Japanese GP: Red Bull boss Horner says Vettel 'fancied new challenge'
Team Principal Christian Horner says Sebastian Vettel "fancied a new challenge" after announcing he would be leaving Red Bull Racing at the end of the season.
Since joining Red Bull team in 2009, Vettel has scored 38 wins, 44 poles and four drivers' world championships.
The German will be replaced at Red Bull by Russian Toro Rosso driver Daniil Kvyat.
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