Footnotes
- a Recognized "major leagues" include the current American and National Leagues and several defunct leagues—the American Association, the Federal League, the Players' League, and the Union Association.
- b In baseball scorekeeping, "K" is the traditional notation for the strikeout.
- c In 1939, Claude Passeau played the entire season for the Cincinnati Reds, while co-leader Bucky Walters was traded from the Philadelphia Phillies to the Chicago Cubs mid-season.
Read more about this topic: List Of Major League Baseball Strikeout Champions