Lewis Hamilton concedes Mercedes have a long night ahead as the team needs to improve ahead of Saturday's qualifying in Singapore.
Having topped Friday evening's session, much was expected from Hamilton and his Mercedes team.
However, in the night session, which only began at 9:30pm under lights, the Brit was trounced by Sebastian Vettel and Red Bull Racing.
The German posted a 1:44.249 to beat the Mercedes drivers by a full second as they lined up three and fourth behind the Bulls.
Hamilton, though, says all is not lost as Mercedes know where they need to improve ahead of Saturday night's qualifying.
"It wasn't the perfect Friday for us but we got on with our programme and know where...
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