Sebastian Vettel's former boss thinks the four times world champion may soon run out of patience for Ferrari and the political pressure that is part of driving for the Scuderia. Christian Horner, who oversaw Vettel's four consecutive world championships for Red Bull, told Sport Bild that he senses a lack of calm in the 29-year-old's current disposition. 'I have the feeling that Seb is a bit rattled,' Red Bull team boss Horner told the German newspaper. 'I know from personal experience that he has to feel good in order to perform well. And I'm not sure whether he likes Sergio Marchionne's pressure.' 'I can well imagine that in 2018 Seb will switch to Mercedes if he doesn't start making...
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