- Qualifying: August 24, 2013
- Race Day: August 25, 2013
- City: Sonoma
- Country: U.S.A.
- Laps: 85
- Lap Distance (Mile): 2.385
- Late-Race Penalty Costly to Dixon at Sonoma
- Scott Dixon made contact with a tire being carried by a Team Penske crew member while exiting his pit stall during the final round of pit stops, dropping him to a 15th-place finish.
- Franchitti, Dixon Top Qualifying at Sonoma
- Dario Franchitti will head an all-Honda front row for Sunday’s Indy Grand Prix of Somona after leading his Target Chip Ganassi Racing teammate Scott Dixon to a 1-2 result in IndyCar Series qualifying Saturday at the Raceway at Sonoma.