Troicki, Zvonareva advance at Kremlin Cup

Defending mens champion Viktor Troicki and top-seeded woman Vera Zvonareva advanced to the quarterfinals of the Kremlin Cup with straight-set victories on Wednesday, while Lucie Safarova upset second-seeded Agnieszka Radwanska 6-4, 4-6, 6-4.The second-seeded Troicki beat Pere Riba of Spain 6-4, 6-4, while Zvonareva routed Bojana Jovanovski of Serbia, 6-1, 6-1.With a victory, Radwanska could have secured the last spot left for next weeks season-ending WTA Tour championships in Istanbul. Now she will have to wait for Marion Bartolis results in Moscow this week.Fresh from winning her seventh career title in Osaka, Japan, Bartoli is seeded third and needs to win the title here. Any other result for her will see Radwanska qualify directly for the first time after being a substitute in 2008 and 09.Also Wednesday, Kaia Kanepi of Estonia came from 5-1 down in a third-set tiebreaker to upset fourth-seeded Francesca Schiavone of Italy 6-4, 5-7, 7-6 (7), and three-time winner Nikolay Davydenko, seeded fourth, defeated fellow Russian Teimuraz Gabashvili 7-5, 6-2.Troicki broke once in each set and sealed the victory on his first match point. The Serbian player will face Alex Bogomolov Jr. of the United States, who beat his doubles partner Mikhail Kukushkin of Kazakhstan 6-4, 3-6, 6-4 to advance.In the last two womens first-round matches, eighth-seeded Dominika Cibulkova of Slovakia defeated Polona Hercog of Slovenia 6-3, 7-6 (3), while Elena Vesnina routed wild card Alla Kudryavtseva 6-0, 6-1.