I have taken some screenshots and made some motion .gif files showing examples of this problem. I'd be glad to send you the screenshots showing what I am referring to. The hit zone is fine, it is just when the the racket doesn't line up to the ball, but it hits anyway, sometimes it is worse than others. Sometimes it looks like a delayed reaction to the swing, those aren't so bad, but there are ones where the CPU player looks like he isn't even hitting it, but the ball hits an invisible wall and comes back anyway.
Here are two .gif files I made showing the issue about racket to ball collision in TE2013.
As you can see, especially in the second .gif, the racket swing isn't lining up to the ball, but the ball is acting like it's hit anyway.
I really think TE2013 is a fantastic tennis game. I purchased the Tennis Elbow last year but only recently started getting into it. I am really enjoying the game but this is one thing that I noticed when playing and viewing replays. I hope those screenshots in motion illustrate the post I had about it the racket to ball collision. Do you think this issue can be improved?