Mark Webber's Porsche crew says they are thrilled to notch up a second consecutive victory and close the gap on FIA World Endurance Championship leaders Audi as the pressure builds towards the season climax.

The #17 Porsche 919 Hybrid driven by Webber, Brendon Hartley, and Timo Bernhard claimed victory in the 6 Hours of the Circuit of the Americas after the sister Porsche machine suffered an electronic fault while leading inside the final hour.

The team gratefully received the gift after seeing their own lead disappear earlier in the race after they were handed a stop/go penalty when a mechanic laid a hand on the car during refuelling.

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Webber had initially grabbed his team the lead after a fantastic pass around the outside of Neel Jani at turn one on the opening lap, but the Australian pointed to co-driver Bernhard's double stint towards the end of the race as the key to its victory in Austin.

"I had a super start, got the braking point for turn one perfectly right and passed Neel," Webber said. "Everything went really well except for my second pit stop. In this very wide pit lane I overshot our garage. When it comes to double stints Timo is the man. Hats off."

"It was an exciting race. When we had the stop and go penalty in the beginning it looked pretty much as if we would have bad luck today," Bernhard added. "We had dropped back to second, but in the end we still won the race and earned points for the championship."

The #17 Porsche closed the gap on the #7 Audi of Andre Lotterer, Marcel Fassler and Benoit Treluyer to just ten points with three rounds remaining.