Lewis Hamilton became the third different pacesetter in Singapore Grand Prix practice as he topped the final hour of running before qualifying determines the grid for Formula One's second night race.

The Briton overcame a trip down one of the Marina Bay circuit's many escape roads to post a lap of 1min 47.632secs, nearly a second quicker than Friday's fastest man, Sebastian Vettel, had managed on the opening evening of action to lead the way by nearly three-tenths.

Vettel continued to feature among the frontrunners, only losing top spot to Hamilton late in the hour, and was the only other driver to lap in the 1min 47secs bracket, although the top seven drivers all lapped quicker than the German had managed on day one.

That group included 2008 race runner-up Nico Rosberg, the second McLaren of Heikki Kovalainen, the BMW Saubers of Robert Kubica and Nick Heidfeld and the best of the Brawns, driven by FP1 pacesetter Rubens Barrichello. The quintet was covered by a smaller margin than split Hamilton from Vettel, and each had the opportunity to go faster. Kovalainen, in particular, could have made up places had he not got an otherwise faster lap wrong in the final third, while Barrichello showed his displeasure after being distracted by Romain Grosjean. Eighth-placed Timo Glock was also dissatisfied, slowly running Rosberg out wide in the harbour-front section after apparently being held up by his fellow German.

Toro Rosso's Sebastien Buemi and the second Toyota of Jarno Trulli rounded out the top ten, but there was frustration for title contenders Mark Webber and Jenson Button, who posted best laps of 1min 48.876secs and 1min 48.921secs respectively in 13th and 14th positions. 2008 race winner Fernando Alonso was 15th.