Ivo Karlovic hits record 45 aces and books Halle Open semi-final spot with win over Tomas Berdych

Ivo Karlovic earned a place in the Halle Open semi-finals on Friday Karlovic beat Tomas Berdych and hit a record 45 aces on way to victory The Croatian admitted he didn’t know what was more important - a place in the semi-final or breaking the ace record Top seed Roger Federer takes on Florian Mayer later on Friday