Red Bull Racing's Sebastian Vettel believes Mercedes will be 'very strong' in qualifying on Saturday for the Singapore Grand Prix.

Vettel was 'only' third in opening practice, but came to the fore again in the second session, posting a 1 minute 44.249 second lap, which put him 0.604 seconds up on team-mate, Mark Webber and 1.009 seconds up on Nico Rosberg, who led the challenge for Mercedes.

Despite such domination, however, Vettel doesn't believe the time is 'completely representative' and is wary of the threat posed by Rosberg and Lewis Hamilton.

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"It was quite busy [on track today]; it's pretty hot out there, good fun and a nice place, but for all of us it's quite hard work," Vettel said.

"The time we set was a surprise, I got a good lap in, but I don't think it's completely representative. We seem to be quick, but I think Mercedes will be very strong in qualifying tomorrow."

Asked about the changes made at the widely-disliked Singapore Sling chicane at turn ten, Vettel added: "I think Turn 10 is the best solution we have with the space that's available."

Webber meanwhile also reckons the alterations made are pretty good: "Turn 10 is better now I think," he remarked.

As for his own day, Webber was reasonably pleased, and he made no mention of his brush with the wall in P2. "We got most of the work done today that we planned to. It's an easy venue to not get what you want, but in the end I think we've got a reasonable set-up," he continued.

"We've got work to do on the long run and also on the short run, you can't neglect that. We won't count our chickens yet, but it was a smooth day."