A team has finished a game with 18 left on base 409 times since 1897, most recently Cincinnati Reds on 1 July 2021. That is about one every 1,083 team-games.
Box score for the most recent one ↗
14 15 16 17 18 19 20 21 22 23 24
The whole distribution — Runners Left on Base · All 18 shapes