Webber blames himself for losing US GP pole to team-mate Vettel

Webber (pictured right) held provisional pole for most of Q3 at Austin, with Vettel seemingly struggling to match his pace.

But a superior final sector on Vettel's last lap allowed the world champion to pip his team-mate by 0.103 seconds, leaving Webber frustrated about an error on his final run.

"I didn't think I had done enough and I needed to improve," said Webber.

"The first part of the lap was very good but I didn't quite get Turns 19 and 20 how I wanted.

"I tried to squeeze a bit more out but it's easy to unload the car in these conditions.

"Sometimes you are happy you have given your best and you're on the front row, but it slipped through our fingers.

"Well done Seb - he put three sectors together. I only put two and a half sectors together. It is not satisfying when you do that."

Vettel admitted that Webber had given him a tough time so far this weekend.

"I wasn't so happy with the first run in Q3 but had a solid run in the end and it was enough to put the car on pole," he said.

"It was close with Mark. He seemed to get closer and closer as the weekend went on.

"Fortunately I could just stay ahead. I think he might've made a mistake at the end."