Nico Rosberg was fastest again for Mercedes in the second free practice session at Interlagos, although the weather conditions again played a major part in proceedings ahead of the Brazilian Grand Prix.

Rain before the session got underway meant there was only limited running on track, with only two drivers completing 20 laps during the second 90 minutes of running available.

Rosberg had topped the times for much of the session on a time set early on on the wet Pirelli tyres but conditions improved enough in the closing stages to allow teams to switch to the intermediate rubber in the final ten minutes.

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Sebastian Vettel and Mark Webber both improved to put Red Bull into the top two places but Rosberg was able to respond with a best time of 1min 27.306secs putting him two tenths clear of Vettel at the top of the timesheets.

That was still more than three seconds slower than the German had managed in the earlier session.

Heikki Kovalainen was a solid fourth for Lotus ahead of Lewis Hamilton, who was amongst those to spin in the session as he struggled to get the most from his Mercedes. The Briton would complete just nine laps all session and was the final man within a second of the outright pace.

Jean-Eric Vergne edged out home favourite Felipe Massa for sixth place, with Nico Hulkenberg, Daniel Ricciardo and Romain Grosjean rounding out the top ten.

Showing how tough the conditions were, Jenson Button elected to spend most of the session in the garage, completing just six laps and posting the slowest time.