World No 1 and top seed Serena Williams was knocked out of the Australian Open by Serbian Ana Ivanovic on Sunday.
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World No 14 Ivanovic, a former world number one, ended the American's 25-match winning streak to reach her first Grand Slam quarter-final since the 2012 U.S. Open.
Image: Serena Williams of the United States reacts in her fourth round match against Ana Ivanovic of Serbia on Sunday
Photograph: Chris Hyde/Getty Images
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