A team has finished a game with 18-18-1 runs-hits-errors line 4 times since 1897, most recently St. Louis Cardinals on 20 July 2018. That is about one every 110,751 team-games.
Box score for the most recent one ↗
18-17-2 18-18-3 18-18-4 18-18-5 18-18-0 18-18-2 18-18-1 18-19-0 18-19-1 18-19-4 18-19-5 18-19-2 18-19-3
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes