Jakub Mensik, Miami champion, was going to pull out of the tournament an hour before his first match

He struck a 156 mph serve in the fourth set of a doubles match against Germany in the Davis Cup on Saturday, breaking Andy Roddick's previous record of 155 mph.

I noticed that while serving, saw it on the screen,'' said the 6-foot-10 Karlovic, the tallest player on the ATP circuit.It is really great.''

Karlovic and Ivan Dodig lost 3-6, 5-7, 6-3, 6-4 in the doubles against Christopher Kas and Philipp Petzschner. Germany later won the first-round series 3-2.

Roddick also blasted his serve in the Davis Cup, against Vladimir Voltchkov and Belarus in 2004.

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