Sebastian Vettel has said it is "impossible" for him to have expectations of a fifth straight title this season given the problems Red Bull have been experiencing during testing.Vettel was speaking on Saturday evening after the World Champions' most difficult session yet. The sum total of running was just four corners of the Bahrain International Circuit before his car broke down. Worse was to follow just a little while later when it stopped again - this time at the end of the pit lane. With an air of resignation, the World Champion helped push his RB10 back to Red Bull's garage, where it stayed for the rest of the day. With team boss Christian Horner telling Sky Sports News that...
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