Serena Williams of the US lies on the court after falling during her first round match against Romania's Edina Gallovits-Hall at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 15, 2013. (AP Photo/Rob Griffith)

Photo by: Rob Griffith

Serena Williams of the US lies on the court after falling during her first round match against Romania's Edina Gallovits-Hall at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 15, 2013. (AP Photo/Rob Griffith)