– Red Bull team boss Christian Horner says Sebastian Vettel's challenging start to the 2014 season is a result of numerous factors, including fatigue in the wake of five years of fighting for world titles.Vettel, the winner of the past four Drivers' crowns, has struggled to adapt to Formula 1's latest regulation overhaul, leaving him 43 points behind new team-mate Daniel Ricciardo after the opening 11 races."It is a combination of several things," Horner explained to Germany's Auto Bild Motorsport. "First, when you have fought for the title for five years, it does wear you out a little bit, but that is not the fundamental problem."The way Sebastian brought out...
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