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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 | Scott Mildren# | 3.93 | 2024-2027 | |
| 4 | Louis McDowell | 4.02 | 2015-2030 | |
| 5 | Shawn Arnold | 4.13 | 2015-2022 | |
| 6 | Mark Tucker | 4.17 | 2017-2021 | |
| 7 | Steve Bryan | 4.27 | 2019-2031 | |
| 8 | Rob Smith | 4.35 | 2018-2027 | |
| 9 | Jeff Moore | 4.41 | 2020-2022 | |
| 9 | Woo-suk Cho# | 4.41 | 2026-2032 | |
| 11 | António Fabián# | 4.42 | 2020-2028 | |
| 12 | Júlio Vázquez# | 4.54 | 2027-2032 | |
| 13 | David Davis# | 4.65 | 2019-2030 | |
| 14 | Homer O'Lannigan | 4.73 | 2018-2021 | |
| 15 | Bob McGhee | 4.80 | 2015-2028 | |
| 16 | Jesús López | 4.96 | 2016-2023 | |
| 17 | Josh Gardner | 5.03 | 2017-2021 | |
| 18 | Mike Barrett | 5.04 | 2022-2027 | |
| 19 | Eric Patnode | 5.25 | 2016-2025 | |
| 20 | Travis Nelson | 5.29 | 2024-2029 |
