Franchitti to cross the line second and extend his lead in the IndyCar Series Championship.
Briscoe started from second on the grid and maintained his position for much of the race, until Power struck trouble. A slow pit-stop and traffic dropped the pole sitter behind Briscoe, who was then able to capitalise and take a hard fought victory.
“It’s Big. I want sure if I was every going to win again said Briscoe. “Especially here in Sonoma, I’ve always done so well at this track and I got my first-ever pole position here so it’s great to finally get the win. [It was a] Great battle with Will at the end there.”
Despite finishing in second place, Power extended his Championship lead due to his main title rivals, Ryan Hunter-Reay and Scott Dixon, striking trouble.
Hunter-Reay was hit from behind by Alex Tagliani, which caused him to spin and eventually cross the line in 18th place. Dixon had an even more eventful race, being spun on lap 11, having an off-track excursion, and serving a drive through penalty before finishing 13th.
Power now holds a 36 point lead in the championship with two races remaining.
The next race of the IndyCar Series is the Grand Prix of Baltimore on the second of September.