Answered January 12th, 2020

I didn't find anything for this season, but 18 pitchers were tied for the most games pitched in a game with 8.0+ innings pitched and 2 or fewer runs allowed in 2019, with 1 game.

most season games with 8 ip by a pitcher this season in a game with 2 or fewer r
Interpreted as:
most season games with 8 or more ip by a pitcher this season in a regular-season game with 2 or fewer r

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