Red Bull Racing confirmed on Tuesday that Sebastian Vettel has extended his multi-year contract with the team until the end of the 2015 season. Vettel, who is the three-time defending Formula One world champion, won last Sunday's Canadian Grand Prix. The 25-year-old German has won three of the first seven grand prix this season and holds a commanding 36-point lead over Fernando Alonso from Ferrari. Prior to the start of the 2011 seas
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