Bases on balls per nine innings pitched


In baseball statistics, bases on balls per nine innings pitched or walks per nine innings is the average number of bases on balls, given up by a pitcher per nine innings pitched. It is determined by multiplying the number of bases on balls allowed by nine, and dividing by the number of innings pitched. It is a measure of the bases on balls ability of a pitcher.

Leaders

All but one of the top 25 single-season leaders in BB/9IP through 2018 pitched in the period of 1876-84. George Zettlein was the all-time single-season leader, followed by Cherokee Fisher and George Bradley. The highest single-season modern day baseball performance was by Carlos Silva.
The all-time career leaders in BB/9IP through 2019 were Candy Cummings, Tommy Bond, and Al Spalding, all of whom played in the 1870s and 1880s.
The active career leaders in BB/9IP through 2019 were Masahiro Tanaka, Jordan Zimmermann, and Corey Kluber.