Answered January 12th, 2020

Between the 2000 and 2010 season, Ben Sheets had the best K/BB with 15+ starts in a season, with 10.55 K/BB in 2006.

highest k/bb pitching in a season from 2000 to 2010 with 15 games started
Interpreted as:
highest k/bb by a player pitching in a season from 2000 to 2010 with 15 or more games started

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