Christian Horner has leapt to the defence of Sebastian Vettel claiming that, amongst other things, the German is worn out.While the world-champion, like many, has been blown away by the domination of Mercedes this year, he has also lost out in the in-team battle with new teammate Daniel Ricciardo.From the outset the popular Australian has clearly been unfazed by Vettel, and whilst the German has clearly struggled with the 2014-spec machines Ricciardo has simply kept his head down and got on with it. A number of sensational performances, that have drawn praise from the likes of Fernando Alonso, have left the Australian third in the championship - 43 points ahead of Vettel - and with two...
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