Jenson Button completed a pleasing day of practice as he topped the timesheet in Friday's second session ahead of the Chinese Grand Prix in Shanghai.

The 29-year-old, who is seeking his third successive victory of the season, had finished second quickest in the morning and clocked a time of one minute 35.679 seconds in his Brackley-built Brawn GP car to go fastest in the afternoon.

Nico Rosberg, in a Grove-built Williams, was 0.025secs behind in second, while Button's team-mate Rubens Barrichello was third fastest.

After finishing fastest in the morning session in his McLaren, world champion Lewis Hamilton could only manage 13th in the second session.