Audi scored its second straight 1-2 finish in the American Le Mans Series after Marco Werner and Lucas Luhr clinched a 2.463-second victory over team-mates Marcel Fassler and Emanuele Pirro in the Generac 500.
Werner passed race leader David Brabham on Road America's long front stretch for the lead with 20 minutes left. TDi power then overhauled the Acura in the waning moments as two late yellow flags played into Audi's hands, just as it did two weeks ago at Mid-Ohio – leading to the 1-2 finish.
Werner and Luhr won for the sixth time this season in LMP1 and fourth time overall while the R10 TDIs also won back-to-back overall races for the first time in two years.
"It was an exciting race and wasn't as easy as it looked especially after the second-to-last yellow," Werner said. "It was really difficult to pass the Acuras but the traffic helped me get a little closer and then TDI power helped me overtake them. After that everything was really nice."
"The season so far has been very good," Luhr added. "We had an unlucky race at Sebring but we came back strong at St. Petersburg and Long Beach. No one expected us to be as strong there after last year. The same thing can be said for Lime Rock and Mid-Ohio. Today we did everything right and I think we were fastest in every session. We totally deserved to win this one."
Intersport Racing led overall early thanks to a strong drive early from Jon Field. The Lola B06/10-AER of Field, son Clint and Richard Berry finished third in class and seventh overall.
Brabham and Scott Sharp scored their third LMP2 victory of the season for Patron Highcroft Racing and Acura, thanks in large part to Franck Montagny's crash in the Andretti Green Racing Acura with eleven minutes remaining. Montagny, who teamed with James Rossiter, tried to dive down to the inside of a slower GT2 Aston Martin at the end of the long backstretch. Neither car made it back around.
Late-race strategy by the Patron Highcroft team meant Brabham led overall with 14 minutes before Luhr's mighty blast from third to first. The team called the car on three straight yellow laps to top of with fuel to make certain the car could make the last 63 minutes on fuel. The plan nearly worked to perfection were it not for one final caution period with 34 minutes left that brought the Audis within striking distance.
"It was really hard to keep in front of the Audis because they are so strong on the straights," Brabham said. "I had to let them and Franck go and my main concern there was keeping the Porsches behind me, which we did. I think it was possible to have Acuras finish 1-2 but we managed to pick up the pieces."