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Top-seeded Tipsarevic upset in Duesseldorf

Wednesday - 5/22/2013, 2:34pm  ET

Argentine's Guido Pella returns a shot to Serbia's Janko Tipsarevic during their tennis match at the Power Horse Cup in Duesseldorf, Germany, Wednesday, May 22, 2013. Pella, a qualifier, defeated top seeded Tipsarevic with 7-6 and 6-1. (AP Photo/dpa, Caroline Seidel)

DUESSELDORF, Germany (AP) -- 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. The German will next play Jarkko Nieminen, who defeated Roberto Bautista Agut 6-4, 5-7, 6-3.

Igor Sijsling knocked out fourth-seeded Philipp Kohlschreiber 3-6, 6-3, 6-4 and will play Jan Hajek. The Czech routed Daniel Brands 6-1, 6-0.


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