Serena Williams of the United States  follows through on a shot as she plays Ashleigh Barty of Australia at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Serena Williams of the United States follows through on a shot as she plays Ashleigh Barty of Australia at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

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