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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Addie Joss | 0.750 | 1902-1910 | |
| 2 | Babe Adams# | 1.486 | 1906-1916 | |
| 3 | Orval Overall | 1.588 | 1905-1913 | |
| 4 | Jesse Tannehill | 2.109 | 1894-1910 | |
| 5 | Joe Wood# | 2.139 | 1908-1916 | |
| 6 | Rube Waddell | 2.388 | 1897-1910 | |
| 7 | Christy Mathewson | 2.689 | 1900-1916 | |
| 8 | Bill Bernhard | 2.883 | 1899-1907 | |
| 9 | Jeff Tesreau# | 3.000 | 1912-1916 | |
| 10 | Deacon Phillippe | 3.031 | 1899-1911 | |
| 11 | Cy Young* | 3.041 | 1890-1911 | |
| 12 | Charles Bender# | 3.128 | 1903-1916 | |
| 13 | Dutch Leonard# | 3.203 | 1913-1916 | |
| 14 | Mordecai Brown | 3.222 | 1903-1916 | |
| 15 | Eddie Plank# | 3.250 | 1901-1916 | |
| 16 | Red Ames# | 4.091 | 1903-1916 | |
| 17 | Jack Pfiester | 4.211 | 1904-1911 | |
| 18 | Otto Hess | 5.283 | 1902-1914 | |
| 19 | Rube Marquard# | 5.982 | 1908-1916 | |
| 20 | Vean Gregg# | 6.993 | 1911-1916 |
