What does IRS stand for?

Inherited Runners Scored (baseball; runner on base who scores after a new pitcher enters)

This definition appears very rarely and is found in the following Acronym Finder categories:

Slang/chat, popular culture

Other Resources:

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Samples in periodicals archive:

More telling was that only four of 28 inherited runners scored off him (14.

Francona finds Red Sox's road woes 'perplexing'

It's disappointing, but what I look at even more than batting average is my first batter faced, which (stinks), and my inherited runners scored, which (stinks).

DODGERS NOTEBOOK: MARTIN UPSET WITH HIMSELF