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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Alberto Márquez | 3.97 | 2026-2032 | |
| 2 | Bang-xao Lam | 3.98 | 2012-2022 | |
| 3 | Scott Conklin | 4.17 | 2016-2022 | |
| 4 | Jim Sheppard | 4.18 | 2019-2034 | |
| 5 | Norberto Méndez | 4.28 | 2012-2026 | |
| 6 | Troy Hensley | 4.47 | 2011-2020 | |
| 7 | Kazuo Mochizuki | 4.51 | 2024-2035 | |
| 8 | Rafael Santillanenz | 4.60 | 2010-2021 | |
| 8 | Mike Stabler | 4.60 | 2021-2032 | |
| 10 | Adrián León | 4.61 | 2019-2030 | |
| 11 | Horace Jacobs# | 4.72 | 2028-2037 | |
| 12 | John Harris | 4.79 | 2013-2020 | |
| 13 | José Fernández# | 4.81 | 2030-2038 | |
| 14 | Martín Reyes | 4.82 | 2020-2030 | |
| 15 | Eric Wilder | 4.85 | 2012-2021 | |
| 16 | Scott Dyer | 4.87 | 2007-2020 | |
| 17 | Wendell O'Rorke | 4.96 | 2011-2019 | |
| 18 | Roberto Matoza | 4.98 | 2021-2031 | |
| 19 | Luis Pregaso | 4.99 | 2007-2019 | |
| 20 | Sloan Otto | 5.01 | 2015-2024 | |
| 21 | António Galindo | 5.02 | 2019-2030 | |
| 21 | Mitsunari Jouda | 5.02 | 2017-2031 | |
| 23 | Javier Toledo | 5.03 | 2024-2031 | |
| 24 | Gerald Williams | 5.05 | 2007-2018 | |
| 25 | Arturo Martínez | 5.06 | 2020-2031 | |
| 26 | Jon Vaughn# | 5.07 | 2029-2038 | |
| 27 | Bryan Avery | 5.10 | 2011-2024 | |
| 28 | Gabriel Morales | 5.14 | 2010-2020 | |
| 29 | Dema Mitenkov | 5.21 | 2026-2031 | |
| 30 | Silvio Fiermonte# | 5.32 | 2030-2038 | |
| 31 | Aluizio Subgua | 5.34 | 2012-2023 | |
| 32 | Pepe Caro | 5.46 | 2016-2026 | |
| 33 | Sergio Chávez# | 5.58 | 2029-2036 | |
| 34 | Ron Chapman | 5.63 | 2028-2035 | |
| 35 | Kelly Haynes | 5.75 | 2008-2019 | |
| 36 | Hokusai Nakashima | 5.89 | 2019-2031 | |
| 37 | Honorato Mota | 6.00 | 2021-2035 | |
| 38 | Israel Aguilar | 6.26 | 2012-2022 | |
| 39 | António Benítez | 6.30 | 2017-2029 | |
| 40 | Manny Maldonado | 6.37 | 2015-2027 | |
| 41 | Jeffery Barker | 6.41 | 2007-2016 | |
| 42 | Bill Peterson | 7.26 | 2027-2035 | |
| 43 | José García | 7.45 | 2025-2032 |
