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Defending world champion Sebastian Vettel set the early pace at the Singapore Grand Prix as he timed quickest in a damp first free practice session on Friday.
Two hours after a downpour, the Red Bull driver from Germany clocked 1min 50.566sec on the drying street circuit to overhaul McLaren's Lewis Hamilton by 0.049sec.
Hamilton's team mate Jenson Button was third quickest ahead of Ferrari's championship leader Fernando Alonso, Williams driver Pastor Maldonado and Red Bull's Australian pilot, Mark Webber.
Nico Hulkenberg, Paul di Resta, Daniel Ricciardo and Sauber's Sergio Perez rounded out the top 10 after the 90-minute session held in high humidity as dusk fell over the floodlit, downtown course.
In one of the few untoward incidents, Maldonado locked up a front wheel as he missed a sharp left-hander and ended up in a run-off area.
Ma Qinghua, who became the first Chinese driver to take part in Formula One during practice for this month's Italian Grand Prix, finished slowest of the session for Hispania.
With seven races to go, Alonso leads the standings by 37 points ahead of Hamilton, who has won two of the last three races. Lotus's Kimi Raikkonen and Vettel, bidding for a third straight title, are both close behind. - AFP
1 Sebastian Vettel (Germany) Red Bull - 1min50.566
2 Lewis Hamilton (Britain) McLaren - 1min50.615
3 Jenson Button (Britain) McLaren - 1min51.459
4 Fernando Alonso (Spain) Ferrari - 1min51.525
5 Pastor Maldonado (Venezuela) Williams - 1min51.576
6 Mark Webber (Australia) Red Bull - 1min51.655
7 Nico Huelkenberg (Germany) Force India - 1min51.658
8 Paul Di Resta (Britain) Force India - 1min51.943
9 Daniel Ricciardo (Australia) Toro Rosso - 1min52.275
10 Sergio Perez (Mexico) Sauber - 1min52.296
11 Bruno Senna (Brazil) Williams - 1min52.629
12 Kimi Raikkonen (Finland) Lotus - 1min52.716
13 Kamui Kobayashi (Japan) Sauber - 1min52.839
14 Michael Schumacher (Germany) Mercedes - 1min52.986
15 Romain Grosjean (France) Lotus - 1min53.028
16 Felipe Massa (Brazil) Ferrari - 1min53.080
17 Jean-Eric Vergne (France) Toro Rosso - 1min53.189
18 Nico Rosberg (Germany) Mercedes - 1min53.227
19 Timo Glock (Germany) Marussia - 1min54.908
20 Heikki Kovalainen (Finland) Caterham - 1min55.091
21 Charles Pic (France) Marussia - 1min55.335
22 Vitaly Petrov (Russia) Caterham - 1min55.760
23 Pedro de la Rosa (Spain) Hispania - 1min56.656
24 Ma Qinghua (China) Hispania - 1min58.053