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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.

Top-ranked Serena Williams won her opening match on the red clay of the Madrid Open on Sunday.

Defending champion Maria Sharapova will face Li Na in the final of the Porsche Grand Prix on Sunday in a matchup of the last two French Open winners.

Top-seeded Maria Sharapova got through another tough test in outlasting Ana Ivanovic 7-5, 4-6, 6-4 on Friday to advance to the semifinals of the Porsche Grand Prix.

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

Top-ranked Novak Djokovic has advanced to the semifinals of the BNP Paribas Open with a 6-3, 6-1 victory over Jo-Wilfried Tsonga in 54 minutes.

Rafael Nadal defeated error-prone Roger Federer 6-4, 6-2 in the quarterfinals of the BNP Paribas Open on Thursday night in the earliest meeting between the two rivals since they first played each other in 2004.

Defending champion Victoria Azarenka has withdrawn from the BNP Paribas Open because of a right ankle injury that had been bothering the world's second-ranked player since before the tournament began.

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.

Defending champion Agnieszka Radwanska led several of the top seeds into the Dubai Championships quarterfinals on a Wednesday overshadowed by the withdrawal of Serena Williams because of a back injury.

Second-ranked Victoria Azarenka withdrew from the Dubai Championships on Tuesday because of a bone bruise in her right foot.

Serena Williams and Maria Sharapova eased into the third round of the Qatar Open on Tuesday, dominating their opponents with straight-set victories.

Maria Sharapova beat Kirsten Flipkens 6-1, 6-0 on Sunday to continue a dominant and unparalleled run to the Australian Open quarterfinals.

Fifth-seeded Angelique Kerber celebrated her 25th birthday Friday with a 6-2, 7-5 win over American teenager Madison Keys in a third-round match at the Australian Open.

The No. 2-ranked Maria Sharapova overwhelmed Japan's Misaki Doi in 47 minutes Wednesday, even less time than she'd needed to beat fellow Russian Olga Puchkova two days earlier in her first competitive match of 2013.