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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.

Venus Williams has withdrawn from the Madrid Open because of back problems.

Serena Williams can reclaim the No. 1 ranking at the Qatar Open, a spot the 15-time major champion has not held since October 2010.

Spain defeated Serbia 2-1 to win the Hopman Cup for the fourth time on Saturday.

John Isner withdrew from the Hopman Cup on Thursday because of a right knee injury, ending the American team's chances of reaching the final of the eight-country tournament and handing a championship berth to Spain.

Bernard Tomic upset top-ranked Novak Djokovic 6-4, 6-4 but Australia lost to Serbia 2-1 at the Hopman Cup on Wednesday.

Venus Williams and John Isner led the United States to a 2-1 victory over South Africa at the Hopman Cup mixed team competition Sunday.

Unseeded Pauline Parmentier of France reached the quarterfinals of the Japan Open by beating second-seeded Zheng Jie of China 6-3, 6-4 on Thursday.

Second-seeded Jie Zheng of China advanced to the second round of the Japan Open with a 4-6, 7-5, 6-4 win over Maria Jose Martina Sanchez of Spain on Tuesday.

Caroline Wozniacki of Denmark cruised into the quarterfinals of the Korea Open on Thursday by beating Caroline Garcia of France, 6-2, 6-3.

Caroline Wozniacki reached the second round of the Korea Open by beating Arantxa Rus of the Netherlands 6-1, 6-2 Tuesday.

Thirteenth-seeded Alexandr Dolgopolov became the first player upset at Cincinnati, falling to 50th-ranked Nikolay Davydenko 6-1, 6-1 in the first round Monday.

Top-seeded Sara Errani cruised past Edina Gallovits-Hall of Romania 6-1, 6-1 in the first round of the Italiacom Open on Tuesday, while five-time champion Anabel Medina Garrigues lost to a wild-card entry.

Reigning Olympic gold medalist Rafael Nadal will lead Spain's tennis team at the London Games.

Second-seeded Francesca Schiavone of Italy easily defeated Johanna Larsson of Sweden 6-0, 6-3 to reach the Strasbourg International semifinals Thursday, but three-time champion Anabel Medina Garrigues lost.

Three-time champion Anabel Medina Garrigues and second-seeded Francesca Schiavone reached the quarterfinals of the Strasbourg International on Wednesday.