Nico Rosberg led Mercedes teammate Lewis Hamilton in the opening Friday practice session for the Singapore Grand Prix.
The German driver led from start to finish, setting the first timed lap of the day and never surrendering first position until the end of the 90 minutes of running.
Rosberg was the only driver who lapped in the 1:47s, finishing slightly over three tenths of a second ahead of Hamilton.
Red Bull's Daniel Ricciardo was a close third, lifting his hopes of a good result on a track where his team expects to be able to put on a strong showing.
Sebastian Vettel and Kimi Raikkonen were fourth and fifth fastest respectively for Ferrari ahead of the Williams of Valtteri Bottas.
Toro Rosso's Max Verstappen finished seventh, with teammate Carlos Sainz in ninth behind the Force India of Nico Hulkenberg.
Pastor Maldonado completed the top 10 in the quickest Lotus.
Hamilton took it easy at the start of the session, the Briton being the last driver to take the track to complete his installation lap.
Teammate Rosberg, on the other hand, was the first driver to complete a timed lap 12 minutes into the session, leading the way by over two seconds from his closest rival.
The world champion improved minutes later to reduce the gap to Rosberg to less than a second, as the German continued to lead the way with a lap of 1:49.184 before the half-hour mark.
Raikkonen relegated Hamilton to second briefly, before the Mercedes driver retook P2. But he'd done so only to lose the spot to Ricciardo, who posted a time 0.412 seconds slower than Rosberg before the action came to a halt as the time to run the extra set of tyres run out.
It took until nearly half the session was gone for Rosberg to set a new benchmark, the Mercedes driver posting a 1:48.004 to open the gap to Ricciardo to over 1.5 seconds at the time.
Hamilton also improved, but fell three tenths of a second short of Rosberg's time.
Red Bull's Daniil Kvyat had a fuel system problem that kept him in the garage for a long time, the Russian managing five laps early on before returning to action with just five minutes of running left.
Newcomer Alexander Rossi finished at the bottom of the times in his first outing as a Manor race driver, the American causing an early finish after crashing against the wall at Turn 18 with four minutes of the session to go.
His car was heavily damaged, but Rossi emerged unscathed. He was slowest.
|3||Daniel Ricciardo||Red Bull||1'48.331||0.336||21|
|7||Max Verstappen||Toro Rosso||1'49.466||1.471||17|
|8||Nico Hulkenberg||Force India||1'49.854||1.859||21|
|9||Carlos Sainz||Toro Rosso||1'50.019||2.024||28|
|12||Sergio Perez||Force India||1'50.125||2.130||23|
|18||Daniil Kvyat||Red Bull||1'51.188||3.193||8|