Sam Querrey

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Serbia's player Novak Djokovic reacts during his match against Sam Querrey of the U.S. at the Paris Tennis Masters tournament, Wednesday, Oct. 31, 2012. Sam Querrey defeated Novak Djokovic. (AP Photo/Remy de la Mauviniere)

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Sam Querrey n the third round of play at the 2012 US Open tennis tournament, Saturday, Sept. 1, 2012, in New York. (AP Photo/Henny Ray Abrams)

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Sam Querrey reacts after defeating Kevin Anderson, of South Africa, during the Citi Open tennis tournament on Friday, Aug. 3, 2012, in Washington. (AP Photo/Evan Vucci)

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Sam Querrey plays in his match against Benjamin Becker at the Citi Open tennis tournament at the William H.G. FitzGerald Tennis Center, Washington D.C., Thursday, August 2, 2012. (Ryan M.L. Young/The Washington Times)

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Sam Querrey plays in his match against Benjamin Becker at the Citi Open tennis tournament at the William H.G. FitzGerald Tennis Center, Washington D.C., Thursday, August 2, 2012. (Ryan M.L. Young/The Washington Times)

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Benjamin Becker plays in his match against Sam Querrey at the Citi Open tennis tournament at the William H.G. FitzGerald Tennis Center, Washington D.C., Thursday, August 2, 2012. (Ryan M.L. Young/The Washington Times)

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Benjamin Becker plays in his match against Sam Querrey at the Citi Open tennis tournament at the William H.G. FitzGerald Tennis Center, Washington D.C., Thursday, August 2, 2012. (Ryan M.L. Young/The Washington Times)