Audi returned to its former dominating form at the Mid-Ohio Sports Car Course after taking a 1-2 finish in the Acura Sports Car Challenge with Lucas Luhr and Marco Werner taking the first overall victory for the marque's R10 TDI since April.

The German, who had qualified only fifth fastest, crossed the finish line 7.717secs ahead of the car shared by team-mates Emanuele Pirro and Dindo Capello, despite driving the last hour and 55 minutes with the same set of Michelin tyres and making just one stop for fuel.

Werner started the race, and had already moved up to third on the opening lap, was second by lap three and took the lead for good when he passed polesitter Gil de Ferran's Acura ARX-01b a minute later.

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Audi's victory broke a string of consecutive overall wins for Penske Racing, Porsche and LMP2 entries at Mid-Ohio, a year on from Werner and Pirro placing third overall in the first race for the diesel-powered R10 TDI. The drivers credited winter development and a better-handling race car for the improvement in navigating the ups, downs and arounds of the famous road course.

"This is not really a circuit for us and that makes this a sweet one," Werner said, "but, over the off season, we did some good testing with Michelin and made some good steps. We were really good on the street circuits as well. The combination we have is on the top level - a good tyre and a good car."

There also is something to be said for good pit strategy, as the call for fuel only on the last stop saved Luhr and Werner twelve seconds in the pits compared to the other Audi. Given the final winning margin, the decision appears to have won the race.

"The engineers saw the performance of the car under the first safety car, and again how good it was after the second one," Luhr said, "They called over and said we were going to keep them on the car. I wasn't sure at first, but it really was the key for winning and a very good call.

"The first few laps after the safety cars, I pushed like crazy to build a gap. If you go through traffic and have a lead like we did, you are just a little bit more relaxed and that makes the traffic seem not so bad. Things worked out and, even on older tyres, I was able to pull away from the other cars. This was a perfect race and we are very happy."

Penske's Romain Dumas and Timo Bernhard won for the fourth straight year at Mid-Ohio, but had to make do with a third consecutive success there in LMP2 after being beaten to the top step of the overall podium by Audi. Dumas held off a hard-charging David Brabham in the closing minutes - a flashback to last week's race at Lime Rock - and won the class by 0.609secs.

"It was a big battle and very exciting today," the Frenchman said, "It was not an overall victory, but it was a very nice victory. All of our wins here have been very close and very tight. The track has been good for us and this is good for the championship."

A week ago, Brabham got by Bernhard with 90 seconds left at Lime Rock, and the Australian's Patr?n Highcroft Racing Acura got as close as 0.2secs in the waning moments at Mid-Ohio, but a minor off-course moment cost him his chance.

"Our crew worked so well and we overtook the #9 car in the pits," Bernhard said, "When you see a team work that professionally, that's how you win races. This track is very technical and it has been excellent for Porsche. We are trying to keep that reputation up."

Following Brabham and Scott Sharp, Adrian Fernandez and Luis Diaz placed third in LMP2 in their Lowe's Fernandez Racing Acura, giving the 'home' marque two of the three class podium positions. Bernhard and Dumas now lead the class championship by 28 points over Brabham and Sharp.

There was major drama in GT1 despite just the two Corvette Racing Corvette C6.Rs taking part. Johnny O'Connell and Jan Magnussen won for the fifth time this season - and fourth race in a row - but a race down pit-lane was the story of their day. Both team cars pitted at the two-hour mark and left their pit boxes at the same time, with O'Connell and Olivier Beretta racing to the pit exit, banging fenders and running a red flag in the process.

Beretta came out first, but both cars were penalised a total of seven minutes and 40 seconds for the incident. Once they were back out and racing, O'Connell made the winning pass with 25 minutes remaining.

"A lot of people might think that we are not a competitive group," O'Connell said, "That was a situation that came out of the long yellow. It was two guys arguing for the same area of road. I thought it should have been mine and he thought it was his. It wasn't hitting that hard - it was just like two buddies punching each on the arm."

The victory gave O'Connell and Magnussen a 16-point lead in the championship over Beretta and Oliver Gavin.

"We are here to win," Magnussen insisted, "We have to do our very best to beat them and make no mistakes. Sometimes it gets to this level. We are not parading around the track."

Tafel Racing's Dirk Muller and Dominik Farnbacher won for the third time this season in GT2 by taking a dominating victory with their Ferrari F430 GT, Muller taking the chequered flag over a minute ahead of Flying Lizard Motorsports' Johannes van Overbeek.

Farnbacher started fourth and pitted from second place, but the team beat the Farnbacher Loles Racing Porsche out of pit-lane and gained nearly a full lap on the rest of the GT2 field during the race's first safety car period.

"The pit-stop is a big opportunity to gain positions, as it's very hard for us to overtake," Farnbacher said, "All the drivers are very professional and it's hard to fight for positions, but we have good luck all the time as well as good mechanics and pit strategy. If everything works together, then there is a chance for victory. That is what happened today."

Class leaders J?rg Bergmeister and Wolf Henzler finished third, just 0.459secs behind their Flying Lizard team-mates, but Muller and Farnbacher's first win since Long Beach in April pulled them to within four points of the overall lead.

"It wasn't as close as St Petersburg or Long Beach, that's for sure," Muller said, "At the end, it was about controlling the field and there was no reason to push. We did everything right and controlled things to the end."