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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | H9 | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Babe Adams# | 5.94 | 1906-1915 | |
| 2 | Orval Overall | 6.09 | 1905-1913 | |
| 3 | Addie Joss | 6.25 | 1902-1910 | |
| 4 | Jesse Tannehill | 6.89 | 1894-1910 | |
| 5 | Dutch Leonard# | 7.97 | 1913-1915 | |
| 6 | Eddie Plank# | 8.00 | 1901-1915 | |
| 7 | Christy Mathewson# | 8.63 | 1900-1915 | |
| 8 | Jeff Tesreau# | 8.75 | 1912-1915 | |
| 9 | Cy Young | 8.88 | 1890-1911 | |
| 10 | Charles Bender# | 9.05 | 1903-1915 | |
| 11 | Rube Waddell | 9.35 | 1897-1910 | |
| 12 | Joe Wood# | 9.36 | 1908-1915 | |
| 13 | Otto Hess | 9.68 | 1902-1914 | |
| 14 | Red Ames# | 9.75 | 1903-1915 | |
| 15 | Deacon Phillippe | 10.19 | 1899-1911 | |
| 16 | Bill Bernhard | 10.22 | 1899-1907 | |
| 17 | Mordecai Brown# | 10.28 | 1903-1915 | |
| 18 | Jack Pfiester | 11.15 | 1904-1911 | |
| 19 | Vean Gregg# | 12.04 | 1911-1915 | |
| 20 | Rube Marquard# | 12.45 | 1908-1915 |
