Serena Williams, centre, of the US celebrates with Serbia's Ana Ivanoic as Novak Djokovic looks on during an exhibition match on Rod Laver Arena during the Kids Tennis Day at Melbourne Park ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 12, 2013. (AP Photo/Aaron Favila)

Associated Press
Serena Williams, centre, of the US celebrates with Serbia's Ana Ivanoic as Novak Djokovic looks on during an exhibition match on Rod Laver Arena during the Kids Tennis Day at Melbourne Park ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 12, 2013. (AP Photo/Aaron Favila)
Serena Williams, centre, of the US celebrates with Serbia's Ana Ivanoic as Novak Djokovic looks on during an exhibition match on Rod Laver Arena during the Kids Tennis Day at Melbourne Park ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 12, 2013. (AP Photo/Aaron Favila)
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