Tennis

Tipsarevic upset in Duesseldorf

Published May. 22, 2013 1:00 a.m. ET

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Top-seeded Janko Tipsarevic lost in the second round of the Power Horse Cup on Wednesday, falling 7-6 (1), 6-1 to Argentine qualifier Guido Pella.

It's the biggest career win for the 101st-ranked Pella, knocking out the 10th-ranked Serb to reach the ATP World Tour quarterfinals for the first time.

Pella will play seventh-seeded Viktor Troicki of Serbia, who defeated Grega Zemlja of Slovenia 6-3, 7-6 (3).

Third-seeded Juan Monaco of Argentina topped Andre Ghem 6-4, 6-4 of Brazil to set up a quarterfinal with Tobias Kamke, who beat Aljaz Bedene 6-1, 6-4.

Second-seeded Tommy Haas of Germany rallied past Ivan Dodig 3-6, 6-4, 7-5.

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