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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 | José Cabrera# | 3.68 | 2025-2028 | |
| 4 | Javier Roldán# | 3.70 | 2019-2023 | |
| 5 | Carlos Peret# | 3.77 | 2025-2028 | |
| 6 | Jorge Carrión# | 3.87 | 2022-2026 | |
| 7 | Louis McDowell# | 3.92 | 2015-2028 | |
| 8 | Scott Mildren# | 3.93 | 2024-2027 | |
| 9 | Shawn Arnold# | 4.13 | 2015-2022 | |
| 10 | Mark Tucker# | 4.17 | 2017-2021 | |
| 11 | César González# | 4.25 | 2021-2023 | |
| 12 | Homer Shafer | 4.28 | 2015-2020 | |
| 13 | Clay Clark | 4.30 | 2015-2018 | |
| 14 | Rob Smith# | 4.35 | 2018-2027 | |
| 15 | Tom Hernández | 4.36 | 2016-2021 | |
| 15 | Woo-suk Cho# | 4.36 | 2026-2029 | |
| 17 | Jeff Moore | 4.41 | 2020-2022 | |
| 18 | António Fabián# | 4.42 | 2020-2028 | |
| 19 | Alonso Rodríguez | 4.51 | 2015-2019 | |
| 20 | William Bonner# | 4.54 | 2020-2027 | |
| 21 | David Davis# | 4.57 | 2019-2029 | |
| 22 | Homer O'Lannigan | 4.73 | 2018-2021 | |
| 23 | Bob McGhee# | 4.80 | 2015-2028 | |
| 24 | Jesús López | 4.96 | 2016-2023 | |
| 25 | Anthony Hanover# | 5.00 | 2016-2020 | |
| 26 | Josh Gardner | 5.03 | 2017-2021 | |
| 27 | Mike Barrett | 5.04 | 2022-2027 | |
| 28 | Peter Hall# | 5.12 | 2024-2028 | |
| 29 | Eric Patnode | 5.25 | 2016-2025 | |
| 30 | Travis Nelson# | 5.29 | 2024-2029 | |
| 31 | Brad Wilson | 5.45 | 2015-2021 | |
| 32 | José Rodríguez | 5.86 | 2015-2019 |
