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Summary Isner beat 13th-seeded Jurgen Melzer of Austria 6-4, 6-3.
Defending champion John Isner overcame two rain delays to advance in straight sets, while Andy Roddick was eliminated from the Winston-Salem Open on Wednesday.The third-seeded Isner, ranked 10th in the world, needed only 71 minutes to beat 13th-seeded Jurgen Melzer of Austria 6-4, 6-3 in the third round at the Wake Forest Tennis Complex.The fifth-seeded Roddick, a former world No. 1 now ranked 21st, fell to 81st-ranked Steve Darcis of Belgium 7-6 (8-6), 7-6 (7-3), in the final hard-court tournament before the U.S. Open next week in New York.Top-seeded Jo-Wilfried Tsonga of France also advanced to the quarterfinals along with second-seeded Tomas Berdych of the Czech Republic, fourth-seeded Alexandr Dolgopolov of the Ukraine, sixth-seeded Marcel Granollers of Spain, seventh-seeded Sam Querrey and Belgiums David Goffin.Tsonga defeated Sergiy Stakhowsky of the Ukraine 7-6 (7-1), 6-4; Berdych downed Finlands Jarkko Nieminen 6-3, 6-2; Dolgopolov beat No. 14 David Nalbandian of Argentina 6-3, 6-4; Granollers rallied to beat Latvias Ernests Gulbis 4-6, 6-3, 6-2; Querrey edged ninth-seeded Feliciano Lopez of Spain 6-3, 6-4; and Goffin downed Polands Lukasz Kubot 6-3, 1-6, 7-6 (7-5).
