Mercedes AMG Petronas
Lewis Hamilton set the fastest time in both practice sessions ahead of this weekend's Korean Grand Prix.
Hamilton was a tenth of a second quicker than Red Bull's Sebastian Vettel during the second 90 minute session.
Nico Rosberg was third, with Mark Webber in fourth.
Webber, whose most recent pole position came at the circuit 12 months ago, will drop 10 places on the grid following his third reprimand of the year in Singapore.
Lotus and Ferrari were unable to match the frontrunners over a single lap on option tyres.
Felipe Massa finished fifth, ahead of Romain Grosjean and Fernando Alonso.
Kimi Raikkonen set the eighth fastest time having missed the opening few minutes...
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