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A week out from the French Open, Serena Williams is only one victory away from winning her fourth consecutive title this year.

Roger Federer was ousted by Kei Nishikori of Japan with a 6-4, 1-6, 6-2 loss Thursday in the third round of the Madrid Open.

Seventh-seeded Sara Errani advanced to the second round of the Madrid Open, beating Urszula Radwanska of Poland, 6-3, 6-1 on Saturday.

Rafael Nadal is not sure how his injured left knee will respond to his first hardcourt match of the year at the BNP Paribas Open.

Former Wimbledon champion Petra Kvitova got out of the first round of the Dubai Championships for the first time in three visits by easily handling Daniela Hantuchova 6-2, 6-1 on Tuesday.

American Varvara Lepchenko won in her Fed Cup singles debut to lift the United States to a 1-1 tie against Italy on Saturday.

Ayumi Morita of Japan knocked top-seed Ana Ivanovic out of the Pattaya Open on Thursday, beating the Serb 6-3, 5-7, 6-3.

Rain washed out play Wednesday at the Pattaya Open with defending champion Daniela Hantuchova of Slovakia yet to play her first round match.

Unseeded Marina Erakovic of New Zealand beat third-seeded Hsieh Su-wei of Taiwan 6-2, 6-2 Monday in the first round of the Pattaya Open.

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.

Serena Williams had a tough win over the woman she's predicting will one day top the rankings, setting up a semifinal match at the Brisbane International against current No. 1 Victoria Azarenka.

Serena Williams carried her relentless form into the New Year with a 6-2, 6-2 victory over Alize Cornet on Tuesday at the Brisbane International, where Maria Sharapova withdrew and two other highly ranked players went out in the second round.

Serena Williams joked that since the calendar still read 2012, she needed to maintain this year's dominant form.

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 and Roberta Vinci had easy straight-set victories Tuesday in their first round-robin matches at the season-ending Tournament of Champions.