Answered January 12th, 2020

Since 1997, Jason Giambi has the most walks per strikeout for the Athletics with 300+ plate appearances in a season, with 1.55 in 2001.

most bb / so in a season by a player for the athletics 300 pa since 1997
Interpreted as:
most bb / so in a season by a player for the athletics 300 or more pa since 1997

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