Having claimed the fastest time of day one on the streets of Singapore, Sebastian Vettel ensured that Red Bull Racing continued to live up to its billing as pre-race favourite by setting the pace in the final free practice session as well.
As had been the case on Friday, the action began on a circuit still wet from a downpour earlier in the day, with the track surface refusing to dry completely as the city-state lumbered under 80 per cent humidity despite the late hour. The damp patches, plus wet kerbs and artificial turf beyond the track, all caught drivers unawares as they attempted to explore the limits in preparation for qualifying, although there were few casualties to report.
Vettel moved to the head of the timesheets after pushing his Red Bull to a lap in 1min 48.028secs, and would have been delighted to see the rest of the field strung out behind him. A comparatively massive six-tenths separated Vettel from second-placed Fernando Alonso, with Lewis Hamilton a further three-tenths adrift after failing to join his rivals in the 1min 48secs bracket.
While Vettel appeared comfortable with his car, Red Bull team-mate - and current points leader - Mark Webber struggled to find the right set-up and languished down in sixth spot, behind both Felipe Massa and Mercedes' Nico Rosberg, with Monza nemesis Nico Hulkenberg snapping at his heels. The German edged potential dark horse Robert Kubica for seventh, while Adrian Sutil and Sebastian Buemi kept Force India and Toro Rosso in the top ten and encouraged about their qualifying chances.
Missing from the leading group was reigning world champion Jenson Button. The Briton had featured towards the top of the times early on, but was thwarted by a late yellow flag after venturing out at the end of the session in search of a better lap. Button also found himself in a closely-matched group bookended by Sutil on 1min 49.916secs and 15th-placed Michael Schumacher on 1min 50.067secs - a time the seven-time world champion shared with Jaime Alguersuari - while Vitaly Petrov and Rubens Barrichello squeezed into the gap ahead of Button.