A team has finished a game with 6-18-2 runs-hits-errors line 16 times since 1897, most recently Seattle Mariners on 29 July 2004. That is about one every 27,687 team-games.
Box score for the most recent one ↗
6-17-4 6-17-0 6-17-5 6-18-3 6-18-1 6-18-0 6-18-2 6-18-6 6-18-4 6-19-1 6-19-2 6-19-3 6-19-6
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes