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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | César Rosado# | 1.81 | 2021-2023 | |
| 2 | Pleun Davidse# | 1.95 | 2027-2029 | |
| 3 | Alejandro García# | 1.98 | 2026-2029 | |
| 4 | John Castle# | 2.10 | 2027-2029 | |
| 5 | Juan Reyes# | 2.13 | 2020-2021 | |
| 6 | José Rico# | 2.15 | 2021-2023 | |
| 7 | Alfonso Santa Maria# | 2.22 | 2023-2026 | |
| 8 | Jesús Garces# | 2.31 | 2026-2028 | |
| 9 | Brian Fixel# | 2.33 | 2023-2025 | |
| 10 | Carlos Domínguez# | 2.38 | 2021-2024 | |
| 11 | Osvaldo Garibe# | 2.39 | 2026-2027 | |
| 12 | Stanley Eldrige# | 2.43 | 2025-2027 | |
| 13 | Poto Scacceri# | 2.44 | 2024-2027 | |
| 14 | Shotaro Sugahara# | 2.45 | 2024-2027 | |
| 15 | Dominic Parker# | 2.50 | 2020-2021 | |
| 16 | Manny Castro# | 2.51 | 2026-2028 | |
| 16 | Quentin Bowers# | 2.51 | 2023-2025 | |
| 18 | Jesús Guerra# | 2.52 | 2023-2025 | |
| 19 | Héctor Aguilar# | 2.54 | 2026-2028 | |
| 19 | Raneem Zogby# | 2.54 | 2026-2028 | |
| 21 | John Riggleman# | 2.55 | 2023-2024 | |
| 21 | Phil Miller# | 2.55 | 2021-2025 | |
| 21 | Fred Wilson | 2.55 | 2022-2023 | |
| 24 | Blaine Stottlar# | 2.57 | 2027-2028 | |
| 25 | Nelson Cuevas# | 2.58 | 2026-2028 | |
| 25 | Rafael Rivera# | 2.58 | 2022-2023 | |
| 27 | Pat Thompson | 2.65 | 2020-2022 | |
| 28 | Manny Pérez# | 2.73 | 2020-2021 | |
| 29 | Billy Grange# | 2.75 | 2024-2026 | |
| 30 | José Guardado | 2.79 | 2021-2022 | |
| 30 | Geoff Stackhouse# | 2.79 | 2025-2029 | |
| 32 | Kostas Antetokounmpo# | 2.81 | 2026-2027 | |
| 33 | Kidlat Dakila# | 2.83 | 2027-2029 | |
| 34 | Magnus Scheving# | 2.86 | 2023-2026 | |
| 35 | Reynaldo Sánchez# | 2.94 | 2020-2023 | |
| 36 | Marv Bradford# | 2.95 | 2021-2024 | |
| 37 | Phil Hanson# | 2.96 | 2020-2023 | |
| 37 | Kagetoki Matsubara# | 2.96 | 2027-2028 | |
| 37 | José Ortíz# | 2.96 | 2023-2024 | |
| 40 | Rafael Peralta# | 2.98 | 2021-2025 | |
| 41 | Lincoln Spooner# | 3.01 | 2026-2028 | |
| 42 | Nicolas Roche# | 3.02 | 2027-2029 | |
| 43 | Pedro Tavárez# | 3.05 | 2024-2027 | |
| 43 | Esteban Nevárez | 3.05 | 2020-2025 | |
| 43 | António Rodríguez# | 3.05 | 2023-2025 | |
| 46 | Masami Kogawa# | 3.06 | 2026-2027 | |
| 47 | Joel Farrell# | 3.12 | 2026-2027 | |
| 48 | Tobías Pérez# | 3.18 | 2020-2021 | |
| 48 | Jeff Schneider# | 3.18 | 2020-2021 | |
| 50 | James Dockery# | 3.20 | 2022-2024 | |
| 51 | Octávio Ríos# | 3.24 | 2020-2022 | |
| 52 | Finn Wuilink# | 3.28 | 2020-2022 | |
| 53 | Gabriel Herrera# | 3.36 | 2022-2025 | |
| 54 | Yoshi Minamoto# | 3.37 | 2027-2029 | |
| 54 | Will Hoffman# | 3.37 | 2026-2028 | |
| 56 | Javier Mena# | 3.38 | 2024-2025 | |
| 57 | Dave Mason | 3.40 | 2020-2022 | |
| 58 | Roberto Covas# | 3.44 | 2022-2024 | |
| 59 | Bernardino Neagle# | 3.48 | 2020-2023 | |
| 59 | António Fabián# | 3.48 | 2020-2022 | |
| 59 | Behar Jusufi# | 3.48 | 2026-2029 | |
| 62 | Mike McKay# | 3.50 | 2026-2029 | |
| 62 | Rodney Spurr# | 3.50 | 2027-2028 | |
| 64 | Garrett Schaper# | 3.68 | 2025-2028 | |
| 65 | Edmund Blackadder# | 3.77 | 2026-2029 | |
| 66 | Juan Ordóñez# | 3.87 | 2024-2026 | |
| 67 | Mike Foltynewicz# | 3.95 | 2024-2025 | |
| 68 | Enea Dini# | 4.07 | 2020-2024 | |
| 69 | Curt Walker# | 4.28 | 2021-2023 | |
| 70 | Awad Mahmudnizhad# | 4.64 | 2025-2029 |
