Heikki Kovalainen snatched top spot from his McLaren team-mate Lewis Hamilton with one minute of practice remaining Abu Dhabi Grand Prix.
Hamilton led the session for almost an hour before the Finn improved his time by 0.197 seconds to go quickest with a one minute 41.307 secs effort.
Brawn's new world champion Jenson Button was third fastest at the spectacular new £250m Yas Marina track.
Spanish rookie Jaime Alguersuari, driving a Toro Rosso, had the honour of setting the first competitive timed lap at the lavish new Yas Marina circuit in an incident-free opening session.
Red Bull's Sebastian Vettel was fourth on the timesheets ahead of Brawn's Rubens Barrichello. The two are fighting for second place overall in the championship.