Janko Tipsarevic moves to semifinals
VIENNA -- Top-seeded Juan Martin del Potro and Janko Tipsarevic won in straight sets on Friday to reach the semifinals of the Erste Bank Open.
Del Potro defeated Marinko Matosevic of Australia 6-2, 6-2 to line up a match against Gilles Muller of Luxembourg. Second-seeded Tipsarevic was leading 6-2, 4-2 when Aljaz Bedene retired with a left thigh injury.
It was del Potro's second match since returning from a right wrist injury that sidelined him for more than a month.
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