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Day of upsets: Two-time defending champ Serena, Venus, No. 1 Wozniacki ousted

Toby Melville / Reuters

Serena Williams of the U.S. reacts during her match against Marion Bartoli of France at the Wimbledon tennis championships in London on Monday, June 27.

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Dominika Cibulkova of Slovakia celebrates match point after winning her fourth round match against Caroline Wozniacki of Denmark on Day Seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on Monday.

Suzanne Plunkett / Reuters

Andy Murray of Britain celebrates defeating Richard Gasquet of France at the Wimbledon tennis championships in London on Monday.

Clive Brunskill / Getty Images

Serena Williams of the US prepares to serve during her fourth round match against Marion Bartoli of France on Day Seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on Monday.

Alastair Grant / AP

Russia's Maria Sharapova serves to China's Peng Shuai during their match at the All England Lawn Tennis Championships at Wimbledon on Monday.

Kirsty Wigglesworth / AP

Britain's Duke and Duchess of Cambridge arrive at center court prior to the start of play at the All England Lawn Tennis Championships at Wimbledon on Monday.

Suzanne Plunkett / Reuters

Venus Williams of the US reacts during her match against Tsvetana Pironkova of Bulgaria at the Wimbledon tennis championships in London on Monday.

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