Sebastian Vettel is refusing to weigh-in on his chances of defending his title as Red Bull's troubled pre-season draws to a close. The reigning World Champions have struggled throughout testing with the RB10's longest run to date being a 20-lap stint done by Daniel Ricciardo on Friday in Bahrain. That day also saw the team finish third on the timesheets, an encouraging result for Red Bull. However, a day later the RB10 did not even manage a single lap as Vettel broke down twice; first on his installation lap and later in the pit lane as he attempted another run. The team's woes have led to speculation that Vettel's days as World Champion could be numbered. The German, though, says it is...
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