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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Joan Adon# | 2.836 | 2026 | |
| 2 | Marcus Stroman# | 3.134 | 2014 | |
| 3 | Charlie Barnes# | 3.209 | 2022 | |
| 4 | Brett Kerry# | 3.300 | 2024 | |
| 5 | Brad Bergesen | 3.477 | 2015 | |
| 6 | Carl Edwards Jr.# | 3.505 | 2015 | |
| 7 | David Buchanan# | 3.517 | 2023 | |
| 8 | Austin Pruitt# | 3.582 | 2017 | |
| 9 | Marcelo Martinez# | 3.622 | 2023 | |
| 10 | Adalberto Mejia | 3.705 | 2017 | |
| 11 | Brad Peacock | 3.707 | 2016 | |
| 12 | David Buchanan# | 3.715 | 2022 | |
| 13 | Odrisamer Despaigne# | 3.759 | 2023 | |
| 14 | Ryan Carpenter# | 3.810 | 2021 | |
| 15 | Odrisamer Despaigne# | 3.820 | 2022 | |
| 16 | Brad Bergesen | 3.864 | 2014 | |
| 17 | Jakob Junis# | 3.944 | 2017 | |
| 18 | William Cuevas# | 3.949 | 2023 | |
| 19 | Brady Lail | 3.961 | 2016 | |
| 20 | Spencer Arrighetti# | 4.033 | 2026 | |
| 21 | Casey Kelly# | 4.037 | 2022 | |
| 22 | Mark Appel | 4.095 | 2015 | |
| 23 | Drew Rucinski# | 4.098 | 2026 | |
| 24 | Carson Whisenhunt# | 4.150 | 2025 | |
| 25 | Dylan Axelrod | 4.176 | 2014 | |
| 26 | Jacob Nix# | 4.183 | 2023 | |
| 27 | Rob Whalen | 4.206 | 2016 | |
| 28 | Michael Knorr# | 4.357 | 2026 | |
| 29 | Michael Kopech# | 4.374 | 2018 | |
| 30 | Luis Madero# | 4.390 | 2023 | |
| 31 | Jacob Turner | 4.395 | 2014 | |
| 32 | Cody Martin | 4.405 | 2013 | |
| 33 | Tim Melville | 4.408 | 2015 | |
| 34 | Ryan Dennick | 4.443 | 2015 | |
| 35 | Mason Adams# | 4.473 | 2025 | |
| 36 | Drew Rucinski# | 4.491 | 2024 | |
| 37 | Casey Kelly# | 4.534 | 2024 | |
| 38 | Casey Kelly# | 4.545 | 2023 | |
| 39 | Williams Perez | 4.560 | 2021 | |
| 40 | Colin Rea# | 4.575 | 2021 | |
| 41 | Luis Madero# | 4.577 | 2022 | |
| 42 | Miguel Celestino | 4.622 | 2015 | |
| 43 | Barret Loux | 4.643 | 2016 | |
| 44 | Robbie Erlin | 4.831 | 2017 | |
| 45 | Nick Travieso | 4.848 | 2015 | |
| 46 | Jacob Miller# | 4.855 | 2026 | |
| 47 | Mikey O'Brien | 4.857 | 2015 | |
| 48 | Steven Wright | 4.870 | 2015 | |
| 49 | Zac Lowther# | 4.909 | 2023 | |
| 50 | Ryan Carpenter# | 4.940 | 2022 | |
| 51 | Mario Hollands | 4.979 | 2016 | |
| 52 | Eric Hacker | 5.017 | 2018 | |
| 53 | Noah Davis# | 5.055 | 2026 | |
| 54 | Eric Hacker | 5.082 | 2020 | |
| 55 | Sam Gaviglio | 5.112 | 2017 | |
| 56 | Zach Thornton# | 5.116 | 2026 | |
| 56 | Justin Dunn# | 5.116 | 2024 | |
| 58 | Ariel Pena | 5.140 | 2015 | |
| 59 | Mark Appel | 5.151 | 2016 | |
| 60 | Tim Melville | 5.170 | 2014 | |
| 60 | Zech Lemond | 5.170 | 2017 | |
| 62 | Trenton Wallace# | 5.185 | 2025 | |
| 63 | Jack Patterson | 5.226 | 2021 | |
| 64 | Roniel Raudes# | 5.248 | 2025 | |
| 65 | Ryan Carpenter# | 5.264 | 2023 | |
| 66 | Tejay Antone# | 5.352 | 2024 | |
| 67 | James McArthur# | 5.365 | 2023 | |
| 68 | William Cuevas# | 5.411 | 2024 | |
| 69 | Logan Darnell | 5.421 | 2015 | |
| 70 | Orangel Arenas | 5.459 | 2015 | |
| 71 | Drew Rucinski# | 5.475 | 2021 | |
| 72 | Julian Aguiar# | 5.514 | 2025 | |
| 73 | Eric Hacker | 5.588 | 2016 | |
| 74 | Zachary Nuding | 5.595 | 2013 | |
| 75 | Kyle Lobstein | 5.608 | 2013 | |
| 76 | Aaron Thompson | 5.645 | 2013 | |
| 77 | Ryan Murphy# | 5.674 | 2025 | |
| 78 | Brett Kerry# | 5.697 | 2022 | |
| 79 | Seth Shuman# | 5.902 | 2025 | |
| 80 | Marcelo Martinez# | 5.980 | 2026 | |
| 81 | Ryan Rolison# | 6.191 | 2024 | |
| 82 | Nick Bush# | 6.298 | 2025 | |
| 83 | Dillon Peters# | 6.329 | 2025 | |
| 84 | Jordan Lyles# | 6.483 | 2025 | |
| 85 | David Festa# | 6.489 | 2024 | |
| 86 | Mitch Myers# | 6.665 | 2025 | |
| 87 | Joander Suarez# | 7.115 | 2025 | |
| 88 | Justin Nicolino | 7.331 | 2015 | |
| 89 | Pierson Ohl# | 7.570 | 2025 |
