WINSTON-SALEM, N.C. (AP) — John Isner's preparations for the U.S. Open hit a setback Thursday when a sprained ankle forced him to withdraw from the Winston-Salem Open hours before his quarterfinal.
Isner, seeded 13th for next week's tournament at Flushing Meadows, was to have played Lukas Rosol of the Czech Republic.
At No. 15, Isner is the highest-ranked American in the U.S. Open. He is to face Marcos Giron, the 2014 NCAA singles champion, in the first round.
"I can't risk further injury with the U.S. Open right around the corner," Isner said during a news conference at the Wake Forest Tennis Center. "It was pretty uncomfortable doing even minimal stretching on it. I didn't see the benefit of taking the court."
Isner's withdrawal sends Rosol to Friday's semifinals, where he will play ninth-seeded Yen-Hsun Lu of Taiwan, a 6-4, 6-4 winner over 14th-seeded Andreas Seppi of Italy.
The other semifinal will have American Sam Querrey take on Poland's Jerzy Janowicz. Querrey advanced by beating fifth-seeded Guillermo Garcia-Lopez of Spain 6-7 (3-7), 6-2, 6-4. Janowicz beat Belgian qualifier David Goffin 6-4, 6-2.
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