HALLE, Germany -- Ivo Karlovic fired a record 45 aces in upsetting the third-seeded Tomas Berdych 7-5, 6-7 (8), 6-3 while Kei Nishikori also progressed to the Gerry Weber Open semifinals on Friday.

The challenge of returning Ivo Karlovic’s serve is among the greatest in tennis, and with the best in the game often struggling to get his notoriously big delivery back in play, one could say it would ...

Ivo Karlovic set the world record for fastest serve on Sunday during a Davis Cup match for Croatia. The 6-foot-10 Croat nailed a serve 156 mph, breaking Andy Roddick's previous record of 155 mph.

Ivo Karlovic, the towering Croatian known for his booming serve, has officially announced his retirement from tennis more than two years after playing his last tournament match. The 2.11-meter (6 foot ...

The International Tennis Federation says Croatia's Ivo Karlovic has broken the world record for the fastest serve during a Davis Cup match against Germany. He struck a 251 kph (156 mph) serve in the ...

Ivo Karlovic tells The Tennis Space that he doesn’t necessarily buy that Australia’s Sam Groth broke the world’s fastest serve record at a Challenger in Korea last month. Groth allegedly hit a 163 M.P ...

IVO Karlovic served his way into the US Open record books when he fired 61 aces in his win over Lu Yen-Hsun of Taiwan. Karlovic, 37, beat the previous best of 49 aces for one match in New York served ...

WASHINGTON (AP) Even Ivo Karlovic willingly admits that whatever success he has on a tennis court is due mainly to his big serve. Well, that one stroke is in fine form at the moment, and so is ...

Coming off of a match where he literally exerted no energy and playing an unranked opponent, it would be easy for Roger Federer to fall into a bad trap. If he does, his stay in Australia will be far ...