Nico Rosberg topped the times ahead of his Mercedes teammate Lewis Hamilton in yesterday's rain-hit opening free practice session for this weekend's Brazilian Grand Prix.
The 28-year-old German clocked a best lap time of one minute and 24.781 seconds at the spectacular Interlagos circuit early in the 90 minutes' action and, as the rain intensified, it proved to be untouchable.
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Briton Hamilton, the 2008 world champion, was second in 1:25.230 ahead of four-time world champion German Sebastian Vettel of Red Bull and the 2009 champion Jenson Button of McLaren.
Two-time champion Fernando Alonso of Ferrari was fifth-quickest ahead of his friend, retirement-bound Australian Mark Webber, who competes in his final race with Red Bull this weekend.
Mexican Sergio Perez, in his last weekend with McLaren, was seventh ahead of impressive 19-year-old Russian rookie Daniil Kvyat, running for Toro Rosso ahead of his move to replace Red Bull-bound Australian Daniel Ricciardo next season.