Scrappers CupTennis ladder manager

A ranking and match-tracking app for a tennis ladder. Winners take the loser's rung, which keeps the ladder moving and makes every match matter.

Admins enter set-by-set scores from their phones. The ranking engine normalizes gaps and duplicates, replays the full match history chronologically to rebuild standings after an edit, and handles players dropping out and rejoining without losing their history. Next.js and Supabase with an email-allowlist auth model, with unit and integration tests in Vitest.