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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 | John Castle# | 2.10 | 2027-2029 | |
| 4 | José Rico# | 2.15 | 2021-2023 | |
| 5 | Alfonso Santa Maria# | 2.22 | 2023-2026 | |
| 6 | Jesús Garces# | 2.31 | 2026-2028 | |
| 7 | Brian Fixel# | 2.33 | 2023-2025 | |
| 8 | Alejandro García# | 2.34 | 2026-2030 | |
| 9 | Carlos Domínguez# | 2.38 | 2021-2024 | |
| 10 | Stanley Eldrige# | 2.43 | 2025-2027 | |
| 11 | Poto Scacceri# | 2.44 | 2024-2027 | |
| 12 | Shotaro Sugahara# | 2.45 | 2024-2027 | |
| 13 | Raneem Zogby# | 2.48 | 2026-2030 | |
| 14 | Dominic Parker# | 2.50 | 2020-2021 | |
| 15 | Manny Castro# | 2.51 | 2026-2028 | |
| 15 | Quentin Bowers# | 2.51 | 2023-2025 | |
| 17 | Jesús Guerra# | 2.52 | 2023-2025 | |
| 18 | Héctor Aguilar# | 2.54 | 2026-2028 | |
| 19 | Phil Miller# | 2.55 | 2021-2025 | |
| 20 | Blaine Stottlar# | 2.57 | 2027-2028 | |
| 21 | Nelson Cuevas# | 2.58 | 2026-2028 | |
| 21 | Rafael Rivera# | 2.58 | 2022-2023 | |
| 23 | Pat Thompson | 2.65 | 2020-2022 | |
| 24 | Nicolas Roche# | 2.70 | 2027-2030 | |
| 25 | Manny Pérez# | 2.73 | 2020-2021 | |
| 26 | Billy Grange# | 2.75 | 2024-2026 | |
| 27 | José Guardado | 2.79 | 2021-2022 | |
| 27 | Geoff Stackhouse# | 2.79 | 2025-2029 | |
| 29 | Kostas Antetokounmpo# | 2.81 | 2026-2027 | |
| 30 | Magnus Scheving# | 2.86 | 2023-2026 | |
| 31 | Reynaldo Sánchez# | 2.94 | 2020-2023 | |
| 32 | Marv Bradford# | 2.95 | 2021-2024 | |
| 33 | Phil Hanson# | 2.96 | 2020-2023 | |
| 33 | Kagetoki Matsubara# | 2.96 | 2027-2028 | |
| 33 | José Ortíz# | 2.96 | 2023-2024 | |
| 36 | Rafael Peralta# | 2.98 | 2021-2025 | |
| 37 | Lincoln Spooner# | 3.01 | 2026-2028 | |
| 38 | Pedro Tavárez# | 3.05 | 2024-2027 | |
| 38 | António Rodríguez# | 3.05 | 2023-2025 | |
| 40 | Tobías Pérez# | 3.18 | 2020-2021 | |
| 41 | Yoshi Minamoto# | 3.24 | 2027-2030 | |
| 41 | Octávio Ríos# | 3.24 | 2020-2022 | |
| 43 | Edmund Blackadder# | 3.27 | 2026-2030 | |
| 44 | Finn Wuilink# | 3.28 | 2020-2022 | |
| 45 | Gabriel Herrera# | 3.36 | 2022-2025 | |
| 45 | Barry Mullen# | 3.36 | 2028-2030 | |
| 47 | Will Hoffman# | 3.37 | 2026-2028 | |
| 48 | Hengkie Iriawan# | 3.39 | 2028-2030 | |
| 49 | Dave Mason | 3.40 | 2020-2022 | |
| 50 | Bernardino Neagle# | 3.48 | 2020-2023 | |
| 50 | Behar Jusufi# | 3.48 | 2026-2029 | |
| 52 | Mike McKay# | 3.50 | 2026-2029 | |
| 53 | Garrett Schaper# | 3.64 | 2025-2030 | |
| 54 | Juan Ordóñez# | 3.87 | 2024-2026 | |
| 55 | Enea Dini# | 4.07 | 2020-2024 | |
| 56 | Curt Walker# | 4.28 | 2021-2023 | |
| 57 | Awad Mahmudnizhad# | 4.57 | 2025-2030 |
