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| Hélio Castroneves led a Chevrolet 1-2 in IndyCar second practice |
Ryan Hunter-Reay was quickest in the first session and was third in the second practice. Scott Dixon was fourth fastest, 0.3722 back of Castroneves and three-time Sonoma winner and current Verizon IndyCar Series championship leader Will Power rounded out the top five, 0.3788 seconds behind his teammate.
Sébastien Bourdais was sixth fastest with Josef Newgarden just under a half second back of Castroneves in seventh. Juan Pablo Montoya was eighth just ahead of Tony Kanaan in ninth. Marco Andretti rounded out the top ten, 0.6035 seconds back. Andretti's teammate Carlos Muñoz was the fastest rookie for the second consecutive session with the Colombian in eleventh.
Charlie Kimball was just over three-quarters of a second back of Castroneves in twelfth. Third in the IndyCar championship Simon Pagenaud was thirteenth. Justin Wilson was fourteenth with Takuma Sato rounding out the top fifteen. Graham Rahal was sixteenth with Mike Conway the final car within the fastest lap of the session.
Sebastián Saavedra was eighteenth with James Hinchcliffe in nineteenth. Three rookies rounded out the session. Mikhail Aleshin was ahead of Carlos Huertas and Jack Hawksworth. The field was covered by 1.3330 seconds. Rahal, Conway and Huertas all ran a session-high 19 laps. Hunter-Reay ran a session-low 12 laps.
IndyCar qualifying will be taking place at 7:35 p.m. ET. NBCSN will be covering qualifying live at 7:30 p.m. ET.
