Sebastian Vettel is confident Ferrari can find improvements overnight after ending the first day of free practice for the Belgian Grand Prix down in tenth position.

The German, winner last time out in Hungary, had a tough return to the cockpit at Spa-Francorchamps, being comfortably out-performed by Kimi Raikkonen in both sessions, while the Ferrari-powered Saubers were both quicker in FP2 too.

Though Vettel plays down the end result in a twice-interrupted session, he suggests there will be much to evaluate overnight as he 'doesn't want to be tenth in qualifying'.

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"It was not the best day for us, a bit difficult to find the rhythm but I think tomorrow we can make a step forward," he said. "We have to as well because we don't want to be tenth. I'm quite confident we can tune the car because today I was not entirely happy. Tomorrow should be a better day."

Reflecting on Nico Rosberg's dramatic high-speed tyre failure during FP2, the four-time champion was perplexed by the unusual blow-out but will wait for more information.

"Generally they should be, you know we're not in the desert, it's not hot. I don't know what happened to Nico. Obviously we will have the drivers briefing and then I think we'll use that to talk about it and explain what happened.

"By then hopefully, we should have more of an understanding if there was something wrong, if he went wide or if there was some damage prior to the tyre exploding."