At Legg Mason, I tried out the serve speed cage. You get three serves and the radar gun is basically behind net-wall right in the middle part, facing out to the server. The three serves I took kept landing upwards and to the left of the target. I guess i was trying too hard and lost control. It registered in the mid-70s. I thought no way are my serves that slow. I also saw a asian girl who looked to be a teenager hit in the 80s and her serve didn't seem that powerful. Then I got back in line and tried again. First serve I took was way off to the left and again in the 70s. Then I hit one right near the radar target and it registered at 87. Then I did another one that registered at 90. Then later on I saw some middle-aged hack hit in the upper 90s with a serve that didn't look all that powerful. I don't get it really. I think maybe I wasn't hitting cleanly because I was trying to kill the ball, but still I was disappointed in my speed compared to what some of the faster serves looked like. I guess I'm a little skeptical about the accuracy given how much of an effect 2-3 feet of placement makes in the calculation. I consider my first (flat) serve a weapon, and it usually hits the fence on the first bounce. I always thought I could crack 100, from comparing what I've seen at pro events where the serves are clocked and I can sort of cross-reference wiith my own serve. I guess I was wrong.