Nico Rosberg posted the quickest time in a rain-shortened final practice session for the Brazilian Grand Prix at Interlagos.

Heavy rain shortly before the session was due to start led to the start being delayed when the FIA medical helicopter was grounded, with the green flag eventually flying with less than 20 minutes remaining.

With rivers of water running across sections of the track, conditions were far from ideal but Rosberg was able to post the quickest time with a lap of 1min 23.182secs putting him sixth tenths of a second clear of Williams team-mate Kazuki Nakajima.

Points leader Jenson Button was third for Brawn GP, with Fernando Alonso, Adrian Sutil and Romain Grosjean rounding out the top six.

Alonso and Kimi Raikkonen both suffered spins on the exit of turn five after aquaplaning on standing water, while Grosjean - who had earlier suffered a spin at turn one - also went off at turn five but in more dramatic fashion.

His Renault snapped sideways exiting the corner and went off onto the grass, briefly becoming airborne before hitting the barriers head on in an incident which brought out the red flag with four minutes remaining.

While Grosjean was uninjured in the accident, the Renault team now faces a race against time to prepare the car for qualifying, which also looks likely to be hit by poor weather conditions.

The session was not restarted following Grosjean's accident.

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