LONDON: Formula One world champion Sebastian Vettel extended his contract with Red Bull until the end of the 2014 season Monday. The deal for the sport's youngest ever champion should end speculation that he could defect to Ferrari. “The reason why I'll stay until 2014 with Red Bull Racing is that I feel very comfortable in the team,” Vettel said. The German, who captured his first world title by winning the Abu Dhabi GP in November, agreed to the new deal while preparing for the season-opening Australian GP in Melbourne on March 27.