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"I believe myself," he said. "My serve takes me a long way.
"I think the serve is not only about what necessarily you can do with it, but it's how you step up.
"If you look at results, numbers besides names, then my serve has carried me a pretty long way."
However, another big server, South Africa's Kevin Anderson, who moved into the Queen's Club semi-finals with 18 aces of his own in a win over Guillermo Garcia-Lopez, believes Karlovic is the best of his big-serving rivals.
"On sheer numbers in the game, I think I'd have to give it to Ivo," the World No 17 said, ranking Karlovic, John Isner, Raonic and himself as the world's top four servers.
"I think Ivo's first serve is really good. On a second serve I think Isner is a bit tougher than Ivo."
"I think the serve is not only about what necessarily you can do with it, but it's how you step up.
"If you look at results, numbers besides names, then my serve has carried me a pretty long way."
However, another big server, South Africa's Kevin Anderson, who moved into the Queen's Club semi-finals with 18 aces of his own in a win over Guillermo Garcia-Lopez, believes Karlovic is the best of his big-serving rivals.
"On sheer numbers in the game, I think I'd have to give it to Ivo," the World No 17 said, ranking Karlovic, John Isner, Raonic and himself as the world's top four servers.
"I think Ivo's first serve is really good. On a second serve I think Isner is a bit tougher than Ivo."