Sebastian Vettel is "worn out" after winning four consecutive world drivers titles to enable Red Bull to reign supreme in Formula One, according to his team chief Christian Horner. Briton Horner said that exhaustion was a part of the explanation for the 27-year-old German's loss of form in a season dominated by Mercedes and in which his new Red Bull teammate Australian Daniel Ricciardo has out-performed him. The rest, he said, was down to the sport's radical new package of regulations this year which included a return of turbocharged engines and electronic braking systems. Ricciardo, 25, has won twice to climb to third with 131 points after 11 of the year's 19 races, trailing...
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