Scott Dixon passed Mike Conway with three laps to go at Sonoma Raceway on Sunday, earning a dramatic IndyCar victory and muddying the overall championship race.
Series leader Will Power finished ninth after a ferocious last-lap push past Justin Wilson, setting up an intriguing finish to the Indy Car season Saturday at Fontana.
After starting on the pole, Power fell back to 20th with a mid-race spin. IndyCar is reviewing Power's tactics on the final lap.
Dixon is out of the race to defend his 2013 title, but he surged for his 35th career victory after leader Graham Rahal was forced to the pits for gas with four laps left.
The raceway was unaffected by an earthquake centered just northeast of the track about 10 hours before the race began. The 6.0 quake left several drivers alarmed, but unharmed.