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 of the session while Lotus repaired his E21.
The Finn lost control of his car exiting the final corner in first practice and sustained substantial damage after making contact with the barriers.
Jenson Button was the fastest McLaren driver and ended the session in ninth place.
Force India’s Adrian Sutil rounded out the top 10, a thousandth of a second ahead of team-mate Paul di Resta.
Sergio Perez was twelfth, marginally ahead of compatriot Esteban Gutierrez.
Nico Hulkenberg was fourteenth, ahead of Jean-Eric Vergne, Daniel Ricciardo, Pastor Maldonado and Valtteri Bottas.
At the back, Giedo van der Garde was four tenths of a second up on Caterham team-mate Charles Pic, who had a high speed slide at turn 9 late on in the session.
Marussia’s Jules Bianchi was a further three tenths of a second behind Pic, with the same margin separating Bianchi and his team-mate, Max Chilton.
Several drivers ran wide early on as they struggled under braking on the medium tyres.
The only other driver to come to serious grief was Marussia’s Rodolfo Gonzalez. The Venezuelan, taking part in first practice, lost control of his car exiting turn 13 and nudged the wall, wiping off his front wing.
Tyre wear did not appear to be an issue during the second practice session, with Vettel’s fastest lap time coming on his sixteenth lap on option tyres, while the prime tyres did not show significant drop off, even after over 20 laps.