Answered February 25th, 2020

Since 1999, Baker Mayfield has the best passer rating by a Browns quarterback in a game, with a 151.3 rating against the Falcons on November 11, 2018.

highest passer rating in a game by a cleveland qb since 1999
Interpreted as:
highest passer rating in a regular-season game by a cleveland qb since 1999

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