I didn't get the button functionality on each side. Explain in details what buttons you need and how they have to work. As it is weekend I might write a sample code for you.
I don't watch tennis and hence I don't know how tennis score board works. If you know how a tennis score board works then mention it here and I might write a C Code for you.
I have design this circuit and I think the buttons can be further reduced.
Go and check a real Score board and get info about what buttons they have and what are their functions.
Looking at your schematic (post #7), and latest layout, it appears you decided not to multiplex the 7-segment displays. Is this the case?
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