Key
| Year | Links to the corresponding "year in baseball" or "Major League Baseball season" article |
| Leader | Player with the lowest earned run average (ERA) in the league |
| Runner-up | Player with the second-best ERA in the league |
| League | Denoted only for players outside of the modern major leagues |
| † | Member of the National Baseball Hall of Fame and Museum |
Read more about this topic: List Of Major League Baseball Earned Run Average Champions
Famous quotes containing the word key:
“It so happened that, a few weeks later, “Old Ernie” [Ernest Hemingway] himself was using my room in New York as a hide-out from literary columnists and reporters during one of his rare stopover visits between Africa and Key West. On such all-too-rare occasions he lends an air of virility to my dainty apartment which I miss sorely after he has gone and all the furniture has been repaired.”
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