METZ, France (AP)—France’s Jo-Wilfried Tsonga and Richard Gasquet won in straight sets to reach the quarterfinals of the Moselle Open on Thursday, while Philipp Kohlschreiber of Germany lost to a qualifier.

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The top-seeded Tsonga beat French qualifier Mathieu Rodrigues 6-3, 6-4 to line up a match with Nicolas Mahut, who outlasted 2003 champion Arnaud Clement 3-6, 7-5, 6-3 in an all-French encounter.

The second-seeded Gasquet cruised past Olivier Rochus of Belgium 6-2, 6-1 and will next play Gilles Muller of Luxembourg.

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But there was an upset for seventh-seeded Kohlschreiber, who lost to Dutch qualifier Igor Sijsling 6-4, 7-5.

Sijsling hit 10 aces on his way to victory and broke Kohlschreiber once in each set. He will now meet fourth-seeded Ivan Ljubicic of Croatia.

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Sixth-seeded Xavier Malisse of Belgium also advanced to the last eight by defeating Igor Kunitsyn of Russia 6-4, 6-2. He now takes on third-seeded Alexandr Dolgopolov of Ukraine.