ranked Caroline Wozniacki rallied to defeat Agnieszka Radwanska of Poland 5-7, 6-2, 6-4 Tuesday in their opening round-robin match at the WTA Championships. Wozniacki wasted a 4-2 lead in the third set but broke again when Radwanska netted a forehand on the Dane's second match point. Radwanska converted both her break points to take the first set. The second set featured six breaks of serve, with Wozniacki getting four of them. In the early Red Group match, Wimbledon champion Petra Kvitova beat Vera Zvonareva of Russia 6-2, 6-4. Making her first appearance at the season-ending tournament for the top eight players of the season, Kvitova wasted a 4-1 lead to be level at 4-4 in the second set but broke again immediately before wrapping up the win. Cilic, Bogomolov advance Fourth-seeded Marin Cilic of Croatia and American Alex Bogomolov Jr., seeded seventh, advanced to the second round of the St. Petersburg Open with straight-sets victories Tuesday, while defending champion Mikhail Kukushkin of Kazakhstan made an early exit. Bogomolov beat Igor Kunitsyn of Russia 6-3, 6-1, while Cilic ousted Ukrainian qualifier Sergei Bubka 6-4, 7-6 (1). Later, eighth-seeded Dmitry Tursunov beat fellow Russian Teymuraz Gabashvili 7-5, 6-3. Kukushkin was beaten by Michael Berrer of Germany 6-1, 4-6, 6-4. Julien Benneteau of France also advanced with a straight-sets victory over Pere Riba of Spain, 6-2, 6-1. Serbian qualifier Dusan Lajovic advanced to the second round with a 6-4, 6-4 victory over Jeremy Chardy of France. Muster beaten In Vienna, former top-ranked Thomas Muster's brief comeback ended Tuesday after a 6-2, 6-3 loss to fellow Austrian Dominic Thiem in the first round of the Erste Bank Open. Earlier, Tommy Haas rallied to beat fifth-seeded Juan Ignacio Chela of Argentina 6-7 (3), 6-3, 7-6 (5) Tuesday in the first round of the Erste Bank Open. The 273rd-ranked German, who won the event in 2001, failed to serve out the match at 5-3 in the decider but converted his fourth match point in the tiebreaker. Haas will next play Aljaz Bedene of Slovenia, who won the opening set against Ivo Karlovic 7-6 (4) before the Croat pulled out with a back injury. Eighth-seeded Fabio Fognini of Italy advanced after Tommy Robredo of Spain retired with a left leg injury while trailing 7-6 (7), 5-7, 2-1. Also, 2008 champion Philipp Petzschner of Germany routed Spain's Pablo Andujar 6-2, 6-2, and Daniel Brands of Germany defeated Martin Fischer of Austria 6-7 (3), 6-2, 7-6 (6).
