National Guard Panther Racing team happy with pace during two practice sessions during the day.
Kimball has now been in the top-10 of the IZOD IndyCar Series point standings four times this season and has spent five of the 14 rounds there in 2013.
The event marks Round 15 of the 2013 championship and Justin, who drives for Dale Coyne Racing, aims to gain ground in the championship hunt.
Strong Mid-Ohio laps give ECR a solid base for Sonoma run
National Guard Panther driver recovers from wrist surgery and makes return at Sonoma Raceway
With the combined efforts of Rotondo Weirich (RW) and Muscle Milk, American Le Mans Series LMP1 championship points leader Lucas Luhr will race his first laps in an open wheel car for SFHR.
Lisa Davidson, IndyCar Correspondent