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Sebastian Vettel set the fastest time during final practice for the Singapore Grand Prix.
Vettel finished almost two tenths of a second clear of Lotus's Romain Grosjean during the qualifying simulations towards the closing stages of the session.
Vettel was among many drivers to find over two seconds on the option tyres, compared to their pace on the prime compound.
Nico Rosberg was third, ahead of Mark Webber and Lewis Hamilton.
Ferrari's struggles continued as Fernando Alonso was over a second down on Vettel's time in sixth, while Felipe Massa rounded out the top 10.
Sergio Perez was seventh, ahead of Nico Hulkenberg and Jenson Button.
Paul di Resta was the only...
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