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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Alejandro Cruz | 0.494 | 2051-2052 | |
| 2 | Félix Jiménez | 0.831 | 2038-2040 | |
| 3 | Yi-lin An | 1.038 | 2024-2030 | |
| 4 | Manuel Ruíz | 1.059 | 2037-2048 | |
| 5 | Nick Rivers# | 1.218 | 2050-2053 | |
| 6 | Bill Keefe# | 1.239 | 2045-2046 | |
| 7 | Jarred Perkins | 1.452 | 2037-2038 | |
| 8 | Bob Coleman | 1.766 | 2030-2030 | |
| 9 | Rubén Pereira | 1.815 | 2025-2029 | |
| 10 | David Carpenter | 1.969 | 2045-2045 | |
| 11 | José Hernández# | 2.000 | 2047-2047 | |
| 12 | Owen Mcintyre# | 2.077 | 2054-2054 | |
| 12 | Juan Sánchez | 2.077 | 2027-2028 | |
| 14 | Jorge Costa# | 2.432 | 2045-2049 | |
| 15 | Héctor Delgado# | 2.480 | 2055-2058 | |
| 15 | Lloyd Mallandain# | 2.480 | 2054-2056 | |
| 17 | Tim Pierce | 2.531 | 2033-2035 | |
| 18 | Takeo Aoki | 2.558 | 2033-2035 | |
| 19 | Kwan-cheol Yi | 2.571 | 2045-2054 | |
| 20 | Juan Cruz# | 2.613 | 2045-2047 | |
| 20 | Alfonso Rodríguez# | 2.613 | 2056-2057 | |
| 20 | Aras Yilmanz | 2.613 | 2045-2050 | |
| 23 | Takafumi Ikeda | 2.662 | 2048-2050 | |
| 24 | António Coztes | 2.700 | 2045-2047 | |
| 25 | Pat Rhodes# | 2.784 | 2056-2056 | |
| 26 | Quintin Birss# | 2.888 | 2041-2054 | |
| 27 | Armando Jiménez | 2.935 | 2019-2024 | |
| 28 | Bartolo Chiaudani | 2.967 | 2028-2045 | |
| 29 | Monte Evans# | 3.062 | 2050-2054 | |
| 30 | Jeffrey Flowers# | 3.184 | 2049-2053 | |
| 31 | Roger Guth | 3.185 | 2026-2029 | |
| 32 | Dewey McKim# | 3.228 | 2053-2055 | |
| 33 | Jackson Wear# | 3.240 | 2048-2051 | |
| 34 | Naruhiko Watanabe | 3.375 | 2045-2046 | |
| 35 | Gilberto Morales | 3.432 | 2023-2028 | |
| 36 | Niko Andric# | 3.475 | 2053-2056 | |
| 37 | Lucas Meech | 3.560 | 2027-2030 | |
| 38 | Javier Aranda | 3.611 | 2026-2027 | |
| 39 | Mike James | 3.630 | 2050-2052 | |
| 40 | Jorge García# | 3.734 | 2052-2056 | |
| 41 | José Rosas | 3.857 | 2024-2026 | |
| 42 | Micah Annlar | 3.923 | 2047-2050 | |
| 43 | Rick Goulding | 4.091 | 2045-2052 | |
| 44 | Mei-shan Ngui | 4.235 | 2029-2030 | |
| 45 | Mohsin Janjua# | 4.320 | 2055-2057 | |
| 46 | Jack Collin | 4.339 | 2029-2030 | |
| 47 | Matt Mills | 4.418 | 2025-2038 | |
| 48 | Jorge Casillas# | 4.454 | 2057-2057 | |
| 49 | Fernando Márquez | 4.531 | 2029-2030 | |
| 50 | John Eilers | 4.832 | 2055-2056 | |
| 51 | Miguel Flores | 5.545 | 2027-2028 | |
| 52 | Mu'tazz bin Akram# | 6.480 | 2045-2047 | |
| 53 | Pepe Elizarraraz | 6.568 | 2026-2030 | |
| 54 | Xavier Silva | 7.181 | 2025-2028 | |
| 55 | Jed Parra | 7.579 | 2027-2031 |
