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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jeff Ames | 3.082 | 2015 | |
| 2 | Adam Ottavino# | 3.084 | 2007 | |
| 3 | Kevin McAvoy | 3.235 | 2018 | |
| 4 | Manny Banuelos# | 3.242 | 2013 | |
| 5 | Adam Scott | 3.259 | 2021 | |
| 6 | Erick Leal# | 3.289 | 2021 | |
| 7 | Manaure Martinez | 3.330 | 2015 | |
| 8 | Asher Wojciechowski | 3.344 | 2021 | |
| 9 | David Goforth | 3.382 | 2013 | |
| 10 | Matt Frisbee# | 3.431 | 2021 | |
| 10 | C.J. Riefenhauser | 3.431 | 2013 | |
| 12 | Denyi Reyes# | 3.455 | 2020 | |
| 13 | Gustavo Gomez | 3.475 | 2016 | |
| 14 | Gus Varland# | 3.507 | 2021 | |
| 15 | Gus Varland# | 3.554 | 2022 | |
| 16 | Rafael Montero# | 3.579 | 2013 | |
| 17 | Jake Stinnett | 3.584 | 2017 | |
| 18 | Jeff Ames | 3.736 | 2016 | |
| 19 | Riley Davis# | 3.781 | 2023 | |
| 20 | Denyi Reyes# | 3.789 | 2021 | |
| 21 | Valente Bellozo# | 3.840 | 2024 | |
| 22 | Tanner Peters | 3.865 | 2015 | |
| 23 | Jayden Murray# | 3.899 | 2021 | |
| 24 | Tanner Peters | 3.925 | 2014 | |
| 25 | John Rooney# | 4.056 | 2022 | |
| 26 | Seth Blair | 4.080 | 2013 | |
| 27 | Jose Taveras | 4.089 | 2020 | |
| 28 | Rylan Kaufman# | 4.140 | 2023 | |
| 29 | Michael Fulmer# | 4.172 | 2015 | |
| 30 | Nick Fraze# | 4.254 | 2022 | |
| 31 | Jayson Aquino | 4.293 | 2015 | |
| 32 | Michael Strong | 4.315 | 2015 | |
| 33 | Parker Markel | 4.331 | 2013 | |
| 34 | Jordan Johnson | 4.340 | 2020 | |
| 35 | Eduardo Rodriguez# | 4.391 | 2015 | |
| 36 | Dallas Beeler | 4.421 | 2013 | |
| 37 | Chris Rodriguez# | 4.468 | 2020 | |
| 38 | Brendon Little# | 4.585 | 2021 | |
| 39 | Eric Jokisch# | 4.641 | 2013 | |
| 40 | Austin Cox# | 4.685 | 2021 | |
| 41 | Jon Olsen# | 4.739 | 2022 | |
| 42 | Timothy Shibuya | 4.746 | 2014 | |
| 43 | Eduardo Rodriguez# | 4.762 | 2014 | |
| 44 | Adam Kloffenstein# | 4.800 | 2025 | |
| 45 | Mason Radeke | 4.893 | 2017 | |
| 46 | Dallas Litscher | 4.915 | 2021 | |
| 47 | Silfredo Garcia | 4.929 | 2015 | |
| 48 | Jorge Guzman# | 4.979 | 2021 | |
| 49 | Manuel Espinoza# | 5.048 | 2024 | |
| 50 | Lucas Knowles# | 5.118 | 2023 | |
| 51 | Jack Leftwich# | 5.132 | 2023 | |
| 52 | Jordan Pries | 5.137 | 2013 | |
| 53 | Jordan Johnson | 5.140 | 2018 | |
| 54 | Matt Brazis | 5.149 | 2014 | |
| 55 | Jonathan Dziedzic | 5.197 | 2015 | |
| 56 | Michael Fulmer# | 5.213 | 2014 | |
| 57 | Ian Oxnevad | 5.214 | 2018 | |
| 58 | Mike Ruff# | 5.220 | 2022 | |
| 59 | Luis Diaz | 5.250 | 2014 | |
| 60 | Parker Bridwell | 5.285 | 2015 | |
| 61 | Nick Hull# | 5.362 | 2025 | |
| 62 | Dae-Eun Rhee | 5.400 | 2014 | |
| 63 | Dan Camarena# | 5.424 | 2017 | |
| 64 | Miguel Sulbaran | 5.526 | 2014 | |
| 65 | Evan Fitterer# | 5.551 | 2023 | |
| 66 | Jack Perkins# | 5.595 | 2025 | |
| 67 | Tyler Woessner# | 5.671 | 2024 | |
| 68 | Nick Dean# | 5.745 | 2025 | |
| 69 | Freicer Perez | 5.853 | 2018 | |
| 70 | Silfredo Garcia | 6.184 | 2014 | |
| 71 | Jeff Ames | 6.429 | 2014 | |
| 72 | Jonathan Dziedzic | 7.129 | 2014 | |
| 73 | Blake Shouse | 7.157 | 2014 |
