Bases on balls per nine innings pitched

In baseball statistics, bases on balls per nine innings pitched (BB/9IP or BB/9) or walks per nine innings (denoted by W/9) is the average number of bases on balls, (or walks) 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.[1] It is a measure of the bases on balls ability of a pitcher.

Leaders
Candy Cummings, all-time career leader in BB/9IP

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 (0.2308 in 1876), followed by Cherokee Fisher (0.2355 in 1876) and George Bradley (0.2755 in 1880).[2] The highest single-season modern day baseball performance was by Carlos Silva (0.4301 in 2005).[2]

The all-time career leaders in BB/9IP through 2019 were Candy Cummings (0.4731), Tommy Bond (0.4787), and Al Spalding (0.5114), all of whom played in the 1870s and 1880s.[3]

The active career leaders in BB/9IP through 2019 were Masahiro Tanaka (1.7887), Jordan Zimmermann (1.9205), and Corey Kluber (1.9588).[4]

gollark: There's also the automatic Forge backup, which seems to be corrupted somehow.
gollark: ```world-2019-04-07_02-38-16.zip world-2019-04-07_05-38-16.zip world-2019-04-07_08-38-16.zipworld-2019-04-07_03-08-16.zip world-2019-04-07_06-08-16.zip world-2019-04-07_09-08-16.zipworld-2019-04-07_03-38-16.zip world-2019-04-07_06-38-16.zip world-2019-04-07_09-38-16.zipworld-2019-04-07_04-08-16.zip world-2019-04-07_07-08-16.zip world-2019-04-07_10-16-45.zipworld-2019-04-07_04-38-16.zip world-2019-04-07_07-38-16.zipworld-2019-04-07_05-08-16.zip world-2019-04-07_08-08-16.zip```These are all *after* it broke.
gollark: Yes, but apparently I didn't configure them to go back long enough.
gollark: I really hope I haven't broken anything irrecoverably...
gollark: I can do that tomorrow. In bed presently.

References
  1. Strikeout and Walk Rates | Sabermetrics Library
  2. Single-Season Leaders &amp Records for Bases On Balls per 9 IP | Baseball-Reference.com
  3. Career Leaders &amp Records for Bases On Balls per 9 IP | Baseball-Reference.com
  4. Active Leaders &amp Records for Bases On Balls per 9 IP | Baseball-Reference.com


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