Reigning F1 world champion Jenson Button set the pace this afternoon at Istanbul Park in second free practice for this Sunday's Turkish Grand Prix, the seventh round on the F1 2010 schedule.

Button, who had been second best this morning - almost a second off his team-mate, Lewis Hamilton, posted a 1 minute 28.280 seconds in FP2. That left him a tenth up on current championship leader Mark Webber, while Sebastian Vettel was third in the other RB6, 0.212 seconds further adrift.

Despite finishing FP2 in second and third though, Red Bull won't be pleased as Webber suffered a technical problem late on and was forced to park his car at turn 2. Early reports suggest it was an engine failure.

Hispania's Bruno Senna was the first man out in the second session and having missed FP1, as Sakon Yamamoto ran in his car, he was keen to put in as many laps as possible.

Robert Kubica set the early pace for Renault, before Hamilton, Button and Vettel took turns at the top of the times.

Button posted the marker for the day with around 30 minutes left to run, making the most of his soft tyres.

Hamilton was fourth in the sister McLaren MP4-25, and he was one of only two runners not to improve in the second session, although his times were pretty identical.

Fernando Alonso completed the top five for Ferrari, ahead of the Mercedes cars of Nico Rosberg and Michael Schumacher. Alonso was less than impressed with the latter and gestured as much during the second session, when he felt he had been impeded by the German.

Kubica and Vitaly Petrov kept the two-by-two formation going in eighth and ninth for Renault, while Felipe Massa was tenth. Massa failed to set a representative time on his soft tyres after spinning at turn 8. Petrov also had a moment at the same place, as did Adrian Sutil.

Sutil was able to resume running this afternoon despite crashing out near the end of the first session. While that off damaged the front of his Force India, he only missed the first third of FP2. He remained on it as well, setting the eleventh best time, despite again running wide at turn 8.

Nico Hulkenberg was next up and impressively, even though he had hydraulic issues, he was more than half a second up on his Williams team-mate, Rubens Barrichello, who was down in 17th. Kamui Kobayashi and Pedro de la Rosa came in 13th and 14th, with Sebastien Buemi and Vitantonio Liuzzi trailing the two Saubers.

Jaime Alguersuari was the last of the established runners in 18th, with the Lotus' again the best of the newcomers. Heikki Kovalainen led the way for Lotus and his best effort was a 1m 31.610s, just 0.677 seconds off Alguersuari's Toro Rosso.

Lucas di Grassi managed to split the two Lotus' and was 20th for Virgin, although only because Jarno Trulli lost time this afternoon with gearbox issues. Timo Glock and the Hispania cars of Senna and Karun Chandhok brought up the rear, the latter spinning late on at turn 8.


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