Following Dixon was his Target Chip Ganassi Racing teammate and 2005 Sonoma winner Tony Kanaan. The Brazilian was 0.4745 seconds back of his former Andretti Autosport teammate. Team Penske driver and past Sonoma winners Hélio Castroneves and Will Power rounded out the top five Current Ganassi driver, former Penske driver and 2012 Sonoma winner Ryan Briscoe was sixth quickest, 0.6913 seconds back.
James Hinchcliffe was seventh fastest, trailing his teammate by 0.8070 seconds. Josef Newgarden was eighth quickest just 0.0196 seconds behind his fellow Honda driver Hinchcliffe. Sébastien Bourdais was ninth fastest with Marco Andretti rounding out the top ten, 0.8598 seconds back of Hunter-Reay.
Charlie Kimball was eleventh, 1.0131 seconds back followed by Juan Pablo Montoya in twelfth. Takuma Sato was thirteenth fastest, 0.0121 seconds ahead of the fastest rookie in the first practice, Carlos Muñoz. Justin Wilson rounded out the top fifteen, 1.2441 seconds back of the quickest time of the session. Simon Pagenaud was sixteenth and a had an off during the session.
Graham Rahal was seventeenth, only 0.0060 seconds behind the Frenchman. Mikhail Aleshin was eighteenth quickest, 1.5531 seconds behind Hunter-Reay. Sebastián Saavedra was nineteenth with Mike Conway rounding out the top twenty. Conway also had an excursion off course. Rookies Jack Hawksworth and Carlos Huertas were the final two drivers on the timesheet. The Brit was 1.9941 seconds off of Hunter-Reay with the field covered by 2.2582 seconds. Conway and Huertas ran a session-high eighteen laps.
IndyCar second practice will take place at 4:15 p.m. ET with qualifying scheduled for 7:35 p.m. ET. NBCSN will be carrying live coverage of IndyCar qualifying at 7:30 p.m. ET.
