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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Kyle Zimmer | 2.438 | 2016 | |
| 2 | Sean Nolin | 2.979 | 2015 | |
| 3 | Andre Jackson# | 3.028 | 2023 | |
| 4 | Connor Thomas# | 3.252 | 2022 | |
| 5 | Blake Treinen# | 3.321 | 2015 | |
| 6 | Danny Rosenbaum | 3.422 | 2015 | |
| 7 | Jack Wynkoop | 3.479 | 2021 | |
| 8 | Jacob Turner | 3.514 | 2017 | |
| 9 | Nathan Wiles# | 3.551 | 2023 | |
| 10 | Carlos Contreras | 3.585 | 2015 | |
| 11 | Andrew Wantz# | 3.631 | 2021 | |
| 12 | Brent Honeywell Jr.# | 3.667 | 2017 | |
| 13 | Carlos Pimentel | 3.720 | 2017 | |
| 14 | Alec Marsh# | 3.780 | 2023 | |
| 15 | Shane Carle | 3.829 | 2017 | |
| 16 | Thomas Szapucki# | 3.899 | 2021 | |
| 17 | Deck McGuire | 3.940 | 2017 | |
| 18 | Jake Faria# | 3.951 | 2016 | |
| 19 | Ben Meyer | 3.984 | 2021 | |
| 20 | Raul Alcantara# | 4.007 | 2017 | |
| 21 | Kevin P. Smith | 4.019 | 2020 | |
| 22 | Caleb Cotham | 4.084 | 2015 | |
| 23 | Brady Feigl# | 4.119 | 2022 | |
| 24 | Trevor Bauer | 4.124 | 2013 | |
| 25 | Blake Treinen# | 4.154 | 2014 | |
| 25 | Felix Jorge | 4.154 | 2021 | |
| 27 | Steven Wright | 4.191 | 2021 | |
| 28 | Brett Graves | 4.233 | 2020 | |
| 29 | Taylor Rogers# | 4.281 | 2016 | |
| 30 | Jordan Yamamoto# | 4.300 | 2022 | |
| 31 | Drew Harrington | 4.320 | 2021 | |
| 32 | Kyle Lobstein | 4.349 | 2020 | |
| 33 | Matthew Boyd# | 4.355 | 2017 | |
| 34 | Brody McCullough# | 4.369 | 2025 | |
| 35 | Genesis Cabrera# | 4.389 | 2021 | |
| 35 | Marcus Walden | 4.389 | 2014 | |
| 37 | Christian Bergman | 4.418 | 2014 | |
| 38 | Jesse Scholtens# | 4.460 | 2021 | |
| 39 | Jason Hursh | 4.518 | 2016 | |
| 40 | Blake Bivens | 4.532 | 2019 | |
| 41 | Jack Leiter# | 4.561 | 2023 | |
| 42 | Ryan Garcia# | 4.580 | 2022 | |
| 42 | Tommy Milone | 4.580 | 2020 | |
| 44 | Percy Garner | 4.653 | 2016 | |
| 45 | Slade Cecconi# | 4.660 | 2024 | |
| 46 | Robert Dugger | 4.661 | 2018 | |
| 47 | Trevor Bauer | 4.664 | 2014 | |
| 48 | Aaron Brooks | 4.696 | 2018 | |
| 49 | Steven Johnson | 4.726 | 2013 | |
| 50 | Taylor Hill | 4.729 | 2015 | |
| 51 | William Roberts | 4.732 | 2017 | |
| 52 | Austen Williams | 4.747 | 2019 | |
| 53 | Kyle McGowin# | 4.751 | 2021 | |
| 54 | Jon Heasley# | 4.754 | 2023 | |
| 55 | Alec Hansen | 4.805 | 2021 | |
| 56 | R.J. Alaniz | 4.810 | 2014 | |
| 57 | Ricky Knapp | 4.817 | 2018 | |
| 58 | Kyle Tyler# | 4.819 | 2024 | |
| 59 | Devin Jones | 4.848 | 2015 | |
| 60 | Trystan Vrieling# | 4.858 | 2025 | |
| 61 | George Soriano# | 4.874 | 2023 | |
| 62 | Cade Horton# | 4.882 | 2024 | |
| 63 | Yohan Pino | 4.935 | 2014 | |
| 64 | Edwin Diaz# | 4.952 | 2016 | |
| 65 | Nick Nastrini# | 4.972 | 2024 | |
| 66 | Logan Workman# | 4.987 | 2024 | |
| 67 | Michael Roth | 4.994 | 2014 | |
| 68 | Phil Irwin | 4.996 | 2013 | |
| 69 | Chris O'Grady | 5.059 | 2017 | |
| 70 | Misael Siverio | 5.074 | 2016 | |
| 71 | Sean Nolin | 5.101 | 2014 | |
| 72 | Andrew Wantz# | 5.110 | 2020 | |
| 73 | Taylor Hill | 5.117 | 2014 | |
| 74 | Deck McGuire | 5.135 | 2015 | |
| 75 | Brandon Birdsell# | 5.143 | 2024 | |
| 76 | Devin Smeltzer# | 5.161 | 2021 | |
| 77 | Aaron West | 5.166 | 2016 | |
| 78 | Nick Zwack# | 5.192 | 2024 | |
| 79 | Mason Barnett# | 5.197 | 2024 | |
| 80 | Chris Gloor | 5.199 | 2015 | |
| 81 | Matthew Lujan | 5.218 | 2017 | |
| 82 | Roansy Contreras# | 5.220 | 2025 | |
| 83 | Nick Lodolo# | 5.246 | 2020 | |
| 84 | Henry Sosa | 5.266 | 2014 | |
| 85 | Drake Britton | 5.273 | 2013 | |
| 86 | Steven Zobac# | 5.275 | 2025 | |
| 87 | Alec Marsh# | 5.279 | 2022 | |
| 88 | Simon Castro | 5.287 | 2015 | |
| 89 | Wil Crowe# | 5.295 | 2020 | |
| 90 | Jayson Aquino | 5.387 | 2018 | |
| 91 | Alex Cook# | 5.412 | 2025 | |
| 92 | Nathan Bannister | 5.423 | 2018 | |
| 93 | Derek Diamond# | 5.507 | 2025 | |
| 94 | Logan Allen# | 5.524 | 2020 | |
| 95 | Cory Mazzoni | 5.540 | 2014 | |
| 96 | Severino Gonzalez | 5.547 | 2015 | |
| 97 | Jason Hursh | 5.572 | 2015 | |
| 98 | Chris Gloor | 5.573 | 2014 | |
| 99 | A.J. Puckett# | 5.575 | 2019 | |
| 100 | Keith Couch | 5.618 | 2014 |
