She will next play 31st seed Lucie Safarova , who beat Klara Zakopalova of the Czech Republic 6-3 6-7 (2-7) 7-5.

BBC: Australian Open: Seventh seed Jelena Jankovic falls

Sharapova will next face 21st-seeded Czech Klara Zakopalova, who upset another Russian when she beat No. 14 Maria Kirilenko 6-2 7-6 (7-4).

CNN: Djokovic, Sharapova battle into last 16 in windy Miami

Russian qualifier Valeria Savinykh upset No. 15 Dominika Cibulkova 7-6 (6), 6-4 and Kirsten Flipkens of Belgium beat No. 23 Klara Zakopalova 6-1, 6-0.

NPR: Djokovic, Sharapova Cruise At Aussie Open