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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Émile Lucas# | 1.11 | 1987-1990 | |
| 2 | Mitchell Hapgood | 1.23 | 1911-1914 | |
| 3 | Wayne Manuel | 1.32 | 1928-1931 | |
| 4 | Jeremiah Buffy | 1.36 | 1941-1945 | |
| 5 | Tom Keels | 1.43 | 1927-1930 | |
| 6 | Joost Hekman | 1.49 | 1941-1943 | |
| 7 | Don Makeever | 1.57 | 1939-1941 | |
| 8 | Payton Bowden | 1.62 | 1911-1915 | |
| 9 | Clifton Scott | 1.63 | 1932-1935 | |
| 10 | Seif Abdul-Hakam | 1.65 | 1977-1981 | |
| 11 | Flipp Usachenko | 1.72 | 1972-1976 | |
| 12 | Bodil Lorenz | 1.96 | 1939-1943 | |
| 13 | Kai Hill | 1.97 | 1933-1936 | |
| 14 | Ferry de Gunst | 1.99 | 1933-1936 |
