While browsing some YouTube-Videos on the Kick Serve I stumbled across this interesting technique by former ATP Top 100 Pro Jeff Sulzenstein: http://www.youtube.com/watch?v=j34COa_LFKg http://www.youtube.com/watch?v=cPQVksgk-WE He calls it the dirty diaper. He's basically suggesting not pronating for the kick serve, but instead going over the top of the ball so the strings end up pointing to the player instead of the side. It's kind of hard to explain, you have to watch the video yourself. After reviewing a recent video of my own kick serve, I noticed that I've been using this for quite some time without even noticing it. Now I'm wondering if I should keep it or rather go for the classic pronation approach? My kick isn't exactly very reliable at the moment, but then again, the problem could very well be somewhere else in my motion. I can't recall ever seeing a pro hit his kick serve like this, so I'm a little skeptical. What do you guys think?