Has a Minor League Baseball game ever ended 20-18?

Exactly once. On April 13, 2019, Lehigh Valley IronPigs beat Rochester Red Wings 20-18, and no Minor League Baseball game before or since has ended that way. When it happened it was a scorigami, the first 20-18 in league history.

Where 20-18 sits among nearby Minor League Baseball scores. Deeper blue means a score has happened more often; the outlined cell is the new one.

That makes 20-18 the 292nd most common final score out of 335 that have ever occurred in Minor League Baseball. One point away, 21-18 has happened never and 20-19 has happened 3 times.

Every 20-18 in Minor League Baseball history

Date	Result	Season
2019-04-13	Lehigh Valley IronPigs over Rochester Red Wings	2019

Open the Minor League Baseball grid at 20-18