Karlovic ousts Youzhny in Halle tennis match
Russia's Mikhail Youzhny hits a return to Czech Republic's Radek Stepanek during their French tennis Open second round match at the Roland Garros stadium in Paris on May 28, 2014 - by Pascal Guyot
The giant Croat, ranked 33rd in the world, sent down 22 aces in the short space of time in a 73-minute first round match with the Russian powerless to do anything about it.
Karlovic set up a second round tie against Taiwan's Yen-Hsun Lu who defeated Croatian qualifier Mate
Pavic 7-6 (7/2), 6-7 (11/13), 7-6 (7/5) in a match that lasted 2 hours 44 minutes.
There was an early exit also for another top grasscourt player in the form of Frenchman Richard Gasquet who fell 6-4, 6-4 to Robin Haase of the Netherlands.
A former semi-finalist at Wimbledon, Gasquet has been suffering with a bad back in recent weeks and he re-injured his right shoulder in training for Halle.
"I am feeling the pain all the time and I can't get that out of my head," he said, adding that he woud travel to Eastbourne on Friday to play in the tournament there in the week preceding Wimbledon.
Top seed and newly-crowned French Open champion Rafael Nadal will play his second round tie on Wednesday as will second seed Roger Federer.
Both had first round byes.