Serena Williams of the U.S. reacts in frustration during her fourth-round match against Russia's Ekaterina Makarova at the Australian Open in Melbourne, Australia, on Monday, Jan. 23, 2012. (AP Photo/Andrew Brownbill)
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Serena Williams of the U.S. reacts in frustration during her fourth-round match against Russia's Ekaterina Makarova at the Australian Open in Melbourne, Australia, on Monday, Jan. 23, 2012. (AP Photo/Andrew Brownbill)
