19 teams are tied for the fewest third-down conversions in a game, with 0 conversions. The first three are the New York Giants on January 3 and on October 7, 2018, the Las Vegas Raiders on December 26 and on September 24, 2017 and the Philadelphia Eagles on November 15.

fewest third down conv by a team in a game
Interpreted as:
fewest third down conv by a team in a regular-season game

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