A late surge from Williams put Nico Rosberg on top of the free practice times for the fourth session in a row in 2009. Kazuki Nakajima took up second ahead of the two Brawns and two Ferraris.
Lewis Hamilton was seventh but team mate Heikki Kovalainen down in 20th suggests McLaren still have problems with their MP4-24. Review the Malaysian Grand Prix Practice 1 Live Blog below.
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Please remember this is a live blog not live chat – comments are moderated before going live and not every comment is published because we get so many! If you’re looking for information about the session such as where to find video or what the weather is at the track, you may find what you’re looking for by reading earlier parts of the live blog.