Gil de Ferran continued his team's recent run of American Le Mans Series success by taking pole position for the Elkhart Lake round. The Brazilian beat title rival David Brabham's Highcroft Acura by 0.823 second.
"It was a great day for us today," said de Ferran, who will be aiming for a fifth straight victory tomorrow along with teammate Simon Pagenaud. "Since we unloaded the car has been fantastic."
Marino Franchitti took his and the Dyson Lola-Mazda combination's first LMP2 pole in third overall, fending off a late challenge from Adrian Fernandez (Fernandez Acura).
"The car was awesome," said Franchitti. "I actually made a real mess of the first run. I'm a bit disappointed with myself for that, but overall I'm just delighted for all the guys. It means so much."
Franchitti's team-mate Guy Smith secured fifth on the grid ahead of the Cytosport Porsche and the LMP1 privateers despite missing much of the session while his Lola-Mazda was repaired following a crash in pre-qualifying practice.
BMW took a breakthrough one-two in GT2 qualifying, with Joey Hand beating his Rahal Letterman Racing team-mate Dirk Muller to pole by 0.123sec.
"How about this BMW around Road America?" said Hand. "I don't think anybody really saw it coming, but this place has been really good to BMW. I've put it on our first pole of our new programme and I hope to take the first win too."
The championship-leading Flying Lizard Porsche of Jorg Bergmeister and Patrick Long will start third, just ahead of the two Corvettes, while the Flying Lizard Porsche and Risi Ferrari set identical times in sixth and seventh.
Guy Cosmo dominated in the Challenge class, taking pole by over a second.