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Agnieszka Radwanska
Djokovic, Wawrinka advance to quarterfinals; Williams sisters still in it

MELBOURNE, Australia Reigning grand slam champions Novak Djokovic and Swiss Stan Wawrinka advanced to the quarterfinals of the Australian Open. Djokovic defeated first-time opponent Gilles Mueller 6-4, 7-5, 7-5 in an Australia Day encounter. He will next face eighth seed Milos Raonic, a winner with 30 aces in a match that lasted more than three hours against Feliciano Lopez 6-4, 4-6, 6-3, 6-7 (7-9), 6-3. Djokovic will be playing his 23rd straight quarterfinal at a major. Djokovic managed nearly 50 winners and committed 16 unforced errors but admitted to being somewhat uncomfortable at times with his movement. "It's never easy playing someone who take away your time, there was...