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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Brian Flynn | 0.982 | 2014 | |
| 2 | Jordan Lyles# | 1.528 | 2017 | |
| 3 | Jack Patterson | 1.588 | 2020 | |
| 4 | Tyler Alexander# | 1.770 | 2024 | |
| 5 | Rubby de la Rosa# | 1.831 | 2014 | |
| 6 | Brett Cecil | 1.952 | 2013 | |
| 7 | David Peterson# | 2.204 | 2020 | |
| 8 | Kwang-hyun Kim# | 2.382 | 2025 | |
| 9 | Luke Weaver# | 2.455 | 2021 | |
| 10 | Corbin Martin# | 2.647 | 2019 | |
| 11 | Austen Williams | 2.793 | 2020 | |
| 12 | Brent Honeywell Jr.# | 3.000 | 2019 | |
| 13 | Gabriel Ynoa | 3.076 | 2017 | |
| 14 | John Gast | 3.176 | 2017 | |
| 15 | Manny Banuelos# | 3.429 | 2014 | |
| 16 | Tobias Myers# | 3.500 | 2024 | |
| 17 | Osvaldo Bido# | 3.661 | 2024 | |
| 18 | Randall Delgado | 3.724 | 2013 | |
| 19 | Jakob Junis# | 3.857 | 2024 | |
| 19 | Maximo Castillo# | 3.857 | 2023 | |
| 21 | Emerson Hancock# | 4.000 | 2023 | |
| 22 | Mike Vinson | 4.109 | 2016 | |
| 23 | Paolo Espino# | 4.119 | 2017 | |
| 23 | Collin Wiles# | 4.119 | 2023 | |
| 25 | Jose Alvarez | 4.190 | 2014 | |
| 26 | Alex Cobb# | 4.696 | 2013 | |
| 27 | Brian Matusz | 5.500 | 2013 | |
| 28 | Cody Morris# | 5.510 | 2023 | |
| 29 | Brooks Raley# | 5.786 | 2016 | |
| 30 | Trevor Rogers# | 5.891 | 2025 | |
| 31 | Brady Rodgers | 6.353 | 2017 | |
| 32 | T.J. House | 6.407 | 2017 | |
| 33 | Nick Travieso | 6.500 | 2016 | |
| 34 | Jesse Biddle | 6.612 | 2015 | |
| 35 | Jarred Cosart | 6.623 | 2013 | |
| 36 | Nicholas Kingham | 7.020 | 2015 | |
| 37 | Nathan Eovaldi# | 7.105 | 2013 | |
| 38 | Jack Flaherty# | 7.312 | 2018 |
