Getty Images Enlarge Red Bull team principal Christian Horner says a number of factors have contributed to Sebastian Vettel's disappointing performances this year, including fatigue from five years of fighting for the title. The defending four-time champion has scored 88 points this year, but has struggled to match the performances of his new team-mate Daniel Ricciardo who has scored 131. Horner said the energy exerted in the past five years - in which Vettel won four titles - has taken its toll on his driver, who has also struggled to adapt to the new regulations. "It is a combination of several things," Auto Bild Motorsport and Reuters reported Horner as saying. "First,...
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