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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Félix Jiménez | 0.55 | 2038-2040 | |
| 2 | Manuel Ruíz | 0.59 | 2037-2048 | |
| 3 | Alejandro Cruz | 0.60 | 2051-2052 | |
| 4 | Bill Keefe# | 0.74 | 2045-2046 | |
| 5 | Takeo Aoki | 0.76 | 2033-2035 | |
| 6 | Aras Yilmanz | 0.80 | 2045-2050 | |
| 7 | Juan Cruz# | 0.82 | 2045-2047 | |
| 8 | Nick Rivers# | 0.86 | 2050-2053 | |
| 9 | Jarred Perkins | 0.87 | 2037-2038 | |
| 10 | Quintin Birss# | 0.88 | 2041-2054 | |
| 11 | Lloyd Mallandain# | 0.89 | 2054-2056 | |
| 11 | José Hernández# | 0.89 | 2047-2047 | |
| 11 | Juan Sánchez | 0.89 | 2027-2028 | |
| 14 | Yi-lin An | 0.90 | 2024-2030 | |
| 14 | Jackson Wear# | 0.90 | 2048-2051 | |
| 16 | Takafumi Ikeda | 0.95 | 2048-2050 | |
| 17 | Pat Rhodes# | 0.96 | 2056-2056 | |
| 18 | Jeffrey Flowers# | 0.98 | 2049-2053 | |
| 18 | Dewey McKim# | 0.98 | 2053-2055 | |
| 20 | Bartolo Chiaudani | 1.02 | 2028-2045 | |
| 21 | David Carpenter | 1.03 | 2045-2045 | |
| 22 | Bob Coleman | 1.04 | 2030-2030 | |
| 22 | Armando Jiménez | 1.04 | 2019-2024 | |
| 24 | Owen Mcintyre# | 1.07 | 2054-2054 | |
| 25 | Mike James | 1.11 | 2050-2052 | |
| 26 | António Coztes | 1.15 | 2045-2047 | |
| 27 | Alfonso Rodríguez# | 1.16 | 2056-2057 | |
| 28 | Micah Annlar | 1.18 | 2047-2050 | |
| 29 | Kwan-cheol Yi | 1.20 | 2045-2054 | |
| 30 | Rubén Pereira | 1.21 | 2025-2029 | |
| 31 | Niko Andric# | 1.22 | 2053-2056 | |
| 31 | Javier Aranda | 1.22 | 2026-2027 | |
| 31 | Héctor Delgado# | 1.22 | 2055-2058 | |
| 34 | José Rosas | 1.24 | 2024-2026 | |
| 35 | Roger Guth | 1.25 | 2026-2029 | |
| 35 | Rick Goulding | 1.25 | 2045-2052 | |
| 37 | Jorge Costa# | 1.27 | 2045-2049 | |
| 37 | Gilberto Morales | 1.27 | 2023-2028 | |
| 39 | Naruhiko Watanabe | 1.31 | 2045-2046 | |
| 40 | Jorge Casillas# | 1.36 | 2057-2057 | |
| 40 | Monte Evans# | 1.36 | 2050-2054 | |
| 42 | Jorge García# | 1.37 | 2052-2056 | |
| 43 | Tim Pierce | 1.41 | 2033-2035 | |
| 44 | Lucas Meech | 1.42 | 2027-2030 | |
| 45 | John Eilers | 1.45 | 2055-2056 | |
| 46 | Mohsin Janjua# | 1.47 | 2055-2057 | |
| 46 | Mei-shan Ngui | 1.47 | 2029-2030 | |
| 46 | Jack Collin | 1.47 | 2029-2030 | |
| 46 | Miguel Flores | 1.47 | 2027-2028 | |
| 50 | Fernando Márquez | 1.49 | 2029-2030 | |
| 51 | Pepe Elizarraraz | 1.54 | 2026-2030 | |
| 52 | Matt Mills | 1.61 | 2025-2038 | |
| 53 | Mu'tazz bin Akram# | 1.80 | 2045-2047 | |
| 54 | Xavier Silva | 1.88 | 2025-2028 | |
| 55 | Jed Parra | 1.95 | 2027-2031 |
