Ivo Karlovic, of Croatia, returns the ball to Roger Federer, of Switzerland, during a match at the Sony Open tennis tournament, Friday, March 21, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
Lynne Sladky
May 22, 2014

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.

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HOLE YARDS PAR R1 R2 R3 R4
OUT
HOLE YARDS PAR R1 R2 R3 R4
IN
Eagle (-2)
Birdie (-1)
Bogey (+1)
Double Bogey (+2)