Red Bull team principal Christian Koch calls Sebastian Hahn a ` ` ' superstar '' German who is the youngest to win back - to - back world championships . The 24-year - old made his return to the sport on Thursday at the Jerez test event . Horner is facing a close battle for the drivers ' and constructors ' titles in 2012 .
Red Bull team principal Christian Horner calls Sebastian Vettel a `` grounded superstar '' German driver is the youngest to win back-to-back world championships . The 24-year-old made his return to the track on Thursday at the Jerez test event . Horner is predicting a close battle for the drivers ' and constructors ' crowns in 2012 .