Sebastian Vettel says he is expecting a 'tight' scrap for the leading positions at the Singapore Grand Prix, following a closely contested second practice session on Friday.
Vettel was fifth fastest, less than four tenths of a second behind pace setter Daniil Kvyat, with Kimi Raikkonen, Daniel Ricciardo and Lewis Hamilton also in contention.
"The car seems to work, but other than that I think we can still improve," explained Vettel.
"I was not entirely happy with my short-runs, so for Qualifying we still have to improve a bit, but for the race it looked okay.
"The pace seems to be there, but it’s also fair to say that I haven’t seen too much of the data yet. So we will see."
Vettel is nonetheless wary that Mercedes, which had Hamilton fourth and Nico Rosberg in seventh, should make progress.
"Obviously, we can expect the Mercedes to be quick tomorrow: I don’t know what happened to them today, they looked a bit slow, but for sure they will change it for tomorrow," he warned.
"We know that the Mercedes don’t show everything on Friday, and as expected the Red Bulls are fairly quick here as well. So tomorrow it will be tight.
"I look forward to Saturday, I like the circuit, it is a big challenge: there’s a lot of corners, it is a long lap and it’s not easy to get everything right."