WTA Championships - semi-finalists in focus

Question

The WTA Tour Championships semi-finalists have been decided, and in a strong final four Kim Clijsters still shapes as though she may be the player to beat. She's joined in the semis by Vera Zvonareva, Samantha Stosur and Caroline Wozniacki. Read the full article at http://blogs.bettor.com/WTA-Championships-Clijsters-on-track-for-title-a37429.