Practice 2 Report - Button back ahead

Jenson Button set the fastest time of the afternoon session in Shanghai on Friday, beating Nico Rosberg's Williams-Toyota and Button's Brawn GP team-mate Rubens Barrichello.

The three men were clear of the two Red Bull drivers, with Mark Webber beating Sebastian Vettel on this occasion.

Sixth fastest of the session was Jarno Trulli in his Toyota, ahead of Kazuki Nakajima in the second Williams and Timo Glock in the second Toyota.

Ninth overall was Heikki Kovalainen in his McLaren, ahead of Sebastien Bourdais's Toro Rosso, Adrian Sutil's Force India and last year's World Championship contenders Felipe Massa, Lewis Hamilton and Kimi Raikkonen.

Sebastien Buemi was 15th overall in his Toro Rosso, ahead of Nelson Piquet's Renault, the two BMW Saubers of Robert Kubica and Nick Heidfeld, Fernando Alonso's Renault and Giancarlo Fisichella's Force India.