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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Curtis Peters# | 2.268 | 2019 | |
| 2 | James Russell | 2.358 | 2013 | |
| 3 | Ethan Reed# | 2.439 | 2021 | |
| 4 | Adam Carr# | 2.501 | 2025 | |
| 5 | Josh Garrett# | 2.564 | 2022 | |
| 6 | Bryan Mata# | 2.778 | 2020 | |
| 7 | Jose Jose | 2.882 | 2015 | |
| 8 | Cole Winn# | 2.943 | 2020 | |
| 9 | Carson Whisenhunt# | 2.946 | 2024 | |
| 10 | Matt Cavanagh# | 2.966 | 2022 | |
| 10 | Luis Gutierrez# | 2.966 | 2025 | |
| 12 | Matthew Henderson# | 2.984 | 2024 | |
| 13 | Landon Marceaux# | 3.022 | 2024 | |
| 14 | Jack Kochanowicz# | 3.046 | 2024 | |
| 15 | Richard Mann | 3.047 | 2019 | |
| 16 | Frank Mozzicato# | 3.055 | 2025 | |
| 17 | Matt Parker# | 3.058 | 2021 | |
| 18 | Will Cruz# | 3.076 | 2025 | |
| 19 | Hunter Barco# | 3.084 | 2022 | |
| 20 | Shane Baz# | 3.093 | 2020 | |
| 21 | Griffin Brewster# | 3.097 | 2025 | |
| 22 | J.W. Hertzberg# | 3.113 | 2024 | |
| 23 | Dan MacCombie# | 3.132 | 2025 | |
| 24 | Steve Chapman# | 3.141 | 2018 | |
| 25 | Chad Kispert# | 3.154 | 2023 | |
| 26 | Josh Sharkey# | 3.166 | 2023 | |
| 27 | Jonathan Ware | 3.180 | 2017 | |
| 28 | Jonathan Pettibone | 3.186 | 2017 | |
| 29 | Ralph Travis# | 3.195 | 2022 | |
| 30 | Orlando Gonzáles# | 3.198 | 2022 | |
| 31 | Carlos Navarro# | 3.208 | 2017 | |
| 32 | Lucas Giolito# | 3.209 | 2015 | |
| 33 | Ryan Cusick# | 3.216 | 2024 | |
| 34 | Carmen Mlodzinski# | 3.228 | 2023 | |
| 35 | Seth Lonsway# | 3.304 | 2023 | |
| 36 | Ian Bedell# | 3.306 | 2023 | |
| 37 | Hector Rondon | 3.347 | 2016 | |
| 38 | Carter Parker# | 3.359 | 2020 | |
| 39 | Justin Grimm | 3.375 | 2016 | |
| 40 | Kyle Zimmer | 3.381 | 2015 | |
| 41 | Ryan Hilinski# | 3.399 | 2023 | |
| 42 | Braden Larue# | 3.449 | 2022 | |
| 43 | Marcus McMaryion# | 3.486 | 2023 | |
| 44 | Mitchell Traver# | 3.508 | 2017 | |
| 45 | Luke Buxbury# | 3.511 | 2025 | |
| 46 | Anthony Meo | 3.519 | 2012 | |
| 47 | Dylan Ross# | 3.531 | 2024 | |
| 48 | Triston Casas# | 3.553 | 2022 | |
| 49 | Ralph Travis# | 3.562 | 2021 | |
| 50 | Su-Min Jung | 3.567 | 2016 | |
| 51 | Chubba Purdy# | 3.577 | 2024 | |
| 52 | Juan Escobar# | 3.589 | 2024 | |
| 53 | Matthew Laney | 3.604 | 2018 | |
| 54 | Vance Halili | 3.614 | 2019 | |
| 55 | Ian Bedell# | 3.620 | 2025 | |
| 56 | Soichiro Chikafuji | 3.626 | 2018 | |
| 57 | Taylor Jungmann | 3.642 | 2013 | |
| 58 | Will Allison# | 3.659 | 2024 | |
| 59 | Brandon Dixon# | 3.664 | 2018 | |
| 60 | Tim Cates# | 3.720 | 2020 | |
| 61 | Enny Romero | 3.724 | 2013 | |
| 62 | Matt Canterino# | 3.752 | 2022 | |
| 63 | Justin Bullock# | 3.763 | 2024 | |
| 64 | Brady Dutcher# | 3.770 | 2023 | |
| 65 | Jonathan Pettibone | 3.773 | 2016 | |
| 66 | Garrett Gould | 3.826 | 2013 | |
| 67 | Brian Johnson# | 3.874 | 2016 | |
| 68 | Anthony Kay# | 3.930 | 2020 | |
| 69 | Felix Sterling | 3.951 | 2016 | |
| 70 | Ian Bedell# | 3.953 | 2024 | |
| 71 | Carl Deer# | 3.972 | 2018 | |
| 72 | Joe Allen# | 3.974 | 2021 | |
| 73 | Randall Peña | 4.002 | 2018 | |
| 74 | Oswaldo Mieres | 4.019 | 2015 | |
| 75 | Júlio Ledesma | 4.024 | 2015 | |
| 76 | Victor Sanchez | 4.044 | 2016 | |
| 77 | Alexander Colome | 4.053 | 2012 | |
| 78 | Mason Pelio# | 4.091 | 2024 | |
| 79 | Jack Leiter# | 4.099 | 2022 | |
| 80 | Dan Dukes | 4.113 | 2017 | |
| 81 | Taylor Guerrieri | 4.114 | 2012 | |
| 82 | Matt Lollis | 4.144 | 2013 | |
| 83 | Jayson Schroeder# | 4.145 | 2022 | |
| 84 | Tanner McKee# | 4.146 | 2023 | |
| 85 | Erik Thomas# | 4.150 | 2024 | |
| 86 | Chase Anderson | 4.158 | 2012 | |
| 87 | Alonso Sánchez | 4.174 | 2016 | |
| 88 | Hector Rondon | 4.243 | 2015 | |
| 88 | Jesse Darrah | 4.243 | 2014 | |
| 90 | Paxton Meyer# | 4.248 | 2022 | |
| 91 | Hudson Card# | 4.257 | 2023 | |
| 92 | Jorge Rodríguez# | 4.275 | 2021 | |
| 93 | Archie Bradley# | 4.279 | 2014 | |
| 94 | Ismael Guillon | 4.330 | 2015 | |
| 95 | Ernest Mabee# | 4.336 | 2024 | |
| 96 | Abel M. De Los Santos | 4.390 | 2014 | |
| 97 | Adam Conley | 4.391 | 2014 | |
| 98 | Nathan Harris# | 4.402 | 2018 | |
| 99 | Brandon Beard# | 4.423 | 2022 | |
| 100 | Alexander Colome | 4.492 | 2013 |
