Serena Williams reacts to a point against Zheng Jie during a third-round women's singles match at the All England Lawn Tennis Championships at Wimbledon, England, on Saturday, June 30, 2012. (AP Photo/Anja Niedringhaus)

Photo by: Anja Niedringhaus

Serena Williams reacts to a point against Zheng Jie during a third-round women's singles match at the All England Lawn Tennis Championships at Wimbledon, England, on Saturday, June 30, 2012. (AP Photo/Anja Niedringhaus)