Here are some videos of me serving over 100 mph. Some information before we begin: Racquet : PS 85 String: Ashaway Kevlar Crossfire II , 16 gauge Tension: 70 lbs. Tennis Balls: regular Wilson/Penn balls 1-3 weeks old pulled out of my bag. Shoe: Oscillates, LOL Video Camera: Kodak 30 fps Radar Gun: speed track II. The back fence is a little over 21 feet from the baseline. Here are two serves I took as soon as I got the radar gun. It was dark out but I just could not wait to play with my new toy. One is 103 MPH, and the second is 107 MPH. http://www.youtube.com/watch?v=C2SC9Pmp-V8 http://www.youtube.com/watch?v=dvKjCsXQggc Lastly, not sure if you could tell but I was unable to jump and explode into the ball as the arch on my left foot is bruised. As a result, I don't leave the ground and land inside the court as it was too painful. Enjoy!