Quick feedback: I kept instinctively trying to press the A/B/C on the actual court(?) even after realising it's at the bottom on the first one.

I would suggest either making those clickable, or styled less like buttons somehow, so they don't have such an affordance for being the thing to press.

Thanks for the feedback! The buttons on the actual court should also be clickable, doesn't it work for you? If so can you please tell me your device / OS you're testing it on?