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| | Roger Federer, of Switzerland, serves to Novak Djokovic, of Serbia, during their semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 6, 2008. (AP Photo/Elise Amendola) |
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| | Novak Djokovic, of Serbia, reaches out to return a shot to Roger Federer, of Switzerland, during their semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 6, 2008. (AP Photo/Charles Krupa) |
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| | Novak Djokovic, of Serbia, serves to Roger Federer, of Switzerland, during their semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 6, 2008. (AP Photo/Charles Krupa) |
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| | Roger Federer, of Switzerland, reaches out to return a shot to Novak Djokovic, of Serbia, during their semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 6, 2008. (AP Photo/Charles Krupa) |
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| | Novak Djokovic, of Serbia, returns a shot to Roger Federer, of Switzerland, during their semifinal match at the U.S. Open tennis tournament in New York, Saturday, Sept. 6, 2008. (AP Photo/Julie Jacobson) |
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| | Serena Williams, of the United States, reacts after defeating Dinara Safina, of Russia, in two sets in their semifinal match at the U.S. Open tennis tournament in New York, Friday, Sept. 5, 2008. (AP Photo/Julie Jacobson) |
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