Caterham owner Tony Fernandes triggered speculation about the future of his tail-end Formula One outfit on Friday after declaring "F1 hasn't worked" on Twitter before closing his account. The team have not scored a point in various guises since entering the sport in 2010 and the Malaysian said in January that he could quit if they did not show signs of improvement. If anything they have gone backwards since, rooted to the bottom of the standings while rivals Marussia, who also entered in 2010 as Virgin Racing, scored their first ever points in Monaco in May. There have been plenty of rumours about Fernandes' Formula One intentions with Caterham issuing a statement in May to deny...
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