You make it and your opponent returns the ball back deep. The situation now becomes "both back" and your shot selection should be "rally."
Say you mis-hit the ball and it drops short enough to invite your opponent to come to the net. Now your situation changes to "defend" and your shot selection will depend upon how much pressure you are under (some situations mean that you are under more pressure than others).
Or, say your opponent hits a really great approach shot that is hard and wide and she is closing in on the net. Your situation now is to "defend" (to the max) and your shot selection is pretty much to lob and hope to get at least another shot.
If her shot hadn't been so good on the approach, your situation would still have been "defend," but you could easily have chosen to pass instead of lob because the situation was not as desperate as the one I outlined before.
It's all about simplifying and then maximizing the information you get into two distinct, yet related areas that work for all tennis players at any time -- situations and shot selection.
And by starting off with putting the shots you are comfortable with into each of the appropriate phases you very quickly have a game plan that you can execute regularly and consistently -- and those are two words that are huge when it comes to tennis success!
Click here for free access to three tennis instructional videos that will help turn your game around -- Inverted Funnel, Game Filtration and the Tennis Turnaround Toolkit.