Sebastian Vettel says he is expecting a 'tough job' to convert his surprise pole position for the Singapore Grand Prix into a third win of the season, believing Mercedes, Red Bull and also Kimi Raikkonen to pose a threat.

The German notched up Ferrari's first F1 pole position since 2012 - and its first dry pole since 2010 - with a masterful performance that harked back to the days of his dominance in qualifying as a Red Bull driver.

Commanding a significant advantage over the competition, though Vettel now heads into the Singapore race as a clear favourite having already won two races from less favourable positions this year, he is refusing to discount the challenge posed by the erstwhile dominant Mercedes', not to mention the Red Bulls.

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"I am sure the Mercedes will be quick tomorrow and everything else would be a surprise - it is already a bit of a surprise - and the Red Bulls of course. Tough job.

"We always try to improve and we hope that we can show the exact same result in the race or with both of us being one-two - without being too greedy! Then you can say that we have improved but I think we generally feel okay on this track and it's about feeling and confidence.

Vettel also suggests team-mate Kimi Raikkonen, who starts third, could also mount an opposition to his victory hopes if he can get more comfortable with the Ferrari.

"I think it was fairly close all weekend between Kimi and myself and in qualifying the gap seemed to increase. I think he explained that he wasn't comfortable and that's where a lot of lap is because if you feel confident with the car you can attack and there is no room for error. It can easily make a big difference."