Nico Rosberg enters qualifying as a favourite for pole position after setting the fastest time in final practice for the Malaysian Grand Prix.
Rosberg finished ahead of his Mercedes Formula 1 team-mate Lewis Hamilton as the team was the class of the field in Saturday lunchtime's period.
The duo topped the timesheets throughout the hour when they were running on both the hard and medium compound tyres.
The Mercedes pair were a whole second ahead of the Ferrari of Kimi Raikkonen at a hot and overcast Sepang International Circuit.
The Ferraris were the first to switch to the medium compound tyre with just over 20 minutes of the session remaining. But their positions at the top of timing screens were shortlived once the Mercedes switched to the softer compound rubber.
Both the Red Bulls of Sebastian Vettel and Daniel Ricciardo sat out most of the beginning of the session, only coming out halfway through the hour. Vettel's late lap gave him the fourth quickest time, two positions ahead of his team-mate.
German Nico Hulkenberg impressed with the fifth fastest time on the medium compound tyres in his Force India.
It was a problematic session for McLaren, which completed the least of amount of running.
Early in the session Kevin Magnussen complained on the team radio he had suffered a loss of power with his engine. Reports suggest it was a repeat of the exhaust sensor problem he suffered on Friday morning.
And team-mate Jenson Button also spent the majority of the session in the garage, save for a couple of early installation laps.
Lotus finally got some mileage this weekend as Pastor Maldonado managed a total of 20 laps across the hour, although he and his team-mate Romain Grosjean suffered a number of off-track excursions as they struggled to dial the set-up into the car.
Pos Driver Team/Car Time Gap Laps 1. Nico Rosberg Mercedes 1m39.008s 13 2. Lewis Hamilton Mercedes 1m39.240s +0.232s 13 3. Kimi Raikkonen Ferrari 1m40.156s +1.148s 13 4. Sebastian Vettel Red Bull-Renault 1m40.387s +1.379s 14 5. Nico Hulkenberg Force India-Mercedes 1m40.523s +1.515s 15 6. Daniel Ricciardo Red Bull-Renault 1m40.686s +1.678s 14 7. Fernando Alonso Ferrari 1m40.736s +1.728s 14 8. Felipe Massa Williams-Mercedes 1m40.781s +1.773s 20 9. Valtteri Bottas Williams-Mercedes 1m40.891s +1.883s 20 10. Sergio Perez Force India-Mercedes 1m41.029s +2.021s 15 11. Daniil Kvyat Toro Rosso-Renault 1m41.182s +2.174s 18 12. Jean-Eric Vergne Toro Rosso-Renault 1m41.441s +2.433s 18 13. Adrian Sutil Sauber-Ferrari 1m41.552s +2.544s 15 14. Esteban Gutierrez Sauber-Ferrari 1m42.041s +3.033s 17 15. Romain Grosjean Lotus-Renault 1m42.749s +3.741s 16 16. Pastor Maldonado Lotus-Renault 1m43.539s +4.531s 20 17. Max Chilton Marussia-Ferrari 1m43.977s +4.969s 16 18. Jules Bianchi Marussia-Ferrari 1m44.170s +5.162s 18 19. Marcus Ericsson Caterham-Renault 1m44.457s +5.449s 12 20. Kamui Kobayashi Caterham-Renault 1m46.015s +7.007s 7 21. Jenson Button McLaren-Mercedes 2m05.555s +26.547s 4 22. Kevin Magnussen McLaren-Mercedes 5