• Sebastian Vettel beats Jenson Button on final lap in Istanbul
• Lewis Hamilton suffers oversteer and finishes a lowly 16th
Red Bull's Sebastian Vettel claimed pole position for the Turkish grand Prix ahead of Brawn GP's Jenson Button and Rubens Barrichello in this afternoon's qualifying session at Istanbul Park.
The 21-year-old German driver left it until the final lap to post his fastest time of 1min 28.316secs and denied Button a hat-trick of starts from the front of the grid.
It is the third pole of the 21-year-old German's career, with both his victories to date coming from the front of the grid, in Italy last year and China this season.
"It's quite a surprise to be quickest in all three sessions, but finally we have made it and we are ahead of the white cars," said Vettel. "It's been quite an effort by the team because we had some parts arrive late, but they've fixed them on and we've made it."
The 2008 champion, Lewis Hamilton, had another afternoon to forget as he continued to struggle with his car which former constructor Eddie Jordan described as "simply hopeless, possibly the worst McLaren have ever designed".
Hamilton struggled with his steering at corner eight and spun out of qualifying on the first round. He will start tomorrow's grand prix facing an uphill battle from 16th on the grid.
"Welcome to my world," said Hamilton in a rare display of gallows humour. "It's the car. It has got slower and slower throughout the weekend as the track has got hotter. It looked great yesterday, but this morning it didn't look fantastic.
"I don't think we should rush anything. It's better we take our time to refine it. It's not like we can claw back 60 points [in the championship]."
Vettel's Red Bull team-mate, Mark Webber, will start the race fourth on the grid, ahead of Toyota's Jarno Trulli and the Ferraris of Kimi Raikkonen and Felipe Massa.
1 Sebastian Vettel (Ger) Red Bull 1min 28.316secs, 2 Jenson Button (Gbr) Brawn GP 1:28.421, 3 Rubens Barrichello (Bra) Brawn GP 1:28.579, 4 Mark Webber (Aus) Red Bull 1:28.613, 5 Jarno Trulli (Ita) Toyota 1:28.666, 6 Kimi Raikkonen (Fin) Ferrari 1:28.815, 7 Felipe Massa (Bra) Ferrari 1:28.858, 8 Fernando Alonso (Spa) Renault 1:29.075, 9 Nico Rosberg (Ger) Williams 1:29.191, 10 Robert Kubica (Pol) BMW Sauber 1:29.357, 11 Nick Heidfeld (Ger) BMW Sauber 1:27.521, 12 Kazuki Nakajima (Jpn) Williams 1:27.629, 13 Timo Glock (Ger) Toyota 1:27.795, 14 Heikki Kovalainen (Fin) McLaren 1:28.207, 15 Adrian Sutil (Ger) Force India 1:28.391, 16 Lewis Hamilton (Gbr) McLaren 1:28.318, 17 Nelson Piquet Jr (Bra) Renault 1:28.582, 18 Sebastien Buemi (Swi) Scuderia Toro Rosso 1:28.708, 19 Giancarlo Fisichella (Ita) Force India 1:28.717, 20 Sebastien Bourdais (Fra) Scuderia Toro Rosso 1:28.918
Button wins Turkish grand prix
Button pips Vettel to pole in Spain
Hamilton storms to pole for Italy GP
Vettel grabs Silverstone pole
Lewis Hamilton fastest in practice
Jenson Button left trailing in his...
Vettel springs Shanghai surprise
Jenson Button on Monaco pole
Lewis Hamilton on pole in Singapore
Barrichello beats Button in Italy
Vettel closes gap on Button in Japan
Jenson Button claims Turkish Grand...
Jenson Button wins Spanish Grand Prix...
Hamilton returns to winning ways
Sebastian Vettel wins Chinese Grand Prix
Live - Turkish Grand Prix
Live - Spanish Grand Prix
Vettel grabs pole for Turkish Grand Prix