Graham Rahal, driver of the No. 15 Gehl/DA Lubricant Honda, was fastest in second practice for the Kohler Grand Prix of Road America at Road America, with the speed of 140.265.
Will Power, driver of the No. 12 Verizon Chevrolet, was second fastest in practice, with the speed of 140.076, followed by Tony Kanaan, driver of the No. 10 NTT Data Chevrolet, with the speed of 139.344.
Juan Pablo Montoya, driver of the No.2 DeVilbiss Team Penske Chevrolet, was fourth fastest in practice, with the speed of 139.290, with Carlos Munoz, driver of the No. 26 Andretti Autosport Honda rounding out the top-five with a speed of 139.254.
Rounding out the top-10 was Max Chilton, Helio Castroneves, Scott Dixon, Ryan Hunter Reay and Alexander Rossi.
The only incident in the hour long practice was Kanaan got off track but no caution came out and he was able to get back on track and keep running.