Joao Barbosa and Christian Fittipaldi earned their first IMSA victory of the season in Sunday's six-hour race at Watkins Glen International.

Fittipaldi and Barbosa led six different times throughout the endurance race.

Barbosa took the lead for good following the final round of pit stops with 40 minutes remaining and survived two late restarts to take the victory by .709 seconds over his Action Express Racing teammate, Dane Cameron, in the No. 31 Corvette DP. It was the first race on the newly repaved 3.4-mile Watkins Glen circuit.

"It was probably one of the fastest pace races that I've done in a while," Barbosa said. "The track really suits this kind of racing, and they did an amazing job with the surface. We were able to keep up the pace for a long time. We did a few changes after qualifying and we really hit it, because the car was really good."

The victory moved Barbosa and Fittipaldi into the Prototype points lead after six of 10 races. They lead by seven points (187-180) over a second-place tie between Cameron and his co-driver, Eric Curran, and No. 10 Wayne Taylor Racing Corvette DP co-drivers Jordan and Ricky Taylor, who finished fourth behind the No. 60 Michael Shank Racing Honda prototype shared by Ozz Negri, John Pew and Olivier Pla.

In the GT Le Mans class, Ford Chip Ganassi Racing earned its second consecutive IMSA victory and its third overall after taking the GTE Pro class win in the 24 Hours of Le Mans two weeks ago with Richard Westbrook and Ryan Briscoe in the No. 67 Ford GT.

It also was the first 1-2 finish for the Ford GT program, which debuted in January's Rolex 24 Hours at Daytona. Le Mans winners Joey Hand and Dirk Mueller finished second in the team's No. 66 entry.

Christina Nielsen, Alessandro Balzan and Jeff Segal won the GT Daytona class in the No. 63 Scuderia Corsa Ferrari, while Renger van der Zande and Alex Popow won the Prototype Challenge race in the No. 8 Starworks Motorsport machine.