these are things that I think are needed to be fixed in the future updates to make it a more realistic game :
1. When I'm playing as Federer against Nadal ,he uses backhand slices very often.the problem is that his slices are short and low which is difficult to handle but when i hit a backhand slice it looks like they're deeper and higher which is really odd considering the fact that Federer has the best backhand slices in tennis!
BTW I've changed Federer's Top spin to 0 while Nadal's is 100 but it's all the same

Also I don't know why there is no specific quality for slices because i think they're very different shots than regular backhand shots and require different skill but it sounds like in this game every player can hit slices just as good as other players. You can't use backhand slices as Federer do in his game and that's really a let down because it's really a big part of his game( you can't use it as a weapon like he does; it's just a defensive shot to keep you in the rally for a few more seconds!).
2. When I'm returning Nadal's service, i have to stay far behind the baseline (sometimes the player is outside of my view!) to be in the "Safe Zone" or at least not in the "Danger zone", and it really frustrates me when Nadal hit a drop shot right away while I'm miles away from the baseline. If you watch Federer's matches you can see that he almost always stands near the baseline but it's impossible to do so in this game.
thanks a lot & sorry for my bad English