Red Bull continue their Qualifying success but Vettel loses his 100% record, as team-mate Webber topped the timesheets in Q3 on Saturday.
McLaren drivers were 3rd and 4th until they were split by Fernando Alonso (who had qualified 5th in each race so far this season).
2010 Russian Rookie Petrov qualified 6th for Lotus-Renault (though his team-mate Nick Heidfeld will start from the pitlane after a fire prevented him from participating the Qualifying session on Saturday. Nico Rosberg out-qualifies his F1 veteran team-mate Michael Schumacher again in 7th position, and Schumacher finished in 10th - hampered by KERS problems.
Massa starts in 8th position and will have a Williams close to him on the grid. This is the first time a Williams car has made it to Q3 and it's the first flash of brilliance from rookie Pastor Maldonado.
Qualifying Order: WEB, VET, HAM, ALO, BUT, PET, ROS, MAS, MAL, SCH.