Red Bull driver Mark Webber was fastest in the first practice session for the Brazilian Grand Prix today, ahead of title contenders Rubens Barrichello of Brawn GP and Sebastian Vettel of Red Bull.
Formula One leader Jenson Button was seventh in his Brawn GP.
Webber clocked 1 minute, 12.463 seconds at the 4.3-kilometer (2.6-mile) Interlagos track, 0.411 ahead of Barrichello and 0.469 in front of Vettel.
Button, who has a 14-point lead in the drivers' standings and needs only a third-place finish on Sunday to clinch his first F1 title, had a best time of 1:13.141 after the 1-hour practice session under heavy clouds.
The second session will take place later in the afternoon.
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