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Roger Federer, of Switzerland, wipes sweat from his face between points against Marin Cilic, of Croatia, during the semifinals of the 2014 U.S. Open tennis tournament, Saturday, Sept. 6, 2014, in New York. (AP Photo/Charles Krupa)

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Kei Nishikori, of Japan, reacts after defeating Novak Djokovic, of Serbia, during the semifinals of the 2014 U.S. Open tennis tournament, Saturday, Sept. 6, 2014, in New York. (AP Photo/Darron Cummings)

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Serena Williams, returns a shot against Ekaterina Makarova, of Russia, during the semifinals of the 2014 U.S. Open tennis tournament, Friday, Sept. 5, 2014, in New York. (AP Photo/Charles Krupa)

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Martina Hingis, right, hugs Flavia Pennetta after the two defeated Cara Black and Sania Mirza in a semifinal doubles match of the 2014 U.S. Open tennis tournament, Thursday, Sept. 4, 2014, in New York. (AP Photo/Charles Krupa)

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Marin Cilic, of Croatia, reacts after defeating Tomas Berdych, of the Czech Republic, during the quarterfinals of the 2014 U.S. Open tennis tournament, Thursday, Sept. 4, 2014, in New York. (AP Photo/Julio Cortez)

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Novak Djokovic, of Serbia, reacts after defeating Andy Murray, of Britain, 7-6 (1), 6-7 (1), 6-2, 6-4 during the quarterfinals of the U.S. Open tennis tournament, early Thursday, Sept. 4, 2014, in New York. (AP Photo/John Minchillo)

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A body camera that would be worn by police is displayed during a news conference in New York. Civil liberties advocates say the cameras — already in use in some smaller departments in the D.C. area — will facilitate oversight of interactions between officers and residents. Critics say they are cost-prohibitive for large departments. (Associated Press)

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Kei Nishikori, of Japan, reacts after defeating Stan Wawrinka, of Switzerland, in five sets during the quarterfinals of the 2014 U.S. Open tennis tournament, Wednesday, Sept. 3, 2014, in New York. (AP Photo/Mike Groll)

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Ekaterina Makarova, of Russia, reacts after defeating Victoria Azarenka, of Belarus, in two sets during the quarterfinals of the 2014 U.S. Open tennis tournament, Wednesday, Sept. 3, 2014, in New York. (AP Photo/Mike Groll)

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FILE - In a March 17, 2006 file photo, members of the Irish-American gay community protest on Fifth Avenue against the exclusion of Irish and Irish-American gays people from marching in the annual St. Patrick's Day Parade Friday, in New York. Organizers of the world's largest St. Patrick's Day Parade say they're ending a ban and allowing a gay group to march under its own banner for the first time. The parade committee, in a statement made available to The Associated Press, said on Wednesday, Sept. 3, 2014, that OUT@NBCUniversal, a lesbian, gay, bisexual and transgender support group at the company that broadcasts the parade, would be marching up Manhattan's Fifth Avenue on March 17 under an identifying banner. (AP Photo/Dima Gavrysh, File)

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Gael Monfils, of France, reacts after a shot against Grigor Dimitrov, of Bulgaria, during the fourth round of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Mike Groll)

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Peng Shuai, of China, reacts after defeating Belinda Bencic, of Switzerland, during the quarterfinals of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Mike Groll)

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Serena Williams, of the United States, returns a shot to Kaia Kanepi, of Estonia, during the fourth round of the 2014 U.S. Open tennis tournament, Monday, Sept. 1, 2014, in New York. (AP Photo/Charles Krupa)

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Caroline Wozniacki, of Denmark, reacts after defeating Maria Sharapova, of Russia, during the fourth round of the 2014 U.S. Open tennis tournament, Sunday, Aug. 31, 2014, in New York. (AP Photo/Kathy Willens)

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David Ferrer, of Spain, walks to his chair during a break between games against Gilles Simon, of France, during the third round of the 2014 U.S. Open tennis tournament, Sunday, Aug. 31, 2014, in New York. (AP Photo/Seth Wenig)

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John Isner, of the United States, reacts after a shot Philipp Kohlschreiber, of Germany, during the third round of the 2014 U.S. Open tennis tournament, Saturday, Aug. 30, 2014, in New York. (AP Photo/Darron Cummings)

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Sara Errani, of Italy, follows through on a shot against Venus Williams, of the United States, during the third round of the 2014 U.S. Open tennis tournament, Friday, Aug. 29, 2014, in New York. (AP Photo/Matt Rourke)

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Shuai Peng, of China, returns a shot against Roberta Vinci, of Italy, during the third round of the 2014 U.S. Open tennis tournament, Friday, Aug. 29, 2014, in New York. (AP Photo/Frank Franklin II)

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Ana Ivanovic, of Serbia, returns a shot against Kirolina Pliskova, of the Czech Republic, during the second round of the 2014 U.S. Open tennis tournament, Thursday, Aug. 28, 2014, in New York. (AP Photo/Frank Franklin II)

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Nathan Sheard of New York, N.Y. with Code Pink, holds a sign with the name of a man killed by police as he and other activists rally outside the Justice Department to call on the Attorney General to "help secure justice for Michael Brown and the people of Ferguson, Missouri, as well as an overhaul of US law enforcement tactics in order to stop police brutality and the militarization of police forces", Washington, D.C., Wednesday, August 27, 2014. (Andrew Harnik/The Washington Times)