A team has finished a game with 15-21-2 runs-hits-errors line 9 times since 1897, most recently Detroit Tigers on 19 August 2015. That is about one every 49,222 team-games.
Box score for the most recent one ↗
15-20-0 15-20-1 15-20-3 15-20-5 15-20-2 15-20-4 15-21-2 15-21-3 15-21-4 15-21-1 15-21-0 15-22-1 15-22-6
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes