Philip Rivers had the highest completion percentage by a quarterback in a game with 14+ passing attempts in 2018, at 96.6 percent against the Cardinals on November 25, 2018.

highest completion percentage in a game by a qb with 14 passes attempts in the 2018 nfl season
Interpreted as:
highest completion percentage in a regular-season game by a qb with 14 or more passes attempts in the 2018 NFL season

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