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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)

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)

2013 Australian Open

Highlights from the 2013 Australian Open tennis championship in Melbourne, Australia.