Formula One:Lewis Hamilton secured pole for Sunday's Singapore Grand Prix but there was disappointment for championship leader Jenson Button as his world title hopes were dealt a blow.
Hamilton, whose engineers worked through the night to fit a new chassis for his McLaren, impressed in practice earlier on Saturday and took that form into qualifying as he clocked a time of one minute 47.891 seconds in Q3 at the Marina Bay street circuit.
In contrast, Button had struggled in practice after his Brawn GP car had been switched to the same set-up as team-mate Rubens Barrichello earlier today and though they reverted it to Friday's settings, the 29-year-old could only qualify in 12th place.
Barrichello, who will be looking to cut into Button's 14-point lead, was fifth fastest before crashing with 26 seconds of qualifying remaining but will start from 10th on the grid after being hit with a five-place grid penalty for changing his gearbox prior to the session.
The Brazilian's crash brought the qualifying session to a premature end as the red flag was waved.
Brawn GP's mis-fortune keeps alive Sebastian Vettel's championship hopes as the Red Bull driver will line up alongside Hamilton in second place on the grid.
Williams' Nico Rosberg, meanwhile, will be looking to go one better than his second-place finish here last year as he starts from third.
"I am very, very happy and pleased for the team," said Hamilton.
"Friday practice was not spectacular for me. The guys worked until 10am this morning rebuilding the car. They did a great job and I am pleased we have been able to do this for them."
Mark Webber completed a pleasing qualifying session for Red Bull by securing fourth place while last year's winner Fernando Alonso moves into fifth in his Renault once Barrichello's penalty is applied.
Toyota's Timo Glock starts from sixth while the BMW Saubers of Nick Heidfeld and Robert Kubica will start seventh and eighth respectively with McLaren's Heikki Kovalainen in ninth.