Hello, Manu!
I just played the new version of TE4, after a couple of months without playing it. Some things I noticed and some questions I have, if I may:
1) It seems every match is always using the same 3D court. This doesn't happen in 2D mode. The issue is present in both practice and world tour modes. Also, I didn't understand the difference between changing court surface and stadium. Anyway, whatever I change, the 3D court is always the same. I guess it is a bug with the latest build.
2) What does that little arrow mean below short-term form and energy? Is it a threshold beyond which energy and breath, respectively, stop fully recovering?
3) This is something I felt since I played TE4 for the first time, but I think I never posted it here. It seemed to me that my serve was too effective. When I play against an opponent similar in skills to me, I can easily confirm my serve (playing in Pro 10). Too many aces and return errors from them. I started a career with a very weak player and played against an opponent with stats about 50-60% overall, and I managed to lose 3-6/4-6. In TE2013, I would barely win a game in this scenario (just to be clear, I didn't have any skill above 30%). Is this correct or are you still fine-tuning it?
4) I see that my player doesn't have a "Stress" bar. Doesn't it affect my player? And how does it affect the computer-controlled player? It seemed pretty random to me, the bar filled and got empty out of nowhere, it didn't seem related to crucial moments of the match.
5) I'm not sure if this is planned or if I mentioned this before here, but I remember from playing Jimmy Connors Pro Tennis Tour (SNES) that game had a very simple system to add rain probability. It was just simple as forcing you to stop the match, sending you to menus, and you just had to press a button to be back at the match. Although simple, I found it very nice to add a bit more realism. Maybe you could add something like that to affect focus of the players, but I don't know if it is planned or if it would be hard to do it. So, just a small sugestion

And a final question: can I update the Portuguese translation and send the file to you? There are lots of new untranslated sentences now.
Cheers!