For the questions...
1. HC - USO, Miami and that Swedish court with the reflective surface
Clay - Madrid
Grass - The German one I think
Carpet - Paris
2. Djokovic & Bouchard
3. What has been said before like with motions (accuracy and variety) and more accurate player stats (Murray having a better FH than BH), but also on my wishlist is hopefully some more official licenses of the venues. Top of my list would be Monte Carlo. From picturesque seaside courts to an indoor venue half covered in shadows in TS4... :neutral: and Wimbledon of course if it was possible.
A wider range of gear would be nice (Wilson?).
Characters I would like added... some guys like Soderling, Monfils, Tsonga, Del Potro and Kohlschreiber :razz:
Option to play career as a pro player. Deeper kind of career mode too, I heard Grand Slam Tennis 2 will have quite a good one.
Fix the World Tour side of the online play too, those barely functional lobbies
When has there ever been a tennis video game with a realistic amount of winners and errors? Really, I don't know of any.
This extends to sports games in general too, especially once you are good enough. Like if you hit with perfect timing almost all the time in TS4, you shouldn't make many errors. If the CPU made more errors it might become too easy. It would be for me, at least.
They could have a bit higher error rate, however. Not something random though, rather something less forgiving.
Don't know much about GST2 (only a few people have played the demo, even) but I can recommend TS4. I guess it would be cheaper too?