Kaymer and Phil Mickelson could all make Westwood's reign at the top a
matter of days rather than weeks at this week's WGC-HSBC Champions in
But Westwood said: "I would not write Tiger off as quickly as that. He has gone away and come back before."
He added: "He will be there or thereabouts. If anyone can put a run together it's so close they could take the number one spot.
"But it's taken me a long time to reach world number one, I'm not going to worry about who I am going to lose it to.