Sebastian Vettel said he wasn't getting carried away with the results of Friday practice in Singapore, despite topping the times in both for Red Bull.

The defending champion was the man to beat under the city lights as he ended up clear of the McLaren of Jenson Button.

However, Vettel said he wasn't going to get carried away by his performance, with little to be told from the results of the two Friday sessions.

"This is a tough circuit for drivers and cars," he said. "Overall we can be happy with today, but let's see what we do tomorrow, it's still Friday and today's results are not so conclusive as some drivers got stuck in traffic etc.

"Most important is that the car seemed to work on either tyre, so we go from there. The kerbs have been changed this year, which is an improvement."

Team-mate Mark Webber was also pleased with the day having ended up with the fourth quickest tiem, although he too said that it was is still to come that matters most.

"The second session was useful today," he said. "I had a good feeling with the car and we seem to be more competitive here. We need to keep chipping away, also because the track will change a bit by tomorrow, so we need to be ready for that, but a solid start.

"I think we can be strong on Sunday, we need to execute a clean Saturday first, but so far so good."