Jenson Button entered the 2010 Formula One season as the Reigning and Defending drivers world champion because he had won the 2009 drivers title. Sebastian Vettel won the drivers world title in the 2010 season from Fernando Alonso by just 4 points. Vettel has been the defending world champion ever since because he won the titles 3 consecutive times in 2010, 2011 and 2012.
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