I really should be catching up on my readings but since I've wasted nearly a whole afternoon already.... 1. Ivanisevic 2. Karlovic 3. Sampras 4. Gonzales 5. Krajicek 6. Arthurs 7. Roddick 8. Newcombe 9. Isner 10. McEnroe 11. Tanner 12. Becker 13. Philippoussis 14. Stich 15. Curren 16. Zivojinovic 17. Raonic 18. Rusedski 19. Federer 20. Noah Honorary mentions: McLoughlin, Maurice - perhaps the first distinguished cannonball serve in tennis history Tilden - yet another storied power serve, which he bolstered with spin and accuracy Vines - by all accounts, the best and fastest serve of the pre-WWII era Kramer - in addition to a formidable first serve, perhaps the best second serve before Newcombe and Sampras Denton - his unusual service motion notwithstanding, could bring enormous heat Edberg - for his legendary kicker, arguably the best ever for serve-and-volley Johansson, Joachim - Denton of the 2000s As you can see I've added Zivojinovic, moved Curren up a notch and, as much as it pains me, dropped Noah all the way down to #20. I've been watching some Bobo clips lately and not only was Datacipher (who again has nothing to do with a certain current poster) right that the Serb probably had a bigger serve than Becker, I now see that he had a pretty damn good 2nd serve himself. Bobo might well move up further in my future updates, while Noah might drop out of the list altogether and just be given an honorary mention. And Curren continues to impress both in footage and in service stats. Also one thing I've noticed about Mac is that his stats in '91 in '92 are actually pretty mediocre, showing just about 82% of service games won. Now we know that by this time Mac was way over the hill, but considering that a player's service game usually doesn't decline so sharply as his return game I do wonder if his reputation precedes the actual strength of his serve. If anyone's got his stats from his heyday (1984 most of all, but from before '86) please don't hesitate to share them with us. And here are a few of the servers we have yet to investigate further (listed by order of birth): Gerald Patterson (1895) Yvon Petra (1916) Geoff Brown (1924) Bob Falkenburg (1926) Mike Sangster (1940) Frank Froehling (1942) Stan Smith (1946) John Alexander (1951) John Feaver (1952) Scott Carnahan (1953) Chip Hooper  Again some of these names like Patterson and Falkenburg might be worth an honorary mention, and perhaps more recent ones like Smith and Hooper can be ranked somewhere. As always feel free to chime in preferably with stats, news reports and firsthand accounts if available. Much obliged! P.S. From now on I'll try to update the OP as well so first-time visitors know what to expect.