Answered January 12th, 2020

I didn't find anything for this season, but 25 pitchers were tied for the most games pitched in a game with 1.0+ inning pitched and exactly 0 runs allowed in 2019, with 1 game on September 29.

most season games with 1 ip by a pitcher this season in a game with 1 g and 0 r
Interpreted as:
most season games with 1 or more ip by a pitcher this season in a regular-season game with 1 or more g and 0 r

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