After earlier rain the opening Friday practice for the 2012 Singapore Grand Prix would be declared wet with the track damp in places. The drivers would come out for their installation laps with there been a mixture of the intermediate and full wet weather tyre been used. For the Williams F1 team both Pastor Maldonado and Bruno would complete one lap prior to pitting. Perez would return to the track running on the intermediate tyre but he would pit leaving the track empty. Next to come back out were the Marussia's of Glock and Pic. Webber would also come out while the weather reports had more rain on its way. Glock, Pic, and Webber were all on intermediates as Pic pitted briefly. Perez was also back out while Webber had pitted.

Glock would set a 2m:24.476 while Pic would pit again. Bruno was in his car putting his helmet back on as Kobayashi and Ma, driving for HRT, would come out. Glock would pit while shortly after Rosberg, Vettel, and Petrov would take to the track. More drivers would start to come out with Vergne joining the track. Kobayashi would pit as Hamilton left his pit. Petrov had pitted to swap over to the intermediate tyre. Di Resta was next out joined by Grosjean. Vergne would set a 2m:09.854 to go fastest. Hamilton was out on the soft tyre as De la Rosa set a 2m:11.172. Vergne would improve with a 2m:04.866. The next group of drivers to come out included Ricciardo, Hulkenberg, and Alonso while Hamilton pitted.

Grosjean was now second with a 2m:05.130 as Kobayashi also came back out. Vettel would pit while at the front Grosjean would go fastest with a 2m:03.568. Hulkenberg would go fastest with a 2m:02.852 with Ricciardo moving into second. Grosjean was now third with Alonso fourth, 2m:04.068. Alonso was on a quick lap as Hulkenberg pitted. Alonso would complete his lap setting a 2m:01.573 to go fastest. Hulkenberg would return after a brief stop while Grosjean pitted. Kobayashi would go fastest with lap of 2m:01.030. We now had Raikkonen and both Caterham's out on the track. Alonso and Hulkenberg would pit as Kobayashi set a 1m:58.550 showing that the dry tyre was quicker. For Williams Bruno would be first out joined by Rosberg, Schumacher, Webber, and Hamilton. Bruno was on the soft tyre while at the front we would have Rosberg, 1m:58.693, and Schumacher, 2m:01.055, second and third. Kobayashi would improve with a 1m:54.017. Bruno's first lap would see him set a 2m:02.968.

Pastor was now also back out on the track also on the soft tyre. Bruno's next lap would see him set a 1m:59.447. Schumacher had improved with a 1m:56.834 but remained third. Bruno would also improve to move up one spot with a 1m:56.560 but Schumacher would take this spot back. Alonso was back out currently fifth as Button moved up to sixth, 2m:01.890. Kobayashi had pitted after his first run. Raikkonen was now up to fifth, 1m:59.726, as Pastor started his first timed lap. Rosberg was on a quick lap as Button moved up to fourth, 1m:55.493. Bruno was now fifth as Pastor finished his lap setting a 1m:59.221 to be seventh just behind Perez. Rosberg would finish his lap with a 1m:53.416 to be fastest. Hulkenberg was back up to third but both Pastor and Perez would improve. Perez was now second, 1m:54.009, and Pastor fifth, 1m:54.522. Bruno had dropped to eighth followed by Raikkonen, Vettel, Vergne, and Alonso twelfth. Quickly Bruno would drop to twelfth as drivers improved their times.

Button was now second, 1m:53.862, followed by Perez, Kobayashi, Schumacher, Hulkenberg, Pastor, Grosjean, Massa, Vergne, and Bruno now thirteenth. The times continued to fall as Raikkonen went fastest with a 1m:53.268 with Perez second and Hulkenberg now third, 1m:53.348. Massa was now up to second, 1m:53.080, but quickly Perez would go fastest with a time of 1m:52.296. But Vettel would also improve to be fastest with a 1m:51.986 but again his time would be beaten this time by Hulkenberg, 1m:51.864. Pastor would also find time setting a 1m:51.576 to be fastest from Hulkenberg and now Hamilton. Vettel and Perez had both pitted while Bruno was on a quicker lap setting a 1m:52.629 to be tenth. Vettel would come back out with just under thirty minutes remaining. Di Resta would join Hulkenberg near the front going third with a 1m:51.963. Hulkenberg would improve with a 1m:51.858 but remained second.

But Webber would take second with a time of 1m:51.655 while team-mate Vettel would go fastest with a 1m:51.367. Bruno had pitted as Hamilton moved ahead of Vettel with a 1m:51.172. Pastor would also pit with the order now Hamilton from Vettel, Pastor, Webber, Hulkenberg, Di Resta, Perez, Button, Ricciardo, and Bruno tenth. The reports how had the rain holding off til after the end of the session. Alonso was back out currently second slowest. Schumacher was also out on the track currently in fourteenth but he would improve to be twelfth, 1m:52.986. Bruno would come back out for his second run with the track fairly quite. Twenty minutes remaining and Vettel would improve with a 1m:50.566 to again be fastest. Alonso was now eighth with a 1m:52.291 but his next lap would see him seventh, 1m:52.011. Pastor was back out on the track joined by Hulkenberg. Vettel would pit while for Pastor he would lock up running off into an escape area at Turn nine where he would reverse his car returning to the track.

The track would again be very busy with ten minutes remaining. Alonso had moved up to third with a 1m:51.525 while Webber was fifth from Hulkenberg, Di Resta, Ricciardo, Perez, Button, and Bruno now eleventh. Vettel was back out but Hamilton remained in his pit. As the final minutes counted down Alonso would pit joining Hamilton. Alonso would quickly return as both Ricciardo and Glock pitted. Ricciardo also returned quickly as Perez had a big slide taking to the escape road at Turn nine. He was able to continue as at the front Button would improve with a 1m:51.459. The session would end with Pastor fifth and Bruno eleventh. Fastest was Vettel from Hamilton, Button, Alonso, Pastor, Webber, Hulkenberg, Di Resta, Ricciardo, and Perez tenth. Apart from one small off it was an uneventful session for the Williams team as they worked through their schedule. Pastor would say at the end of the session that his car felt good.

Pos  Driver         	 Team		       Time      Laps
 1.  Sebastian Vettel    Red Bull-Renault      1m50.566  24
 2.  Lewis Hamilton      McLaren-Mercedes      1m50.615s 15
 3.  Jenson Button       McLaren-Mercedes      1m51.459s 17
 4.  Fernando Alonso     Ferrari               1m51.525s 20
 5.  Pastor Maldonado    Williams-Renault      1m51.576s 20
 6.  Mark Webber         Red Bull-Renault      1m51.655s 19
 7.  Nico Hulkenberg     Force India-Mercedes  1m51.658s 24
 8.  Paul di Resta       Force India-Mercedes  1m51.943s 21
 9.  Daniel Ricciardo    Toro Rosso-Ferrari    1m52.275s 24
10.  Sergio Perez        Sauber-Ferrari        1m52.296s 19
11.  Bruno Senna         Williams-Renault      1m52.629s 25
12.  Kimi Raikkonen      Lotus-Renault         1m52.716s 16
13.  Kamui Kobayashi     Sauber-Ferrari        1m52.839s 23
14.  Michael Schumacher  Mercedes              1m52.986s 21
15.  Romain Grosjean     Lotus-Renault         1m53.028s 20
16.  Felipe Massa        Ferrari               1m53.080s 17
17.  Jean-Eric Vergne    Toro Rosso-Ferrari    1m53.189s 25
18.  Nico Rosberg        Mercedes              1m53.227s 25
19.  Timo Glock          Marussia-Cosworth     1m54.908s 20
20.  Heikki Kovalainen   Caterham-Renault      1m55.091s 16
21.  Charles Pic         Marussia-Cosworth     1m55.335s 22
22.  Vitaly Petrov       Caterham-Renault      1m55.760s 22
23.  Pedro de la Rosa    HRT-Cosworth          1m56.656s 21
24.  Ma Qing  Hua        HRT-Cosworth          1m58.053s 20