A team has finished a game with 21-18-0 runs-hits-errors line 2 times since 1897, most recently Los Angeles Dodgers on 2 August 2018. That is about one every 221,502 team-games.
Box score for the most recent one ↗
20-28-0 21-14-1 21-17-3 21-17-1 21-17-2 21-18-4 21-18-0 21-19-2 21-19-0 21-20-1 21-20-2 21-20-0 21-21-4
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes