Red Bull team boss Christian Horner believes the exertions of the past few seasons, among other things, have taken its toll on Sebastian Vettel. Having won four consecutive World Championships, Vettel was expected to once again be challenging for top honours this campaign, but he has been outshone by new team-mate Daniel Ricciardo. Horner says battling for the title for several years has played a role while he feels the new regulations have also made the 27-year-old's life difficult. "It is a combination of several things," he told 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...
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