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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Ryan Feierabend | 3.907 | 2007-2014 | |
| 2 | Nathan Eovaldi# | 4.085 | 2013-2015 | |
| 3 | Clayton Richard | 4.346 | 2013-2017 | |
| 4 | Scott Diamond | 4.403 | 2013-2021 | |
| 5 | Jose De Leon# | 4.581 | 2017-2025 | |
| 6 | Brent Honeywell Jr.# | 4.614 | 2018-2020 | |
| 7 | Lucas Harrell | 4.707 | 2013-2018 | |
| 8 | Allen Webster | 4.877 | 2013-2021 | |
| 9 | Braden Shipley | 4.913 | 2017-2024 | |
| 10 | Luke Weaver# | 4.949 | 2017-2024 | |
| 11 | Brad Mills | 4.979 | 2013-2017 | |
| 12 | Felix Doubront | 4.986 | 2016-2019 | |
| 13 | Mike Wright | 5.258 | 2015-2024 | |
| 14 | Mitch White# | 5.349 | 2019-2023 | |
| 15 | Humberto Mejia# | 5.403 | 2022-2025 | |
| 16 | Brandon Cumpton | 5.407 | 2014-2019 | |
| 17 | Brett Kennedy# | 5.556 | 2019-2023 | |
| 18 | Burch Smith | 5.562 | 2016-2022 | |
| 19 | Kolby Allard# | 5.594 | 2018-2021 | |
| 20 | Ross Detwiler | 5.656 | 2014-2024 | |
| 21 | Rob Scahill | 5.704 | 2013-2019 | |
| 22 | Brooks Raley# | 5.757 | 2014-2024 | |
| 23 | Brandon Leibrandt# | 5.854 | 2018-2025 | |
| 24 | Paolo Espino# | 5.972 | 2016-2025 | |
| 25 | Dillon Overton | 6.510 | 2016-2022 |
