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Tennis: Ivanovic knocks Serena out of Australian Open


Former world number one Ana Ivanovic pulled off a massive upset by beating top seed Serena Williams on Sunday to power into the Australian Open quarter-finals.

The Serb came from a set down to win 4-6, 6-3, 6-3, ending Williams' bid to match Chris Evert and Martina Navratilova with 18 Grand Slam titles.