BEIJING – Top-seeded Novak Djokovic advanced to the quarterfinals of the China Open after American Mardy Fish withdrew with a left ankle injury.
Top-seeded Caroline Wozniacki defeated Sara Errani 6-4, 6-2, while Francesca Schiavone rallied for a 4-6, 6-3, 6-1 victory over Vera Dushevina. Wozbiacki will take over the No. 1 ranking from Serena Williams with her win.
Nikolay Davydenko edged Marin Cilic 7-5, 7-5. He'll face American John Isner, who beat Philipp Kohlschreiber 7-6 (3), 3-6, 6-3 in a match that featured a combined 33 aces.
Qualifier Michael Berrer fell to Gilles Simon 6-7 (6), 6-4, 7-6 (4).
Second-seeded Vera Zvonereva moved into the quarterfinals after defeating Maria Kirilenko 5-7, 6-4, 6-2.
Shahar Peer cruised past Bojana Jovanovski 6-1, 6-2, while Angelique Kerber defeated Alexandra Dulgheru 6-2, 6-1.