Answered January 12th, 2020

Sandy Koufax threw in 3 games when pitching at least 6 innings and allowing 1 or fewer earned run in the 1965 World Series.

who was the most recent pitcher to have at least three games with 6 innings pitched and 1 or fewer earned runs in a season in a world series
Interpreted as:
Who was the most recent pitcher to have at least three games with 6 or more innings pitched and 1 or fewer earned runs in a season in a world series?

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