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Ana Ivanovic defeated Andrea Petkovic 6-3, 6-2 Tuesday in the first round of the Porsche Tennis Grand Prix.

Maria Sharapova has advanced to the fourth round at the Sony Open by beating fellow Russian Elena Vesnina 6-4, 6-2.

Roger Federer beat Denis Istomin of Russia 6-2, 6-3 in their second-round match at the BNP Paribas Open championships on Saturday.

Former Wimbledon champion Petra Kvitova overpowered defending champion Agnieszka Radwanska 6-2, 6-4 Thursday to set up a semifinal against Caroline Wozniacki in the Dubai Championships.

Wild card entrants Jarmila Gajdosova and Matthew Ebden combined to win the Australian Open mixed doubles title with a 6-3, 7-5 win over Lucie Hradecka and Frantisek Cermak on Sunday.

Former champion Li Na advanced to the second round of the Sydney International with a 7-6 (2), 7-5 win over Christina McHale on Monday, and Sam Stosur extended her miserable start to 2013 with another first-round loss.

Nadia Petrova stunned top-seeded Caroline Wozniacki 6-2, 6-1 to win the Tournament of Champions on Sunday, clinching her third WTA title of the year.

Top-seeded Caroline Wozniacki reached the Tournament of Champions final after beating Bulgaria's Tsvetana Pironkova 6-4, 6-1 on Saturday.

Sofia Arvidsson of Sweden secured victory without finishing the first set when Zheng Jie of China retired at 5-1 in the season-ending Tournament of Champions on Friday.

Already qualified for the semifinals, top-seeded Caroline Wozniacki beat Slovakia's Daniela Hantuchova 3-6, 7-6 (4), 6-4 on Thursday to make it three wins from three at the season-ending Tournament of Champions.

Caroline Wozniacki defeated Roberta Vinci of Italy 6-3, 6-1 Wednesday to advance to the semifinals of the Tournament of Champions.

Novak Djokovic won his opening match at the China Open by defeating German qualifier Michael Berrer 6-1, 6-7 (3), 6-2 on Tuesday in his first match since losing the U.S. Open final.

With the higher-ranked names out of the picture, the lesser-ranked players are making their own brand of noise on the ATP and WTA tours, Peter Bodo writes.

Russia's Nadia Petrova beat defending champion Agnieszka Radwanska 6-0, 1-6, 6-3 on Saturday to win the Pan Pacific Open.

Defending champion Agnieszka Radwanska will play Nadia Petrova in the final of the Pan Pacific Open.

Sam Stosur knocked two-time champion Maria Sharapova out of the Pan Pacific Open on Thursday, reaching the semifinals with a 6-4, 7-6 (10) victory over the Russian.