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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Robert Cook# | 1.14 | 2021-2034 | |
| 2 | Takeji Ogawa# | 1.98 | 2026-2034 | |
| 3 | Manuel Sánchez# | 2.03 | 2024-2034 | |
| 4 | Joe Ward | 2.79 | 2013-2022 | |
| 5 | Wayne Penfield | 3.08 | 2020-2029 | |
| 6 | Adharma Sughavanam# | 3.27 | 2024-2034 | |
| 7 | John Stroud | 3.38 | 2021-2030 | |
| 8 | Willi Kehr# | 3.69 | 2030-2032 | |
| 9 | Paul Durden | 3.73 | 2012-2017 | |
| 10 | Lester Bisdu# | 3.89 | 2030-2032 | |
| 11 | Kagehisa Saikawa# | 4.05 | 2022-2034 | |
| 11 | Vincent Vickers# | 4.05 | 2025-2034 | |
| 13 | Rick Childress# | 4.25 | 2026-2034 | |
| 14 | Yeong-suk Kim# | 4.46 | 2021-2034 | |
| 15 | Carlos León# | 4.50 | 2022-2033 | |
| 16 | Matsuyo Koda# | 4.95 | 2031-2034 | |
| 17 | Kichibei Ozawa | 4.98 | 2026-2030 | |
| 18 | Yoshiaga Rin# | 5.04 | 2024-2032 | |
| 19 | Mike Sprake | 5.63 | 2020-2027 | |
| 20 | Alberto Ramírez | 7.39 | 2018-2026 | |
| 21 | Joe Hurst# | 9.26 | 2025-2033 |
