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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 | Walker Lockett# | 2.676 | 2020 | |
| 3 | Sean Nolin | 2.979 | 2015 | |
| 4 | Andre Jackson# | 3.028 | 2023 | |
| 5 | Connor Thomas# | 3.252 | 2022 | |
| 6 | Blake Treinen# | 3.321 | 2015 | |
| 7 | Danny Rosenbaum | 3.422 | 2015 | |
| 8 | Arnaldo Hernandez# | 3.476 | 2020 | |
| 9 | Jack Wynkoop# | 3.479 | 2021 | |
| 10 | Conner Menez# | 3.503 | 2023 | |
| 11 | Jacob Turner | 3.514 | 2017 | |
| 12 | Matt Barnes# | 3.518 | 2014 | |
| 13 | Nathan Wiles# | 3.551 | 2023 | |
| 14 | Thomas Eshelman# | 3.584 | 2021 | |
| 15 | Carlos Contreras | 3.585 | 2015 | |
| 16 | Casey Coleman# | 3.594 | 2014 | |
| 17 | Andrew Wantz# | 3.631 | 2021 | |
| 18 | Brent Honeywell Jr.# | 3.667 | 2017 | |
| 19 | Carlos Pimentel | 3.720 | 2017 | |
| 20 | Alec Marsh# | 3.780 | 2023 | |
| 21 | Shane Carle# | 3.829 | 2017 | |
| 22 | Thomas Szapucki# | 3.899 | 2021 | |
| 23 | Deck McGuire | 3.940 | 2017 | |
| 24 | Jake Faria# | 3.951 | 2016 | |
| 25 | Tommy Wilson# | 3.981 | 2021 | |
| 26 | Ben Meyer | 3.984 | 2021 | |
| 27 | Dustin Beggs# | 3.994 | 2021 | |
| 28 | Raul Alcantara# | 4.007 | 2017 | |
| 29 | Kevin P. Smith# | 4.019 | 2020 | |
| 30 | Caleb Cotham | 4.084 | 2015 | |
| 31 | Brady Feigl# | 4.119 | 2022 | |
| 32 | Trevor Bauer# | 4.124 | 2013 | |
| 33 | Blake Treinen# | 4.154 | 2014 | |
| 33 | Felix Jorge | 4.154 | 2021 | |
| 35 | Steven Wright | 4.191 | 2021 | |
| 36 | Ian McKinney# | 4.193 | 2020 | |
| 37 | Brett Graves | 4.233 | 2020 | |
| 38 | Taylor Rogers# | 4.281 | 2016 | |
| 39 | Jordan Yamamoto# | 4.300 | 2022 | |
| 40 | Walker Lockett# | 4.315 | 2017 | |
| 41 | Drew Harrington# | 4.320 | 2021 | |
| 42 | Kyle Lobstein | 4.349 | 2020 | |
| 43 | Matt Boyd# | 4.355 | 2017 | |
| 44 | Conner Menez# | 4.362 | 2022 | |
| 45 | Genesis Cabrera# | 4.389 | 2021 | |
| 45 | Marcus Walden | 4.389 | 2014 | |
| 47 | Marco Gonzales# | 4.390 | 2017 | |
| 48 | Christian Bergman | 4.418 | 2014 | |
| 49 | Jesse Scholtens# | 4.460 | 2021 | |
| 50 | Arnaldo Hernandez# | 4.500 | 2021 | |
| 51 | Jason Hursh | 4.518 | 2016 | |
| 52 | Tyler Watson# | 4.531 | 2023 | |
| 53 | Blake Bivens | 4.532 | 2019 | |
| 54 | Kent Emanuel# | 4.558 | 2017 | |
| 55 | Jack Leiter# | 4.561 | 2023 | |
| 56 | Ryan Garcia# | 4.580 | 2022 | |
| 56 | Tommy Milone# | 4.580 | 2020 | |
| 58 | Nick Fanti# | 4.629 | 2019 | |
| 59 | Percy Garner | 4.653 | 2016 | |
| 60 | Robert Dugger# | 4.661 | 2018 | |
| 61 | Trevor Bauer# | 4.664 | 2014 | |
| 62 | Aaron Brooks | 4.696 | 2018 | |
| 63 | Steven Johnson | 4.726 | 2013 | |
| 64 | Taylor Hill | 4.729 | 2015 | |
| 65 | William Roberts | 4.732 | 2017 | |
| 66 | Austen Williams | 4.747 | 2019 | |
| 67 | Kyle McGowin# | 4.751 | 2021 | |
| 68 | Jon Heasley# | 4.754 | 2023 | |
| 69 | Alec Hansen | 4.805 | 2021 | |
| 70 | Ruben Alaniz# | 4.810 | 2014 | |
| 71 | Ricky Knapp | 4.817 | 2018 | |
| 72 | Devin Jones | 4.848 | 2015 | |
| 73 | George Soriano# | 4.874 | 2023 | |
| 74 | Yohan Pino | 4.935 | 2014 | |
| 75 | Brandon Barker# | 4.945 | 2021 | |
| 76 | Edwin Diaz# | 4.952 | 2016 | |
| 77 | Sam Coonrod# | 4.972 | 2017 | |
| 78 | Michael Roth | 4.994 | 2014 | |
| 79 | Phil Irwin | 4.996 | 2013 | |
| 80 | Chris O'Grady | 5.059 | 2017 | |
| 81 | Misael Siverio | 5.074 | 2016 | |
| 82 | Sean Nolin | 5.101 | 2014 | |
| 83 | Andrew Wantz# | 5.110 | 2020 | |
| 84 | Taylor Hill | 5.117 | 2014 | |
| 85 | Deck McGuire | 5.135 | 2015 | |
| 86 | Devin Smeltzer# | 5.161 | 2021 | |
| 87 | Aaron West | 5.166 | 2016 | |
| 88 | Chris Gloor | 5.199 | 2015 | |
| 89 | Matthew Lujan | 5.218 | 2017 | |
| 90 | Gage Hinsz# | 5.226 | 2022 | |
| 91 | Nick Lodolo# | 5.246 | 2020 | |
| 92 | A.J. Ladwig# | 5.248 | 2021 | |
| 93 | Henry Sosa | 5.266 | 2014 | |
| 94 | Drake Britton | 5.273 | 2013 | |
| 95 | Alec Marsh# | 5.279 | 2022 | |
| 96 | Simon Castro | 5.287 | 2015 | |
| 97 | Wil Crowe# | 5.295 | 2020 | |
| 98 | Jayson Aquino | 5.387 | 2018 | |
| 99 | Nathan Bannister | 5.423 | 2018 | |
| 100 | Pedro Payano# | 5.501 | 2021 |
