Sumo fan here, this is cool. UI is great. I assume you know about sumodb? I don't say that to discourage you, but people are tracking stats.

Since you are good at UI, here's something I would really like: a Natto-style page for each bout that I can manually page through as I watch the basho. Since Natto is underground, I have to watch the basho on NHK or Abema or via Kintamayama - all fine, but I miss the Natto graphics. If you could do that in a way that I could tap through each match, I'd use it every day of the basho and I think so would everyone on r/sumo.

BTW if you don't know what I'm talking about, reach out and I will explain.