While Westwood has to battle the nagging effects of his injury, he is still sanguine about chances at the WGC-HSBC Champions.

"I don't feel any added pressure being world number one. There's pressure but it's what you make out of it. It's unfortunate that my injury happened but you know, it's just a case of managing it at the moment and edging my way through," said Westwood.

Westwood will be playing alongside Asian Tour honorary member Y.E Yang and Mickelson who has signalled his intent of defending his title strongly.

"I've been fortunate to win this tournament and I look forward to playing it every year. I feel like I can put together a good week here and compete for the title," said Mickelson who is making his fourth consecutive appearance in the event that he has won in 2007 and 2009.

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