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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Wilson Vélez# | 3.41 | 2016-2022 | |
| 2 | Cisco Romero | 3.47 | 2019-2022 | |
| 3 | R.J. Anderson# | 3.55 | 2020-2027 | |
| 4 | Pedro Romero | 3.63 | 2020-2026 | |
| 5 | José Cabrera# | 3.68 | 2025-2028 | |
| 6 | Javier Roldán# | 3.70 | 2019-2023 | |
| 7 | Carlos Peret# | 3.77 | 2025-2028 | |
| 8 | Júlio Palácios | 3.78 | 2021-2026 | |
| 9 | Jorge Carrión# | 3.87 | 2022-2026 | |
| 10 | Louis McDowell# | 3.92 | 2015-2028 | |
| 11 | Scott Mildren# | 3.93 | 2024-2027 | |
| 12 | Shawn Arnold# | 4.13 | 2015-2022 | |
| 13 | King Fletcher# | 4.16 | 2020-2023 | |
| 14 | Mark Tucker# | 4.17 | 2017-2021 | |
| 15 | César González# | 4.25 | 2021-2023 | |
| 16 | Homer Shafer | 4.28 | 2015-2020 | |
| 17 | Clay Clark | 4.30 | 2015-2018 | |
| 18 | Rob Smith# | 4.35 | 2018-2027 | |
| 19 | Tom Hernández | 4.36 | 2016-2021 | |
| 20 | Jeff Moore | 4.41 | 2020-2022 | |
| 21 | António Fabián# | 4.42 | 2020-2028 | |
| 22 | Alonso Rodríguez | 4.51 | 2015-2019 | |
| 23 | William Bonner# | 4.54 | 2020-2027 | |
| 24 | David Davis# | 4.58 | 2019-2028 | |
| 25 | Alex Simmons | 4.64 | 2017-2024 | |
| 26 | Homer O'Lannigan | 4.73 | 2018-2021 | |
| 27 | Bob McGhee# | 4.80 | 2015-2028 | |
| 28 | Marc Graham | 4.93 | 2020-2022 | |
| 29 | Jesús López | 4.96 | 2016-2023 | |
| 30 | Anthony Hanover# | 5.00 | 2016-2020 | |
| 31 | Josh Gardner | 5.03 | 2017-2021 | |
| 32 | Mike Barrett | 5.04 | 2022-2027 | |
| 33 | Peter Hall# | 5.12 | 2024-2028 | |
| 34 | Travis Nelson# | 5.24 | 2024-2028 | |
| 35 | Eric Patnode | 5.25 | 2016-2025 | |
| 36 | Brad Wilson | 5.45 | 2015-2021 | |
| 37 | José Rodríguez | 5.86 | 2015-2019 |
