Answered February 25th, 2020

Since 1999, Baker Mayfield has the highest passer rating by a Browns quarterback in a season, with a 93.7 rating in his rookie season in 2018.

highest passer rating by a cleveland browns quarterback by season since 1999
Interpreted as:
highest passer rating with a minimum of 7 passing attempts per team game by a cleveland browns quarterback by season since 1999

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