Did you know that in 2004 Barry Bonds of the San Francisco Giants became the first and only Major League player in history to have a single season on base percentage greater and 0.599?
The code to write the single season on base percentage league splits was developed in 2005, launched during 2006 and made possible by your support — please continue helping us create these kinds of pages by supporting our site.
The American League single season record for on base percentage was set in 1941 by Ted Williams of the Boston Red Sox. The National League single season record for on base percentage is on this page. Is either the Career Leader for On Base Percentage?