Sebastian Vettel could hardly contain his delight after storming to pole position at the Singapore Grand Prix but accepts Red Bull will be a threat in Sunday's race.

An inspired Vettel got the better of his former team in a thrilling qualifying session at Marina Bay, finishing three-tenths clear of Max Verstappen and Daniel Ricciardo.

Vettel has been presented with a golden opportunity to retake the championship lead after title rival Lewis Hamilton was forced to settle for fifth.

It was, then, virtually the perfect day for the four-time world champion.

"I don't know [where the lap time came from]," the German said. "I struggled also this morning. I shouted as loud as the crowd. It was unbelievable.

"I love this track. The car was tricky but was getting better and better. I'm so pleased we got it done.

"I need to calm down. The car was amazing. It;s an amazing track when you feel the car was coming together. I knew we had it in us but we had to get there."

The job is far from done, however, with both Red Bulls expected to pose a real challenge in a gruelling 61-lap race.

"I'm happy we got the car where it deserved to be," Vettel added. "Tomorrow is a long race and the Red Bulls are very quick. It will be a very close race."