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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OOPS | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Addie Joss | .4765 | 1902-1910 | |
| 2 | Babe Adams# | .4859 | 1906-1915 | |
| 3 | Jesse Tannehill | .5210 | 1894-1910 | |
| 4 | Orval Overall | .5556 | 1905-1913 | |
| 5 | Cy Young | .5819 | 1890-1911 | |
| 6 | Eddie Plank# | .5857 | 1901-1915 | |
| 7 | Jeff Tesreau# | .6343 | 1912-1915 | |
| 8 | Christy Mathewson# | .6363 | 1900-1915 | |
| 9 | Charles Bender# | .6420 | 1903-1915 | |
| 10 | Deacon Phillippe | .6433 | 1899-1911 | |
| 11 | Rube Waddell | .6627 | 1897-1910 | |
| 12 | Dutch Leonard# | .6672 | 1913-1915 | |
| 13 | Mordecai Brown# | .6874 | 1903-1915 | |
| 14 | Red Ames# | .7080 | 1903-1915 | |
| 15 | Joe Wood# | .7128 | 1908-1915 | |
| 16 | Otto Hess | .7299 | 1902-1914 | |
| 17 | Bill Bernhard | .7724 | 1899-1907 | |
| 18 | Jack Pfiester | .7864 | 1904-1911 | |
| 19 | Rube Marquard# | .8144 | 1908-1915 | |
| 20 | Vean Gregg# | .8822 | 1911-1915 |
