Serena Williams of the U.S. celebrates defeating Zheng Jie of China during their semi-finals match at the Wimbledon tennis championships in London July 3, 2008. [Agencies]

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