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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 | Bob Johnston# | 4.07 | 2027-2034 | |
| 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 | Michael Smith# | 4.28 | 2027-2031 | |
| 9 | Devayukta Tushar# | 4.29 | 2023-2032 | |
| 10 | Benny Hartley# | 4.32 | 2026-2034 | |
| 10 | Yeong-suk Kim# | 4.32 | 2021-2034 | |
| 12 | Sam Hatt | 4.33 | 2025-2030 | |
| 13 | Steve Dallas | 4.37 | 2014-2023 | |
| 14 | Dongdo-pa Chen# | 4.38 | 2025-2034 | |
| 15 | Nelson Hill | 4.40 | 2014-2025 | |
| 16 | Tim Rose | 4.41 | 2017-2030 | |
| 16 | J.R. Murphy | 4.41 | 2016-2025 | |
| 18 | Arturo González | 4.43 | 2013-2028 | |
| 18 | Harold Hayne# | 4.43 | 2023-2033 | |
| 20 | Anandam Ramanathan# | 4.45 | 2021-2034 | |
| 21 | Rubén Cabrera# | 4.47 | 2024-2028 | |
| 22 | Joe McLernon | 4.48 | 2016-2022 | |
| 23 | Joe Kenner | 4.52 | 2019-2033 | |
| 23 | José Díaz | 4.52 | 2016-2029 | |
| 25 | Francis Baker | 4.53 | 2013-2020 | |
| 26 | Yeijiro Ishihara# | 4.54 | 2022-2034 | |
| 26 | James Akehurst# | 4.54 | 2029-2034 | |
| 28 | John Martin | 4.55 | 2012-2021 | |
| 29 | Chris Baxter | 4.59 | 2019-2026 | |
| 29 | Orlando Marés | 4.59 | 2024-2030 | |
| 31 | Bob Brown# | 4.61 | 2027-2034 | |
| 31 | Michael Moyer# | 4.61 | 2022-2034 | |
| 33 | You-liang Rang# | 4.63 | 2023-2034 | |
| 33 | Miguel Bernal | 4.63 | 2023-2032 | |
| 35 | Juan Ramírez# | 4.67 | 2028-2034 | |
| 36 | Daniel Wilson# | 4.68 | 2023-2033 | |
| 37 | Andrew Johnson# | 4.71 | 2028-2034 | |
| 38 | Scott Roberts | 4.72 | 2019-2029 | |
| 39 | Yoritomo Ine | 4.74 | 2019-2025 | |
| 39 | Jacob Angle | 4.74 | 2017-2029 | |
| 39 | Cain Chatfield | 4.74 | 2020-2030 | |
| 42 | Bernardo Lara | 4.76 | 2016-2029 | |
| 42 | Ronald Lee# | 4.76 | 2025-2034 | |
| 44 | Aaron Dilnot | 4.78 | 2023-2030 | |
| 45 | Rick Childress# | 4.81 | 2026-2034 | |
| 46 | Kagehisa Saikawa# | 4.84 | 2022-2034 | |
| 47 | Sam Moore | 4.85 | 2021-2026 | |
| 48 | Joe Hurst# | 4.87 | 2025-2033 | |
| 49 | Eduardo Gamboa | 4.90 | 2014-2020 | |
| 49 | Jordan Johnstone | 4.90 | 2013-2020 | |
| 51 | Leonard Lee# | 4.91 | 2026-2034 | |
| 51 | Al Bates# | 4.91 | 2027-2034 | |
| 53 | Pedro Hernández | 4.93 | 2015-2020 | |
| 54 | Chuk-yan Bi | 4.94 | 2022-2033 | |
| 55 | Almas bin Su'ud# | 4.95 | 2027-2034 | |
| 56 | Buddy Wills | 4.98 | 2016-2024 | |
| 57 | Eric Walker | 5.01 | 2012-2021 | |
| 57 | Takeji Ogawa# | 5.01 | 2026-2034 | |
| 59 | Jon Morris | 5.03 | 2019-2028 | |
| 60 | Peter Barrett | 5.04 | 2012-2021 | |
| 60 | Edgardo Félix | 5.04 | 2015-2029 | |
| 60 | Goro Ota# | 5.04 | 2029-2034 | |
| 63 | Steve Lawrence | 5.05 | 2015-2022 | |
| 64 | Anthony McIntyre | 5.06 | 2022-2034 | |
| 65 | Paul Simpson | 5.07 | 2020-2029 | |
| 66 | Phil Phillips# | 5.11 | 2027-2034 | |
| 67 | Wayne Penfield | 5.12 | 2020-2029 | |
| 68 | Guillermo Miranda | 5.13 | 2016-2025 | |
| 69 | Daniel Bonnin | 5.15 | 2019-2028 | |
| 70 | Bob Alexander# | 5.17 | 2024-2032 | |
| 70 | Evan Taylor | 5.17 | 2017-2022 | |
| 70 | Scott Prince | 5.17 | 2013-2020 | |
| 73 | Kazuhiro Kouno | 5.22 | 2020-2027 | |
| 74 | Fred Watson | 5.23 | 2018-2030 | |
| 75 | Trey Robinson# | 5.26 | 2024-2034 | |
| 76 | Gerardo Estrada# | 5.27 | 2023-2034 | |
| 77 | Tommy Bartlett | 5.30 | 2021-2029 | |
| 77 | Chris Riddle# | 5.30 | 2022-2034 | |
| 79 | Alberto Rivera# | 5.34 | 2022-2033 | |
| 80 | Jeff Olsen | 5.35 | 2012-2020 | |
| 80 | Terumoto Yamamoto | 5.35 | 2019-2028 | |
| 80 | Carlos León# | 5.35 | 2022-2033 | |
| 80 | Steve Johnston | 5.35 | 2016-2023 | |
| 84 | Bi`nh Trieu# | 5.38 | 2028-2034 | |
| 84 | Robert Cook# | 5.38 | 2021-2034 | |
| 86 | Esteban Martínez | 5.40 | 2017-2029 | |
| 87 | Félix Barrera | 5.41 | 2019-2027 | |
| 88 | Paulus van Zundert | 5.42 | 2023-2028 | |
| 89 | Michael Walsh# | 5.44 | 2025-2034 | |
| 90 | Senzo Nakashima | 5.45 | 2024-2030 | |
| 91 | Odoardo Bairros | 5.47 | 2015-2027 | |
| 92 | Kyoji Mizutani# | 5.48 | 2023-2032 | |
| 93 | Guo-quiang Zhào# | 5.49 | 2025-2034 | |
| 94 | Johnny Vallance | 5.52 | 2019-2023 | |
| 94 | Graham Hardingham# | 5.52 | 2023-2031 | |
| 96 | Mark Stevenson | 5.58 | 2019-2028 | |
| 97 | Fabián Torres | 5.60 | 2016-2022 | |
| 98 | George Bedford | 5.61 | 2021-2029 | |
| 99 | Luis Miguel Hiracheta | 5.64 | 2012-2024 | |
| 99 | Tony Green | 5.64 | 2016-2021 |
