Ganassi Racing’s Scott Dixon topped the timesheets following the opening two practice sessions at Mid-Ohio.
In his Chevrolet machine, Dixon – who has won five times at Mid-Ohio Sports Car Course – recorded the quickest lap at 1m05.9645s in the afternoon session. That time is six-tenths of a second off the track qualifying record set by Dario Franchitti in 1999 and matched by Gil de Ferran in 2000.
"We went through a few different setup changes just to try to find our groove, but overall the car was pretty quick," said Dixon. "We'll hopefully carry some speed into (qualifying) and try to start up front."
Sebastien Bourdais, the pole sitter for the 2014 race at Mid-Ohio, was fastest in the morning practice (1m06.2034s) and second in the afternoon (1m06.0190a) in his KVSH Racing Chevrolet.
Five different teams were represented in the top five, and the top 20 cars were separated by less than a second in afternoon practice.
Dixon is third in the Verizon IndyCar Series championship standings entering Round 14 of 16. Front-runner Juan Pablo Montoya of Team Penske has a 42-point advantage over Graham Rahal of Rahal Letterman Lanigan Racing and Dixon is 48 points out of first.
Reigning champion Will Power, who is fifth in the standings, was third quickest in the second practice (1m06.0781s) in his Verizon Team Penske Chevrolet, and Rahal (1m06.1049s) was fourth in the first Honda.
Takuma Sato, who this weekend will mark his 100th Indy car start, was fifth (1m06.1361s) in the No. 14 ABC Supply Honda for AJ Foyt Racing.
Montoya, who was limited to 12 laps in the morning practice because of an alternator issue, had a best lap of 1m06.9930s among 21 laps in the afternoon for 22nd on the combined time chart.