Part of Sebastian Vettel's struggle so far in 2014 is "fatigue" after four consecutive world championship triumphs.
That is the view of Gerhard Berger, a former Ferrari and McLaren driver but also someone who knows Vettel well, having given the German his first full-time F1 seat in 2008 when a Toro Rosso co-owner.
So far in 2014, wearing the coveted number '1' on his Red Bull for the fourth consecutive time, Vettel has usually struggled even to match the pace of his fresh-faced new teammate Daniel Ricciardo.
"You have to congratulate Ricciardo," Austrian Berger told APA news agency. "He does an excellent job, and so consistently right from the start which is not...
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