Mikhail Youzhny, the No. 12 seed, advanced to the quarterfinals by beating Tommy Robredo 7-5, 6-2, 4-6, 6-4 at Louis Armstrong Stadium.

Youzhny, who knocked out John Isner in the third round, will play the winner of the Sam Querrey-Stanislas Wawrinka match in the quarterfinals.

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