Unfortunately, there's no 64-bit version of TE2013.
You can either :
- try to downgrade your MacOS version (I don't know if it's possible)
- install Windows and dual boot to it to play the Windows version of TE2013 (if you bought the game from managames.com, your Key works with it)
- buy TE4 ; but it's only in its Prototype phase for now, and you need a bit powerful GPU or IGP to run it, and there's currently no demo ; more info here : topic15-30551.php
- try Tennis Elbow Manager 2 : if you don't like management, you can lower the coaching difficulty to its minimum, so it'll be easy & fast to manage your player ; and you should activate "Settings -> 3D Match -> Manual Player Controls" ; you can get the demo from here : https://www.managames.com/tennismanager