Westwood tees off with new caddie

Lee Westwood has a new caddie in Charlotte this week - and may not have Billy Foster back until after The Open in July.

Yorkshireman Foster injured his right knee just before a charity football match on Monday and, according to the world number three, could be out of action for more than two months.

Westwood, who will have American Casey Kerr alongside him in the Wells Fargo Championship at Quail Hollow, said on his website: "Billy could not only miss this event, next week's Players Championship and the PGA at Wentworth, but also the US Open and The Open."

He added: "Billy's an integral part of the team and is very important. I'm not sure how it will affect me."

In Charlotte, both Westwood and Rory McIlroy have the chance to dethrone the resting Luke Donald as world number one, and Tiger Woods, like McIlroy, plays his first event since The Masters.

Kerr usually works for Fred Couples, but the former Masters champion is currently suffering from 'flu.

Westwood will be back at the top of the rankings for the first time in almost a year if he wins on Sunday and McIlroy is outside the first six.

But if Westwood does not lift the title the Northern Irishman - 23 this Friday - needs a top-seven finish to go to number one for the third time in just over two months.

McIlroy and Woods have both had three weeks to digest what went wrong in The Masters, where so much was expected of them and they finished joint 40th.

Woods said: "I was struggling with my ball-striking - it had to do with my posture. My set-up wasn't quite right, as well as my takeaway."