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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ángel de Hoyos# | 0.79 | 1902-1910 | |
| 2 | Ángel Moreno# | 1.00 | 1902-1911 | |
| 3 | Normando Fraire# | 1.01 | 1902-1906 | |
| 4 | Aldo Rodríguez# | 1.05 | 1903-1914 | |
| 5 | Norberto Hernández | 1.07 | 1903-1914 | |
| 5 | Ordoño Ortega | 1.07 | 1904-1912 | |
| 5 | José López# | 1.07 | 1907-1914 | |
| 8 | Cameron Winter | 1.10 | 1901-1905 | |
| 8 | Vladik Ofitserov | 1.10 | 1906-1911 | |
| 10 | Scanlon O'Sullivan | 1.15 | 1901-1905 | |
| 11 | Louis Cohen | 1.16 | 1901-1913 | |
| 12 | Billy Evans | 1.19 | 1901-1912 | |
| 12 | Aidan Grant | 1.19 | 1901-1914 | |
| 14 | Luis Melchor# | 1.20 | 1906-1914 | |
| 15 | Luis de Paula | 1.22 | 1905-1912 | |
| 15 | Ewan Baxter | 1.22 | 1901-1914 | |
| 17 | Abenámar Martínez | 1.23 | 1903-1914 | |
| 17 | Balduino Anaya | 1.23 | 1905-1911 | |
| 19 | Jorge Flores# | 1.27 | 1906-1914 | |
| 20 | Martín León | 1.28 | 1902-1910 | |
| 20 | Matías Rivera# | 1.28 | 1903-1914 | |
| 20 | Braulio Paredes# | 1.28 | 1907-1914 | |
| 23 | Zacarías Sosa | 1.30 | 1904-1913 | |
| 24 | Ciro Robledo | 1.31 | 1902-1910 | |
| 24 | Lester Gill | 1.31 | 1901-1910 | |
| 26 | Rob Murphy | 1.32 | 1901-1911 | |
| 26 | Julio Morales# | 1.32 | 1907-1913 | |
| 28 | Zak Gardner | 1.33 | 1901-1910 | |
| 28 | Sloan Mahoney# | 1.33 | 1908-1914 | |
| 28 | Richard Russell | 1.33 | 1901-1906 | |
| 31 | Padraic Quinlevan# | 1.36 | 1901-1901 | |
| 32 | Kian Sells | 1.37 | 1901-1913 | |
| 33 | Ramón Carranza# | 1.38 | 1909-1914 | |
| 34 | Harry Irvine | 1.47 | 1901-1909 | |
| 35 | Aidan Clark | 1.49 | 1904-1910 | |
| 36 | Tony Stewart | 1.50 | 1901-1906 | |
| 37 | Ricardo Márquez | 1.51 | 1906-1913 | |
| 38 | Dominic Hague | 1.52 | 1901-1913 | |
| 39 | Eher Byrne | 1.55 | 1901-1906 | |
| 40 | Esteban Quezada# | 1.70 | 1906-1913 | |
| 41 | Miguel Gómez# | 1.74 | 1906-1914 | |
| 42 | Símaco Castrejón | 1.81 | 1909-1914 |
