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Karlovic downs defending champ Monaco in Duesseldorf Open

Photo: CAROLINE SEIDEL/EPA

Croatia's Ivo Karlovic will take on Jiri Vesely of the Czec Republic in the Duesseldorf Open semifinals.

DUESSELDORF, Germany (AP) - Ivo Karlovic of Croatia advanced to the Duesseldorf Open semifinals on Thursday, hitting 19 aces in a 6-4, 3-6, 6-3 win over defending champion Juan Monaco of Argentina.

The seventh-seeded Karlovic will meet Jiri Vesely of the Czech Republic on Friday. Vesely spoiled Jurgen Melzer's 33rd birthday by beating the Austrian 6-1, 6-1 to advance to his first ATP semifinal.

Melzer is playing again after missing seven months with a shoulder injury.

Denis Istomin of Russia upset third-seeded Andreas Seppi of Italy 6-3, 6-4 to record his 150th career win.

The match between top-seeded Philipp Kohlschreiber of Germany and qualifier Mate Delic of Croatia was interrupted twice by rain and finally abandoned because of darkness, with Kohlschreiber leading 7-5, 4-4. Delic is in his first tour-level event.

Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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