Serbia

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Serena Williams of the U.S. clenches a fist in a match against Jelena Jankovic of Serbia during the quarterfinals of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Thursday, Feb. 20, 2014. (AP Photo/Kamran Jebreili)

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Serena Williams of the U.S. returns the ball to Jelena Jankovic of Serbia during the quarterfinals of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Thursday, Feb. 20, 2014. (AP Photo/Kamran Jebreili)

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Juventus forward Carlos Tevez, of Argentina, right, challenges for the ball with Chievo Verona Ivan Radovanovic of Serbia during a Serie A soccer match between Juventus and Chievo Verona at the Juventus stadium, in Turin, Italy, Sunday, Feb.16, 2014. (AP Photo/Massimo Pinca)

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Venus Williams of the U.S. returns the ball to Ana Ivanovic of Serbia during the third day of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Wednesday, Feb. 19, 2014. (AP Photo/Kamran Jebreili)

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CORRECTS NAME OF PLAYER - Benfica's Lazar Markovic, from Serbia, drives the ball past Pacos Ferreira's Helder Lopes, left, to score his team second goal in a Portuguese League soccer match at Mata Real stadium in Pacos de Ferreira, northern Portugal, Sunday, Feb. 16, 2014. (AP Photo/Paulo Duarte)

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CORRECTS GOAL SCORERS - Benfica's Ljubomir Fejsa, from Serbia, and Ezequiel Garay, from Argentina, celebrate their 2-0 victory over Pacos Ferreira in a Portuguese League soccer match at Mata Real stadium in Pacos de Ferreira, northern Portugal, Sunday, Feb. 16, 2014. Markovic and Garay scored the two goals.(AP Photo / Paulo Duarte)

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Benfica's Lazar Markovic, from Serbia, celebrates with Luisao, left, from Brazil, Rodrigo Lima from Brazil, and Rodrigo Machado, right, from Spain, after scoring his side's second goal against Pacos Ferreira in a Portuguese League soccer match at Mata Real stadium in Pacos de Ferreira, northern Portugal, Sunday, Feb. 16, 2014. Lazar Markovic scored once in Benfica's 2-0 victory.(AP Photo/Paulo Duarte)

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Jelena Jankovic of Serbia reacts after losing a point against Angelique Kerber of Germany during the semifinal of the WTA Qatar Ladies Open in Doha, Qatar, Saturday, Feb. 15, 2014. (AP Photo/Osama Faisal)

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Angelique Kerber of Germany celebrates after winning a point against Jelena Jankovic of Serbia during the semifinal of the WTA Qatar Ladies Open in Doha, Qatar, Saturday, Feb. 15, 2014. (AP Photo/Osama Faisal)

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Dortmund's Milos Jojic of Serbia, center celebrates with teammates after scoring during the German first division Bundesliga soccer match between BvB Borussia Dortmund and Eintracht Frankfurt in Dortmund, Germany, Saturday, Feb. 15, 2014. (AP Photo/Frank Augstein)