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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Jesús Castellón# | 0.84 | 1910-1914 | |
| 2 | Harland Vaillancourt | 0.92 | 1904-1911 | |
| 3 | Francisco Lerma | 0.94 | 1901-1911 | |
| 4 | Ernesto Lemus | 0.99 | 1906-1914 | |
| 5 | Andrónico Lona | 1.00 | 1901-1914 | |
| 6 | Gumersindo Rodríguez# | 1.01 | 1902-1913 | |
| 6 | Apolonio Ruiz | 1.01 | 1901-1911 | |
| 8 | Tobías García | 1.02 | 1901-1910 | |
| 9 | Don Day | 1.08 | 1904-1914 | |
| 10 | Matt Kirby | 1.11 | 1904-1912 | |
| 11 | Efraín Jurado# | 1.14 | 1905-1909 | |
| 11 | Roberto Quevedo# | 1.14 | 1909-1914 | |
| 13 | Lorenzo Álvarez | 1.15 | 1902-1911 | |
| 14 | Luis Fernández# | 1.17 | 1907-1912 | |
| 15 | Paul Keys | 1.19 | 1901-1909 | |
| 16 | Telémaco Aquino# | 1.20 | 1904-1914 | |
| 17 | Santiago Romero | 1.21 | 1902-1910 | |
| 18 | Lucas Galindo | 1.22 | 1901-1911 | |
| 19 | Teócrito Salinas | 1.24 | 1901-1913 | |
| 19 | Celino Zambrano# | 1.24 | 1904-1913 | |
| 19 | Eduardo Ayala | 1.24 | 1904-1911 | |
| 19 | Gabriel Gutiérrez | 1.24 | 1901-1913 | |
| 23 | Príamo Díaz | 1.26 | 1910-1914 | |
| 23 | Lisandro Acevedo# | 1.26 | 1902-1914 | |
| 25 | Federico Moya | 1.27 | 1905-1914 | |
| 25 | Miguel Acevedo | 1.27 | 1904-1912 | |
| 25 | Ed Townsend | 1.27 | 1901-1913 | |
| 28 | Fulco Quiñones# | 1.30 | 1901-1914 | |
| 29 | Édgar Martínez# | 1.31 | 1903-1914 | |
| 30 | Hernán Gutiérrez# | 1.34 | 1907-1914 | |
| 30 | Steve Noonan# | 1.34 | 1906-1914 | |
| 30 | Jon Schofield | 1.34 | 1902-1909 | |
| 33 | Alvin Stamp | 1.36 | 1904-1909 | |
| 34 | Ken Crabbe | 1.39 | 1902-1904 | |
| 34 | Daniel Florentino | 1.39 | 1902-1910 | |
| 36 | Jaime Bautista | 1.47 | 1906-1913 | |
| 37 | Nicolás Lerma | 1.49 | 1901-1912 | |
| 38 | Anatolio Aguillón | 1.50 | 1901-1910 | |
| 39 | Craig McGaughey | 1.54 | 1901-1912 |
