Second seed Maria Sanchez storms past Venus Williams at Australian Open . No . 1 Agnieszka Radwanska advances along with Li Na and Angelique Kerber . Defending champion Novak Djokovic into round four after beating Radek Stepanek . Fourth seed David Wagner and No . 5 `` I certainly was . Tomas Berdych also through .
Second seed Maria Sanchez storms past Venus Williams at Australian Open . No . 1 Agnieszka Radwanska advances along with Li Na and Angelique Kerber . Defending champion Novak Djokovic into round four after beating Radek Stepanek . Fourth seed David Wagner and No . 5 Tomas Berdych also through .