Let tennis pros Joe Perez and Kirk Moritz explain what "no man's land" is in tennis in this Howcast video.
Joe Perez: What is "No Man’s Land" in tennis?
Well basically, the most fundamental description of "no man’s land" is the area on the tennis court between the service line and the back base line. That general area is called "no man’s land."
Why? Well, you’re not supposed to be there, really. It’s not always a great place to stand. The reason it’s not a good place to stand is that good tennis players generally are taught to hit their balls land in no man’s land. Which means that if you’re standing in no man’s land, a lot of times you’re going to have to hit the ball when it’s at your toes. Really hard shot to hit.
So pros will teach their students not to stand in no man’s land. However, there are times when it’s good. And Kirk’s going to talk about that.
Kirk Moritz: If you’re playing a player who has a weak serve stand a couple of yards inside the baseline so that you have an easy chance to get to that weak shot. No man’s land is really about when you hang out in that area of the court for more than one shot. Offensive players are often in what, technically, we call no man’s land. But they’re striking the ball aggressively and they’re clearing out of the zone. When you park there, it’s a "no parking zone." That’s when it becomes no man’s land. Okay?
Joe: That’s a very good point. And, invariably, a lot of shots can be executed there great. Like a drop shot. And that’s a great area to hit a drop shot. But, like Kirk said, if you hit the drop shot and stand there you’re in for some trouble.
So that’s "No Man’s Land" in tennis.