Serena Williams of The United States plays a forehand during The Ladies Singles Final against Angelique Kerber of Germany on day twelve of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 9, 2016 in London, England. Clive Brunskill/Getty Images hide caption

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Clive Brunskill/Getty Images

Eugenie Bouchard of Canada returns to Magdalena Rybarikova of Slovakia. Bouchard says she likes the loose fit of the controversial NikeCourt Premier Slam dress. Alastair Grant/AP hide caption

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Alastair Grant/AP

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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Peter Macdiarmid/Getty Images

Pigeons Fly In Fear As Rufus The Hawk Guards Wimbledon's Grass

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France's Marion Bartoli celebrates her Wimbledon women's singles championship. The BBC has apologized to Bartoli for remarks an announcer made about her appearance. Dominic Lipinski /PA Photos/Landov hide caption

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Dominic Lipinski /PA Photos/Landov

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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Dominic Lipinski /PA Photos/Landov

Serbia's Novak Djokovic (left) embraces Argentina's Juan Martin Del Potro after their match on day 11 of the 2013 Championships at Wimbledon. Carl Court/AFP/Getty Images hide caption

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Carl Court/AFP/Getty Images

Defending champion Serena Williams lost to Sabine Lisicki of Germany 6-2 1-6 6-4 in the fourth round of the Wimbledon Championships. Andy Rain/EPA /Landov hide caption

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Andy Rain/EPA /Landov

Seven-time Wimbledon champion Roger Federer leaves the court Wednesday, after losing in the second round to Ukraine's Sergiy Stakhovsky. Adrian Dennis/AFP/Getty Images hide caption

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Adrian Dennis/AFP/Getty Images