Article Photos: Williams, Azarenka into 4th round at Aussie Open

Russia's Maria Sharapova celebrates after defeating Venus Williams of the US in their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)

Russia's Maria Sharapova celebrates after defeating Venus Williams of the US in their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 18, 2013. (AP Photo/Dita Alangkara)