Answered January 12th, 2020

Since 1960, Larry Biittner has the highest K/BB with 400+ plate appearances in a season, with 3.00 K/BB in 1977.

most so/bb in a season by a batter 400 pa since 1960
Interpreted as:
most so/bb in a season by a batter 400 or more pa since 1960

See Trending MLB Searches