Karlovic's Serve is Underhanded

Some would say any serve by Ivo Karlovic is under-handed since it seems like the 6 ft 10 in tennis player is serving from a tree. But in this 2007 match with Tommy Hass, Ivo literally goes under-handed to serve what may be the slowest ace is pro tennis history. I bet Ivo enjoyed this even more than his 153 MPH personal best. You can't see the actual serve until the replay, so be patient for a few seconds.