As expected, it was a McLaren that led the way in the first session, as Jenson Button set the pace.
Less predictably, a Red Bull pushed him hard. Despite suggestions - largely from the team itself - that this would be the title-chasing squad's worst weekend of the year, Sebastian Vettel got off to a bright start with second, 0.097 seconds behind Button and ahead of Lewis Hamilton in the other McLaren.
Robert Kubica (Renault) and Nico Rosberg (Mercedes) completed the top five.
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