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Tennis-Ivanovic dumps Serena from Australian Open fourth round

MELBOURNE, Jan 19 (Reuters) - Ana Ivanovic dumped world number one Serena Williams out of the Australian Open on Sunday with a stunning 4-6 6-3 6-3 fourth-round upset. Serbian 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. (Reporting by Ian Ransom; Editing by Peter Rutherford)