Defending champion Novak Djokovic survives five-set epic to defeat Stanislas Wawrinka . But Wawrinka battled hard and ensured a deciding set when he took his third set point as the fourth went into a tiebreak . Serbian world number one will play in the last eight for first time since 2013 Wimbledon final. 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 .
Defending champion Novak Djokovic survives five-set epic to defeat Stanislas Wawrinka . Serbian world number one will play in the last eight for first time since 2013 Wimbledon final. 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 .