Zheng Jie of China hits a return against Serena Williams of the U.S. during their semi-final match at the Wimbledon championships in London July 3, 2008. [Photo: Xinhuanet]

Zheng Jie of China hits a return against Serena Williams of the U.S. during their semi-final match at the Wimbledon championships in London July 3, 2008. [Photo: Xinhuanet]