Nico Rosberg was fastest in the second practice session for the Singapore Grand Prix, but team-mate Lewis Hamilton's running was cut short by a reliability concern.
After Red Bull topped the opening session it was Rosberg who was fastest on the ultrasoft tyre in FP2, leading Raikkonen by 0.275s. Three teams were covered by less than 0.4s, with Max Verstappen third and team-mate Daniel Ricciardo just 0.405s adrift in fourth. Unlike the opening session, the times were comparable as all set their fastest laps on the ultrasoft tyre.
It was far from a smooth session for the Red Bulls, with Verstappen - who has an upgraded Renault power unit this weekend - complaining he wasn't getting a worthwhile long run due to traffic, while Ricciardo was lucky to escape a spin early in the session. The Australian clipped the wall at Turn 11 with his left rear tyre and spun but stopped short of the barrier on the inside of the track.
Championship leader Hamilton was not so lucky as he completed just ten laps and was seventh quickest when he returned to the pits to have an hydraulic alert investigated by Mercedes. The team discovered the problem could not be resolved in time to get the car back on track during the remainder of the session.
Sebastian Vettel and Nico Hulkenberg separated Hamilton from the top four, with Vettel a second off the pace as he was unable to match Raikkonen's time on the ultrasoft tyres. It was not a representative lap from the four-time world champion, as he ended the session just 0.021s clear of the Force India.
The two Toro Rossos remained in the top ten, with Carlos Sainz eighth ahead of Fernando Alonso and Daniil Kvyat. In a role reversal of the opening session it was Sainz of the two Toro Rossos who made an error, following Alonso in running wide at Turn 10 and hitting the Tecpro barrier with his right rear wheel. Fortunately, both drivers escaped damage.
Alonso's session ended with a walk back to the pits, however, as his McLaren came to a halt at Turn 16 with a gearbox problem on his final lap.
In a session which featured a number of mistakes, Romain Grosjean suffered the most damage as he spun at the final corner. Grosjean had already complained of problems with his brakes when he lost the rear of his Haas as he came through to complete a lap, spinning backwards into the wall and damaging his rear wing. The Frenchman needed a new rear wing and floor after the incident, which Haas could not fit in time for him to return to the track after 12 laps.
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| Pos | Driver | Team | Time | Laps |
|---|---|---|---|---|
| 01 | Nico Rosberg | Mercedes | 1:44.152 | 34 |
| 02 | Kimi Raikkonen | Ferrari | 1:44.427 | 34 |
| 03 | Max Verstappen | Red Bull | 1:44.532 | 29 |
| 04 | Daniel Ricciardo | Red Bull | 1:44.557 | 26 |
| 05 | Sebastian Vettel | Ferrari | 1:45.161 | 33 |
| 06 | Nico Hulkenberg | Force India | 1:45.182 | 35 |
| 07 | Lewis Hamilton | Mercedes | 1:45.275 | 10 |
| 08 | Carlos Sainz | Toro Rosso | 1:45.507 | 33 |
| 09 | Fernando Alonso | McLaren | 1:45.779 | 30 |
| 10 | Daniil Kvyat | Toro Rosso | 1:46.029 | 35 |
| 11 | Sergio Perez | Force India | 1:46.063 | 26 |
| 12 | Jenson Button | McLaren | 1:46.574 | 30 |
| 13 | Esteban Gutierrez | Haas | 1:46.727 | 36 |
| 14 | Felipe Massa | Williams | 1:46.856 | 30 |
| 15 | Valtteri Bottas | Williams | 1:46.960 | 30 |
| 16 | Kevin Magnussen | Renault | 1:47.161 | 30 |
| 17 | Jolyon Palmer | Renault | 1:47.166 | 34 |
| 18 | Felipe Nasr | Sauber | 1:47.531 | 29 |
| 19 | Romain Grosjean | Haas | 1:48.391 | 12 |
| 20 | Marcus Ericsson | Sauber | 1:48.487 | 32 |
| 21 | Pascal Wehrlein | Manor | 1:48.505 | 33 |
| 22 | Esteban Ocon | Manor | 1:48.823 | 29 |
