Three top women tennis players have all been ousted in the fourth round at the Wimbledon championship in London, including two-time defending champion Serena Williams of the United States.

After nearly one year on the sidelines with serious injury and health problems, the seventh-seeded Williams fell to ninth seed Marion Bartoli of France, 6-3, 7-6. Bartoli had never before beaten Williams and Monday's win halted Serena's 17-match winning streak at Wimbledon.

Serena's older sister Venus Williams was also upset, losing 6-2, 6-3 to Bulgarian Tsvetana Pironkova. Venus won Wimbledon in 2007 and 2008, so for the first time since 2006, the tournament will have a new champion other than one of the Williams sisters.

It won't be world number-one Caroline Wozniacki of Denmark. Still aiming for her first Grand Slam title, Wozniacki fell Monday to 24th-seeded Dominika Cibukova of Slovakia, 1-6, 7-6, 7-5.

With 2004 champion Maria Sharapova of Russia among those advancing, it marks the first time since 1913 that all eight women's Wimbledon quarterfinalists are from Europe – and all from different countries.

The fifth-seeded Sharapova ousted 20th seed Peng Shuai of China, 6-4, 6-2.