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Haas, Dolgopolov reach Citi quarterfinals

Aug. 1, 2012 at 11:52 PM

WASHINGTON, Aug. 1 (UPI) -- Fourth-seeded Tommy Haas advanced at the Citi Open Wednesday with a 6-4, 7-5 win over Leonard Mayer of Argentina.

Haas, who has steadily climbed up the world rankings this year to No. 36, broke Mayer three times in the hard-court match and won 83 percent of his first-serve points.

Haas advanced to the quarterfinals, where he will face fellow German Tobias Kamke.

Kamke moved on by ousting Australian 6-4, 6-3.

Alexander Dolgopolov of Ukraine, the second seed in the tournament, cruised past Ruben Ramirez of Spain 6-1, 6-3 and will face U.S. veteran James Blake in the quarters.

Blake, who won the Citi in 2002 and was runner-up in 2005, knocked off Swiss qualifier Marco Chiudinelli 6-2, 6-4 Wednesday.

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