seriously Isner and Raonic? lol... definitely not isner and raonic unless he wins a grandslam in the next few years, im writing him off too.
karlovic just had a serve. goran was similar in terms of a very powerful serve, but goran had a much more complete game and he didn't get to win a slam until the 2001 wimbledon final.
IMO: goran's serve probably would have been easily in the 150s with today's racket technology
Wimbledon 2004 Final. The fearless, hard hitting, fiery young 21 year old Andy Roddick.