Imogen Davis catches Rufus, a Harris hawk, in the stands above Centre Court at Wimbledon. Rufus scares off pigeons who try to eat the ryegrass on the tennis courts. Peter Macdiarmid/Getty Images hide caption

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Stanislas Wawrinka of Switzerland kisses the Australian Open trophy during the awarding ceremony after winning the men's singles final against Spain's Rafael Nadal on Sunday in Melbourne, Australia. Xu Yanyan/Xinhua/Landov hide caption

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Li Na of China celebrates after defeating Dominika Cibulkova of Slovakia during their women's singles final at the Australian Open tennis championship in Melbourne, Australia, on Saturday. Rick Rycroft/AP hide caption

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Rafael Nadal of Spain celebrates after defeating Roger Federer of Switzerland during their semifinal Friday at the Australian Open tennis championship in Melbourne. Aaron Favila/AP hide caption

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Novak Djokovic of Serbia wipes the sweat from his face during his quarterfinal loss to Stanislas Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne. Aaron Favila/AP hide caption

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Serena Williams holds up the championship trophy after defeating Victoria Azarenka, of Belarus, during the women's singles final of the 2013 U.S. Open tennis tournament on Sunday in New York. David Goldman /AP hide caption

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Venus Williams waves to tennis fans as she leaves the court after a three-hour loss to Zheng Jie of China in the U.S. Open's second round. Don Emmert/AFP/Getty Images hide caption

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Venus Williams hits a forehand during her first-round win over Kirsten Flipkens of Belgium Monday. Matthew Stockman/Getty Images hide caption

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France's Marion Bartoli celebrates her women's singles championship at The All England Lawn Tennis and Croquet Club in Wimbledon. Dominic Lipinski /PA Photos/Landov hide caption

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