Novak Djokovic survived an almighty scare from an inspired Stan Wawrinka in a five-hour, five-set thriller at the Australian Open on Sunday, reaching a 15th consecutive grand slam quarter-final.
Berdych overcame Kevin Anderson 6-3 6-2 7-6.
Agnieszka Radwanska continued her perfect start to the year with her 13th successive victory to set up a quarter-final with Li Na.
—Photos by Agencies
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