Within touching distance of its fourth consecutive Constructors' Championship, Red Bull refuses to relax as the season begins to draw to a close.A dominant Singapore performance from Sebastian Vettel, himself with one hand on a fourth Drivers' Championship, allowed the team to extend its points lead to 103 with just six races remaining. It could have been more but for an engine failure for Mark Webber on the last lap while running fourth.'You can't become complacent in any way,' team boss Christian Horner insisted after the race. 'We never have yet and we certainly won't this year.'We've had two bloody close (championships) that I don't want to go through again,' he laughed. 'Brazil last...
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