Vienna - Philipp Kohlschreiber reached his fifth ATP quarterfinal of the season at the BA Trophy on Wednesday when Victor Crivoi of Romania quit their match with a shoulder injury while trailing 6-2, 3-0.

The fourth-seeded German conceded only five points on serve and broke Crivoi four times.

Kohlschreiber will next play either fifth-seeded Nicolas Almagro or Wayne Odesnik.

In the first round, Janko Tipsarevic defeated eighth-seeded John Inser of the United States 7-6 (4), 6-4. The Serb, who reached his first career final in Moscow last week, managed only four points on Isner's serve in the opening set before winning the tiebreaker.
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