Champion Ferrari, still without a point and in danger of slumping to its worst-ever start to a season, had Brazilian Felipe Massa eighth and Finland's Kimi Raikkonen 10th.

Trulli was surprised by his positioning as the team had problems with its fuel and brakes during the early stages of qualifying.

"There is much more potential in the car," Trulli said. "I must say I am very confident for the race because of my race pace and looking after the tires this weekend."

Vettel was the fastest in the second part of qualifying but was three tenths of a second slower than Glock and almost six tenths slower than Trulli in the final session.

"I am personally a bit surprised by how big the gap was to Jarno - it was very, very large," Vettel said. "It's very important to be in front of Jenson."

Red Bull's Mark Webber will start from 19th in the biggest qualifying surprise. The Australian, who finished a career-best second in China, was forced by Force India's Adrian Sutil to swerve on his final flying lap during the closing stages of the first session.

"You don't usually get caught out in traffic and that was the worst corner to get blocked," Webber said. "Absolute disaster."

Asked if he would lodge a complaint against Sutil, Webber said: "It doesn't make any difference now, does it?"

Sutil, who spun off in China five laps before Force India could have secured its first-ever race points, claimed innocence. "I didn't know Mark Webber was on a flying lap. I was trying to leave space for Alonso, there was a little misunderstanding," he said.

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