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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ted Mills | 0.409 | 2012 | |
| 2 | John Cannon | 0.443 | 2017 | |
| 3 | Ricardo Castros# | 0.551 | 2025 | |
| 3 | Nicolas Dupuis# | 0.551 | 2031 | |
| 5 | Ben Crabb# | 0.947 | 2031 | |
| 6 | Don Wheeler# | 0.982 | 2032 | |
| 7 | Mike Taylor# | 1.019 | 2026 | |
| 8 | Charlie Bennett# | 1.080 | 2028 | |
| 9 | José Barrachina# | 1.102 | 2030 | |
| 10 | Jorge Rivera# | 1.200 | 2032 | |
| 11 | Garland Akers | 1.534 | 2022 | |
| 12 | Felipe Arreola# | 1.565 | 2028 | |
| 13 | Juan Pérez# | 1.653 | 2030 | |
| 14 | Tony Saldana# | 1.723 | 2033 | |
| 15 | Jorge Vásquez | 1.761 | 2018 | |
| 16 | Oscar Mata# | 1.824 | 2033 | |
| 17 | Saiyid Mashwanis# | 2.038 | 2025 | |
| 18 | Ruberto Laranjeira | 2.051 | 2020 | |
| 19 | Ramu Pavi | 2.104 | 2018 | |
| 20 | Willi Kehr# | 2.118 | 2027 | |
| 21 | Benny Hartley# | 2.139 | 2022 | |
| 22 | Robert Osborne | 2.160 | 2019 | |
| 23 | Jason Atkinson | 2.411 | 2022 | |
| 24 | Don Wheeler# | 2.500 | 2031 | |
| 24 | Jason Duncan# | 2.500 | 2025 | |
| 26 | Willi Kehr# | 2.613 | 2028 | |
| 27 | Matsuyo Koda# | 2.625 | 2029 | |
| 28 | Felipe Moreno | 2.647 | 2025 | |
| 29 | Luis Olvera | 2.670 | 2018 | |
| 30 | Julian Fanner# | 2.700 | 2026 | |
| 31 | Juan Martínez# | 2.821 | 2029 | |
| 32 | Clifford Ferguson | 2.908 | 2017 | |
| 33 | Gabresilassie Cherono# | 2.935 | 2019 | |
| 34 | Tim Conway | 2.945 | 2021 | |
| 35 | Yoshiaga Rin# | 3.000 | 2023 | |
| 35 | Marcos Marino# | 3.000 | 2024 | |
| 37 | Kunio Otsuka# | 3.042 | 2033 | |
| 38 | Nick Nielsen | 3.176 | 2021 | |
| 39 | Pat McConnell# | 3.306 | 2026 | |
| 40 | António Espinoza | 3.316 | 2026 | |
| 41 | Xavier Gordon | 3.375 | 2017 | |
| 42 | José Gómez# | 3.500 | 2032 | |
| 43 | Adam Andersen# | 3.522 | 2033 | |
| 44 | Lúcio Barrón# | 3.600 | 2032 | |
| 45 | Hyun-tae Hwan# | 3.706 | 2027 | |
| 46 | Daryl Harrison# | 3.789 | 2023 | |
| 47 | Bobby Mannix# | 3.857 | 2028 | |
| 47 | Alex Barnaby | 3.857 | 2022 | |
| 49 | Juan Martínez# | 3.919 | 2028 | |
| 50 | Maurice Hesmondhalgh | 4.000 | 2021 | |
| 51 | Tamasaburo Kato# | 4.050 | 2027 | |
| 52 | Graham Bennett# | 4.190 | 2033 | |
| 53 | Jeff Stephens# | 4.286 | 2032 | |
| 54 | George Clay | 4.585 | 2020 | |
| 55 | Arnold Woods | 4.944 | 2017 | |
| 56 | Jake Robinson | 5.121 | 2018 | |
| 57 | Arata Shimizu# | 5.192 | 2027 | |
| 58 | Barrett Lamb# | 5.304 | 2031 | |
| 59 | He-ping Wang# | 5.400 | 2021 | |
| 60 | Hidetada Abe# | 5.586 | 2024 | |
| 61 | Chance Richards | 5.754 | 2020 | |
| 62 | Ammar Isma'il | 6.000 | 2018 | |
| 63 | Ánibal Altichioro# | 6.113 | 2024 | |
| 64 | Mauro Rodríguez# | 6.600 | 2031 | |
| 65 | Luis Olvera | 6.632 | 2019 | |
| 66 | Shafeeq bin Nooh | 6.652 | 2021 | |
| 67 | Domingo Moreno# | 7.286 | 2021 | |
| 68 | Seung-kab Ko | 9.978 | 2017 | |
| 69 | Orlando Días# | 10.200 | 2021 |
