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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | R.J. Anderson | 3.55 | 2020-2027 | |
| 2 | Pedro Romero | 3.63 | 2020-2026 | |
| 3 | Louis McDowell | 4.02 | 2015-2030 | |
| 4 | Salvador López# | 4.27 | 2029-2034 | |
| 4 | Steve Bryan | 4.27 | 2019-2031 | |
| 6 | Jeff Moore | 4.41 | 2020-2022 | |
| 6 | Woo-suk Cho# | 4.41 | 2026-2032 | |
| 8 | António Fabián | 4.42 | 2020-2028 | |
| 9 | Júlio Vázquez# | 4.54 | 2027-2032 | |
| 10 | David Davis# | 4.65 | 2019-2030 | |
| 11 | Homer O'Lannigan | 4.73 | 2018-2021 | |
| 12 | Bob McGhee | 4.80 | 2015-2028 | |
| 13 | Mike Barrett | 5.04 | 2022-2027 | |
| 14 | Travis Nelson | 5.29 | 2024-2029 |
