A team has finished a game with 21-18-4 runs-hits-errors line 1 time since 1897, most recently Boston Red Sox on 29 May 1912. That is about one every 443,004 team-games.
Box score for the most recent one ↗
20-28-2 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
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes