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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Alejandro Lafrosia# | 3.76 | 2025-2031 | |
| 2 | Benny Hartley# | 4.02 | 2026-2032 | |
| 3 | Pablo Cuevas | 4.17 | 2015-2029 | |
| 3 | Scott Gorman | 4.17 | 2012-2022 | |
| 5 | John Slater | 4.22 | 2018-2027 | |
| 6 | Robert Hood | 4.23 | 2015-2023 | |
| 7 | Jeffery Francis | 4.25 | 2016-2027 | |
| 8 | Yeong-suk Kim# | 4.26 | 2021-2032 | |
| 9 | Michael Smith# | 4.28 | 2027-2031 | |
| 10 | Devayukta Tushar# | 4.29 | 2023-2032 | |
| 11 | Sam Hatt | 4.33 | 2025-2030 | |
| 12 | Steve Dallas | 4.37 | 2014-2023 | |
| 13 | Nelson Hill | 4.40 | 2014-2025 | |
| 14 | Tim Rose | 4.41 | 2017-2030 | |
| 14 | J.R. Murphy | 4.41 | 2016-2025 | |
| 16 | Arturo González | 4.43 | 2013-2028 | |
| 17 | Joe Kenner# | 4.44 | 2019-2032 | |
| 18 | Rubén Cabrera# | 4.47 | 2024-2028 | |
| 19 | Joe McLernon | 4.48 | 2016-2022 | |
| 20 | José Díaz# | 4.52 | 2016-2029 | |
| 21 | Francis Baker | 4.53 | 2013-2020 | |
| 22 | John Martin | 4.55 | 2012-2021 | |
| 23 | Daniel Wilson# | 4.56 | 2023-2032 | |
| 24 | Chris Baxter | 4.59 | 2019-2026 | |
| 24 | Orlando Marés | 4.59 | 2024-2030 | |
| 26 | Miguel Bernal# | 4.63 | 2023-2032 | |
| 27 | You-liang Rang# | 4.65 | 2023-2032 | |
| 28 | Scott Roberts | 4.72 | 2019-2029 | |
| 29 | Yoritomo Ine | 4.74 | 2019-2025 | |
| 29 | Jacob Angle | 4.74 | 2017-2029 | |
| 29 | Cain Chatfield | 4.74 | 2020-2030 | |
| 32 | Rick Childress# | 4.76 | 2026-2032 | |
| 32 | Bernardo Lara | 4.76 | 2016-2029 | |
| 34 | Aaron Dilnot | 4.78 | 2023-2030 | |
| 35 | Leonard Lee# | 4.80 | 2026-2032 | |
| 36 | Sam Moore | 4.85 | 2021-2026 | |
| 37 | Joe Hurst# | 4.86 | 2025-2032 | |
| 38 | Chuk-yan Bi# | 4.89 | 2022-2032 | |
| 39 | Eduardo Gamboa | 4.90 | 2014-2020 | |
| 39 | Jordan Johnstone | 4.90 | 2013-2020 | |
| 41 | Pedro Hernández | 4.93 | 2015-2020 | |
| 42 | Buddy Wills | 4.98 | 2016-2024 | |
| 43 | Kagehisa Saikawa# | 4.99 | 2022-2031 | |
| 44 | Gerardo Estrada# | 5.00 | 2023-2032 | |
| 45 | Eric Walker | 5.01 | 2012-2021 | |
| 45 | Takeji Ogawa# | 5.01 | 2026-2032 | |
| 47 | Jon Morris | 5.03 | 2019-2028 | |
| 48 | Peter Barrett | 5.04 | 2012-2021 | |
| 48 | Edgardo Félix | 5.04 | 2015-2029 | |
| 50 | Steve Lawrence | 5.05 | 2015-2022 | |
| 50 | Almas bin Su'ud# | 5.05 | 2027-2032 | |
| 52 | Paul Simpson | 5.07 | 2020-2029 | |
| 53 | Wayne Penfield | 5.12 | 2020-2029 | |
| 54 | Guillermo Miranda | 5.13 | 2016-2025 | |
| 55 | Trey Robinson# | 5.14 | 2024-2032 | |
| 56 | Daniel Bonnin | 5.15 | 2019-2028 | |
| 57 | Bob Alexander# | 5.17 | 2024-2032 | |
| 57 | Evan Taylor | 5.17 | 2017-2022 | |
| 57 | Scott Prince | 5.17 | 2013-2020 | |
| 60 | Anthony McIntyre# | 5.19 | 2022-2032 | |
| 61 | Kazuhiro Kouno | 5.22 | 2020-2027 | |
| 62 | Fred Watson | 5.23 | 2018-2030 | |
| 63 | Carlos León# | 5.29 | 2022-2031 | |
| 64 | Tommy Bartlett | 5.30 | 2021-2029 | |
| 65 | Alberto Rivera# | 5.33 | 2022-2032 | |
| 66 | Jeff Olsen | 5.35 | 2012-2020 | |
| 66 | Terumoto Yamamoto | 5.35 | 2019-2028 | |
| 66 | Steve Johnston | 5.35 | 2016-2023 | |
| 69 | Esteban Martínez | 5.40 | 2017-2029 | |
| 70 | Félix Barrera | 5.41 | 2019-2027 | |
| 71 | Paulus van Zundert | 5.42 | 2023-2028 | |
| 72 | Senzo Nakashima | 5.45 | 2024-2030 | |
| 73 | Odoardo Bairros | 5.47 | 2015-2027 | |
| 74 | Kyoji Mizutani# | 5.48 | 2023-2032 | |
| 75 | Johnny Vallance | 5.52 | 2019-2023 | |
| 75 | Graham Hardingham# | 5.52 | 2023-2031 | |
| 75 | Michael Walsh# | 5.52 | 2025-2032 | |
| 78 | Mark Stevenson | 5.58 | 2019-2028 | |
| 79 | Fabián Torres | 5.60 | 2016-2022 | |
| 80 | Robert Cook# | 5.61 | 2021-2032 | |
| 80 | George Bedford | 5.61 | 2021-2029 | |
| 82 | Luis Miguel Hiracheta | 5.64 | 2012-2024 | |
| 82 | Tony Green | 5.64 | 2016-2021 | |
| 84 | Bruce Wall | 5.65 | 2019-2024 | |
| 85 | Jeffrey Allison | 5.72 | 2020-2027 | |
| 86 | Ernie Peters | 5.73 | 2012-2020 | |
| 87 | Masuhiro Kondo | 5.74 | 2015-2022 | |
| 88 | Denny Goodwin# | 5.86 | 2025-2032 | |
| 89 | Rino Nitisastro# | 5.90 | 2025-2032 | |
| 90 | Frank Cronshaw# | 5.97 | 2021-2031 | |
| 91 | Travis Smith# | 6.04 | 2024-2032 | |
| 92 | Jaime Hernández | 6.05 | 2013-2022 |
