Assuming that your first post isn't trolling, I'll give you a brief answer.
MTM I believe stands for Oscar Wegner's Modern Tennis Methodology. It is the way Wegner teaches tennis and supposedly is based on his observations of how pros play.
It doesn't make sense to ask if Agassi or Courier play MTM, as neither were Wegner's students as far as I know. If anything, you'll need to ask Wegner if he is basing the technique he is teaching on the model of some pro player.
There are plenty of other tennis professionals who teach what they'll claim to be "modern" pro technique and many of these same people disagree with Wegner. So, unless you are just looking to start a fight, it is best to look at what Wegner teaches and then compare it to what you do. If you really want to know for certain, I advise taking some classes from Wegner or one of his coaches and ask them.