Road America United Sportscar: Action Express claims 1-2 result

Cameron moved into the lead in the #31 Chevrolet Corvette DP during the second round of pitstops, when he came in two laps earlier than the sister #5 car and the #10 Wayne Taylor Racing Corvette that had been part of a three-way scrap for first place.

That meant he assumed the lead when the rest of the frontrunners pitted, and Cameron held onto the top spot to the finish.

Barbosa kept the leader honest for the majority of the race, but the tension was taken out of the lead battle with around 15 minutes to go when Barbosa spun after making contact with the GTD Audi of Christopher Haase at Turn 1.

That cost the #5 car 10 seconds, but it had a big enough buffer over those behind to hang on to second place.

Third went to the pole-sitting Chip Ganassi Riley-Ford DP, which led the opening few laps with Joey Hand before a loose hose caused a loss of power and an unscheduled pitstop.

That ruled the #01 car out of contention for the victory, but Scott Pruett stayed out of trouble to climb back up the order, and he snatched third place from the Ligier-Honda HPD of Oswaldo Negri with eight minutes to go when the #60 car went off track.

Negri was trying to pass a GTD car around the outside of the Carousel when he ran out of grip, sliding wide and taking a trip through the gravel to give up third place.

Of the other early contenders, the championship-leading #90 Corvette DP fell down the order when Richard Westbrook was tagged into a spin on a messy early restart, and the #10 WTR car lost two laps when it suffered a suspension problem due to running over the kerbs.

There was last lap drama in both the PC and GTLM classes, with Bruno Junqueira taking the PC victory for RSR when he pressured Conor Daly into a spin at Turn 5 as they fought for the win.

GTLM honours went to the #911 factory Porsche of Nick Tandy and Patrick Pilet, which started at the back of the field following an engine change after qualifying.

The car was quickly up into contention towards the front of the class, and despite a spin for Tandy on an in-lap earlier in the race, it was able to move ahead of the sister #912 machine during the final round of stops, where both cars took left-side tyres only.

The #912 car, which led much of the race early on courtesy of Tandy's Le Mans-winning team-mate Earl Bamber, fell to third behind the #62 Risi Ferrari of Giancarlo Fisichella and Pierre Kaffer (which did not change tyres) during the final stops.

Kaffer spent the final laps defending second place from Jorg Bergmeister, but the pair came to blows just two corners from home, making side-to-side contact before Kaffer lost control and ran out into the grass, losing the position to the #912 Porsche.

RESULTS - 76 LAPS: