The best tennis game by far is Tennis Elbow: http://www.managames.com/tennis/game_en.html
Get that, then install the ITST patch from here: http://www.intertopspintour.net/foru...f=1047&t=16709
Here's a video sample (from a slightly older version of the patch):
The reason why it's good is because it's simulation (rather than arcade that TS4 became and all the Virtua Tennis games are).
The gameplay is super in-depth. I've played TS4 like twice in the year since I got Tennis Elbow.
You can hit shots like volley lobs, smash dropshots, half-volley dropshots, you can add sidespin to your FH DTL, and so on. You can control the amount of topspin on your kick serve, or slice, etc. Amazing shot selection that no other tennis game I've played has.