Nico Rosberg set the quickest time during the first practice session for the Singapore Grand Prix, as day turned into night at Marina Bay.
Rosberg, who has had his fourth power unit fitted this weekend, spent the entirety of the session atop the table and gradually lowered his time, ending with a 1:47.995.
Rosberg’s time proved to be three-tenths of a second quicker than Mercedes team-mate Lewis Hamilton, who had a couple of wide moments during the session.
Daniel Ricciardo finished narrowly behind Hamilton in third place as he displayed the pace of the Red Bull RB11.
Ferrari claimed fourth and fifth, with Sebastian Vettel in front of Kimi Raikkonen, despite the German driver having to find reverse gear after failing to negotiate Turn 4.
Valtteri Bottas was sixth for Williams, ahead of Toro Rosso rookie Max Verstappen.
Nico Hulkenberg placed eighth in the Force India, ahead of Carlos Sainz Jr. and Pastor Maldonado, whose session came to an early end due to a gearbox problem.
Fernando Alonso was 11th for McLaren and he was trailed by Sergio Perez, Felipe Nasr and Romain Grosjean.
Jenson Button collected 15th position, followed by Marcus Ericsson and Felipe Massa.
Daniil Kvyat was only 18th after spending time in the garage due to a fuel systems problem, while Will Stevens finished fractionally ahead of new Manor Marussia team-mate Alexander Rossi.
The session ended prematurely when debutant Rossi lost control of his Manor Marussia on the entry to Turn 18.
Rossi’s right rear made contact with the barriers before the right front also hit the wall, causing substantial damage to two corners of the car, though the front wing was intact.