Denmark's Caroline Wozniacki lies on the ground from a cramp in her leg during her WTA Championships tennis match against Vera Zvonareva of Russia in Doha on October 29, 2009. The Danish teenager overcame crippling cramp to reach the WTA Championships semi-finals defeating Russia's late call-up Vera Zvonareva 6-0, 6-7 (3/7), 6-4. Getty Images logo Getty Images 3 months ago

Denmark's Caroline Wozniacki lies on the ground from a cramp in her leg during her WTA Championships tennis match against Vera Zvonareva of Russia in Doha on October 29, 2009. The Danish teenager overcame crippling cramp to reach the WTA Championships semi-finals defeating Russia's late call-up Vera Zvonareva 6-0, 6-7 (3/7), 6-4.