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Tennis-Radwanska knocks out defending Melbourne champion Azarenka

MELBOURNE, Jan 22 (Reuters) - Victoria Azarenka, champion for the last two years at Melbourne Park, was knocked out of the Australian Open quarter-finals by fifth seed Agnieszka Radwanska on Wednesday. Pole Radwanska beat the second seeded Belarusian 6-1 5-7 6-0 to set up a last four meeting with Dominika Cibulkova of Slovakia. (Reporting by Nick Mulvenney, editing by Peter Rutherford)