Answered January 11th, 2020

Gary Marangi has the worst passer rating in a game with 28+ passing attempts, with a 0.0 rating against the San Diego Chargers on November 21, 1976.

worst player qbr in nfl history in a game with a minimum of 28 attempts
Interpreted as:
worst player qbr in NFL history in a regular-season game with a minimum of 28 passing attempts

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