Sebastian Vettel is constantly getting better, Red Bull boss Christian Horner warns rivals
|By Simon Strang||Saturday, January 14th 2012, 13:50 GMT|
Reigning Formula 1 world champion Sebastian Vettel will be even stronger in 2012 after becoming the youngest driver to win back-to-back titles over the past two seasons, according to his Red Bull Racing team principal Christian Horner
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