Webber keeps Red Bull on top in final practice in Singapore

Webber's time of 1m46.081s put him just 0.027 seconds ahead of McLaren's Jenson Button, who bounced back following a difficult Friday.

Vettel, favourite for another pole position, had a low-key session and finished in third, over two tenths of a second behind Webber. The German, however, was hit by traffic during his best laps.

Fernando Alonso, a two-time winner in Singapore, put his Ferrari in fourth place, with Lewis Hamilton down in fifth place in the second McLaren. The Briton, however, was nearly a full second off the pace after damaging his car's floor when going over the kerbs during the final moments of the session.

Virgin's Jerome D'Ambrosio set the first time of the session after some 12 minutes, while all the other drivers settled for installation laps in the opening part of final practice.

Kamui Kobayashi moved to the top of the times some two minutes later, with the rest of the field starting to complete timed laps.

Button was the first of the frontrunners to complete a full lap, the Briton stopping the clock at 1m50.707s, the McLaren driver improving by over a second as he continued with his run. Button continued to stretch his gap for a few laps, posting a 1m48.412s that left him over 1.5 seconds clear of the field at the 30-minute mark.

Vettel shot to the top of the times with less than half the session to go, the world champion posting a 1m47.737s with the soft tyre compound. Alonso moved to second with a lap very much on the limit, the Spaniard having already survived a scare during his previous lap.

Vettel improved even further to stop the clock at 1m47.064s, with Michael Schumacher outpacing Alonso to jump up to second place with 20 minutes left.

Nico Rosberg was the first of the frontrunners to try the supersoft rubber, the German posting the second quickest time with around 12 minutes to go.

Despite brushing the wall, Alonso went quickest during his first run with the softer rubber, the Spaniard bettering Vettel's time by over six tenths of a second. Button was next to complete his super soft-tyre run, posting a 1m46.108s that put him on top.

The Briton was soon relegated, however, when Webber went quicker by 0.027s. Team-mate Vettel had to settle for third position in his first run with super softs after finding traffic during his lap. The world champion went for another run with the same set of tyres but decided to abort it in the end.

Pos  Driver                Team                   Time              Laps
 1.  Mark Webber           Red Bull-Renault       1m46.081s           15
 2.  Jenson Button         McLaren-Mercedes       1m46.108s  + 0.027  17
 3.  Sebastian Vettel      Red Bull-Renault       1m46.345s  + 0.264  14
 4.  Fernando Alonso       Ferrari                1m46.396s  + 0.315  14
 5.  Lewis Hamilton        McLaren-Mercedes       1m46.936s  + 0.855  20
 6.  Nico Rosberg          Mercedes               1m47.831s  + 1.750  14
 7.  Michael Schumacher    Mercedes               1m47.837s  + 1.756  12
 8.  Felipe Massa          Ferrari                1m48.711s  + 2.630  12
 9.  Kamui Kobayashi       Sauber-Ferrari         1m49.057s  + 2.976  15
10.  Adrian Sutil          Force India-Mercedes   1m49.304s  + 3.223  16
11.  Sergio Perez          Sauber-Ferrari         1m49.583s  + 3.502  17
12.  Sebastien Buemi       Toro Rosso-Ferrari     1m49.679s  + 3.598  18
13.  Paul di Resta         Force India-Mercedes   1m49.816s  + 3.735  18
14.  Pastor Maldonado      Williams-Cosworth      1m49.851s  + 3.770  17
15.  Rubens Barrichello    Williams-Cosworth      1m50.189s  + 4.108  15
16.  Vitaly Petrov         Renault                1m50.229s  + 4.148  15
17.  Bruno Senna           Renault                1m50.523s  + 4.442  14
18.  Jaime Alguersuari     Toro Rosso-Ferrari     1m50.547s  + 4.466  17
19.  Heikki Kovalainen     Lotus-Renault          1m52.510s  + 6.429  17
20.  Jerome D'Ambrosio     Virgin-Cosworth        1m52.697s  + 6.616  19
21.  Daniel Ricciardo      HRT-Cosworth           1m53.728s  + 7.647  17
22.  Jarno Trulli          Lotus-Renault          1m53.823s  + 7.742  18
23.  Timo Glock            Virgin-Cosworth        1m53.829s  + 7.748  16
24.  Tonio Liuzzi          HRT-Cosworth           1m55.203s  + 9.122  17

All Timing Unofficial