Sebastian Vettel led Kimi Räikkönen to a Ferrari 1-2 in final practice for the Singapore Grand Prix as Mercedes once again slipped down the order, with Lewis Hamilton and Nico Rosberg finishing in fifth and sixth places respectively.

Third place went to Friday evening’s fastest man Daniil Kvyat, with his Red Bull Racing team-mate Daniel Ricciardo in fourth ahead of the Mercedes pair, who were both over a second adrift of Vettel.

In the opening phases of the session, on the prime soft tyre, Vettel was comfortably quickest, with the German jumping to the top of the timesheet after 24 minutes with a lap of 1:46.728 that put him almost a second clear of previous P1 man Kvyat. Räikkönen then stole into P2 though he was only marginally quicker than the Russian Red Bull driver.

Kvyat bounced back to reclaim P2 with a time of 1:47.249 that left him half a second down on Vettel and then Ricciardo further separated the Ferraris by claiming P3 with a lap two tenths adrift of his team-mate.

As the field headed back to the pit lane to make the switch to the supersoft tyres Rosberg was the quickest of the Mercedes drivers, in fifth spot, though he was 1.163s down on Vettel's time. Hamilton was just under a tenth further back in sixth. 

Ricciardo was the first of the front runners to make a move on the supersoft, with the Australian claiming P1 by 0.369s as he benefited from the better grip on offer. Raikkonen quickly bypassed Ricciardo with a lap of 1:46.132 and then Vettel set the session’s ultimate benchmark with a lap of 1:45.682 that left him almost half a second clear of Räikkönen. Vettel was the only driver to break the 1m46s barrier during the session.

Hamilton and Rosberg, meanwhile, were visibly struggling for pace with Hamilton in fifth by 1.1s and Rosberg a further four tenths of a second back, in sixth place. The Mercedes response was telling: “No disguising the potential here,” the team admitted, “the pace of our rivals is genuine and very quick.”

After finishing FP2 in eighth place yesterday, Fernando Alonso went one better for McLaren in final practice and the Spaniard ended the session just one hundredth of a second behind Rosberg as the power deficit of the team’s Honda engine was partially eradicate on the street circuit.

Alonso was followed, in P8, by compatriot Carlos Sainz whose best lap for Toro Rosso was a 1:47.301, justy over six hundredths of a second down on two-time Singapore Grand Prix winner Alonso.

Ninth place in the session went to Sainz’s team-mate Max Verstappen and the top 10 order was completed Sauber’s Marcus Ericsson who was just under two seconds off Vettel’s blistering pace.

2015 Singapore Grand Prix – Free Practice
1. Sebastian Vettel Ferrari 1:45.682s
2. Kimi Raikkonen Ferrari 1:46.132s
3. Daniil Kvyat Red Bull 1:46.167s
4. Daniel Ricciardo Red Bull 1:46.359s
5. Lewis Hamilton Mercedes 1:46.802s
6. Nico Rosberg Mercedes 1:47.223s
7. Fernando Alonso McLaren 1:47.237s
8. Carlos Sainz Jr Toro Rosso 1:47.301s
9. Max Verstappen Toro Rosso 1:47.464s
10. Marcus Ericsson Sauber 1:47.568s
11. Valtteri Bottas Williams 1:47.587s
12. Nico Hulkenberg Force India 1:47.640s
13. Jenson Button McLaren 1:47.715s
14. Felipe Massa Williams 1:47.733s
15. Pastor Maldonado Lotus 1:47.817s
16. Sergio Perez Force India 1:48.002s
17. Romain Grosjean Lotus 1:48.116s
18. Felipe Nasr Sauber 1:48.932s
19. Alexander Rossi Manor 1:52.588s
20. Will Stevens Manor 1:55.293s

Full event timing details are available here