Sebastian Vettel reckons it will be tight on Saturday in qualifying for the Singapore Grand Prix, with his old team Red Bull Racing in the mix along with the Scuderia and of course Mercedes.

Red Bull topped the times on Friday in practice, while Kimi Raikkonen and Vettel came in second and fifth for Ferrari.

Reflecting on the day, Vettel added he is sure there is more to come from the SF15-T: "It was a good day for us, the car seems to work, but I think we can still improve," he noted.

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"I was not entirely happy with the short runs I had, so for quail we have to improve a bit. If we put all these things together, we should be a bit quicker.

"For the race, in the end it looked quite OK. I didn't see that much but the pace seemed to be there so we'll see."

Meanwhile, Vettel added that he is sure Mercedes will be back on it on Saturday, after ending FP2 'only' fifth and seventh.

"The Mercedes will be quick, I don't know what happened to them today, they looked a bit slow but I'm sure they will change it for tomorrow," Vettel continued.

"We know some of the Merc teams don't show everything on Friday so we'll see. As expected, the Red Bulls are fairly quick round here [too].

"It will be tight tomorrow."