- WTA Championships
Wozniacki guaranteed to finish year as world No. 1

Maria Sharapova has pulled out of the season-ending WTA Championships in Turkey due to an ankle injury.
Sharapova lost both of her first two matches at the tournament - to Sam Stosur and Li Na - in straight sets, with the second defeat ending her chances of displacing Caroline Wozniacki as the world No. 1.
And following her match with Li, it was announced that an ankle problem had ended her involvement. "The ankle didn't recover as well as I had hoped after my first match," she said. "It limits my movement a lot and it's not something I really want to risk. I tried to push it as much as I could but I think it was a little too soon."
Denmark's Wozniacki, who is yet to win a grand slam, is guaranteed to end the year as the world No. 1. She won her opener in Turkey against Agnieszka Radwanska, but lost Wednesday's match with Vera Zvonareva.
