Janko Tipsarevic into Swiss semis
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The top-seeded Tipsarevic is looking for his second straight clay-court title after winning last week at Stuttgart, Germany.
The 30-year-old Mathieu, ranked No. 172 after recovering from a serious knee injury, will play his first semifinal on tour since September 2009. That was an indoor hard-court event in Metz, France.
Copyright 2012 by The Associated Press
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