Defending champion Novak ##ović survives five - set epic to defeat Stanislas Wawrinka . Serbian world No . 1 wins 7 - 6 7 - 5 6 - 4 6 - 4 12 - 10 to maintain Australian Open defense . David Adams , Nicolas Almagro and Tomas Beck all through to quarterfinals . Maria Sharapova , Agnieszka Radwanska and Li Na through to last 16 in women 's draw .
Defending champion Novak Djokovic survives five-set epic to defeat Stanislas Wawrinka . Serbian world No . 1 wins 1-6 7-5 6-4 6-7 12-10 to maintain Australian Open defense . David Ferrer , Nicolas Almagro and Tomas Berdych all through to quarterfinals . Maria Sharapova , Agnieszka Radwanska and Li Na through to last eight in women 's draw .