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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Joe Hardy# | 2.10 | 2023-2033 | |
| 2 | Tanner Johnson# | 2.36 | 2024-2033 | |
| 3 | Claude Howard | 2.63 | 2012-2029 | |
| 4 | Adrien Clément# | 2.65 | 2015-2033 | |
| 5 | Félix Reina# | 2.73 | 2028-2033 | |
| 6 | Ed Armstrong# | 2.75 | 2021-2033 | |
| 7 | Gary Payne | 2.94 | 2012-2024 | |
| 8 | Soleh Purbacaraka# | 3.05 | 2023-2033 | |
| 9 | Michael Burton | 3.13 | 2018-2028 | |
| 10 | Tokaji Goto# | 3.15 | 2017-2033 | |
| 11 | Dennis Inman | 3.20 | 2012-2022 | |
| 12 | Peter Miner# | 3.22 | 2025-2033 | |
| 13 | Aaron Taylor | 3.23 | 2017-2030 | |
| 13 | Andrés Nevárez | 3.23 | 2017-2032 | |
| 15 | Mitsunari Kobayashi# | 3.24 | 2028-2033 | |
| 16 | Pat Short | 3.27 | 2015-2026 | |
| 17 | Jack English | 3.28 | 2013-2024 | |
| 17 | Nobuhisa Sumita# | 3.28 | 2020-2032 | |
| 19 | Christian Wallace# | 3.29 | 2022-2033 | |
| 20 | Nelson Taylor | 3.32 | 2013-2026 | |
| 21 | Joey Steamer# | 3.33 | 2030-2033 | |
| 22 | Baldassario Ardinghi# | 3.35 | 2023-2033 | |
| 23 | Jon Lewis | 3.37 | 2012-2030 | |
| 24 | Jonathan Martin | 3.39 | 2017-2031 | |
| 25 | Lonnie Powell | 3.41 | 2017-2029 | |
| 26 | Diego Santiago# | 3.42 | 2029-2033 | |
| 26 | Leon King | 3.42 | 2015-2029 | |
| 26 | Micheal Coleman | 3.42 | 2012-2024 | |
| 29 | Carlos Núñes# | 3.43 | 2016-2033 | |
| 30 | Darryl Bradshaw | 3.45 | 2012-2022 | |
| 30 | Maurice Gould | 3.45 | 2012-2030 | |
| 32 | Tomás Bravo# | 3.48 | 2023-2032 | |
| 33 | Masafumi Tamura# | 3.58 | 2024-2033 | |
| 34 | Anthony Atkinson | 3.59 | 2013-2031 | |
| 35 | Kalyanavarman Nagaraj# | 3.60 | 2022-2033 | |
| 36 | José Gallegos | 3.61 | 2016-2032 | |
| 37 | Robert Long | 3.63 | 2013-2027 | |
| 37 | Ross Allan# | 3.63 | 2024-2033 | |
| 37 | Felipe Rodríguez# | 3.63 | 2028-2033 | |
| 40 | Cohen Brouillette* | 3.66 | 2015-2028 | |
| 41 | Peter Klein | 3.67 | 2012-2022 | |
| 42 | Marcos León# | 3.68 | 2019-2033 | |
| 43 | Ángel Ruíz# | 3.69 | 2027-2033 | |
| 44 | Félix Betancourt# | 3.71 | 2018-2032 | |
| 45 | Jeremy Woods | 3.73 | 2013-2023 | |
| 46 | Brandon Wilson | 3.76 | 2012-2021 | |
| 47 | Nathan Wilson | 3.79 | 2012-2022 | |
| 47 | Kinnosuke Sato | 3.79 | 2016-2030 | |
| 49 | Joe Russell | 3.83 | 2012-2023 | |
| 50 | Sixto Lavio | 3.84 | 2012-2021 | |
| 50 | Paul Barrett# | 3.84 | 2022-2033 | |
| 52 | António Gómez | 3.89 | 2012-2022 | |
| 52 | Joe Good# | 3.89 | 2024-2033 | |
| 52 | Adhipa Vemireddy# | 3.89 | 2024-2033 | |
| 55 | Ze-dong Zhang# | 3.92 | 2021-2033 | |
| 55 | Kirk Snyder | 3.92 | 2017-2029 | |
| 55 | Manuel Ruíz | 3.92 | 2012-2020 | |
| 58 | James Thompson# | 3.94 | 2025-2033 | |
| 59 | Jose Albertrani# | 3.95 | 2026-2033 | |
| 60 | Curt Rhodes | 3.96 | 2017-2031 | |
| 60 | Felipe Clavijo | 3.96 | 2019-2030 | |
| 60 | Tom O'Day | 3.96 | 2018-2032 | |
| 63 | William Howard | 3.98 | 2016-2024 | |
| 64 | Royce Butterfield | 4.00 | 2012-2019 | |
| 64 | Steve Johnson | 4.00 | 2012-2022 | |
| 66 | Ti-an Dan# | 4.03 | 2022-2033 | |
| 67 | Ray Weeks | 4.04 | 2022-2032 | |
| 68 | Sotatsu Hayagawa# | 4.05 | 2019-2033 | |
| 69 | Coco Yamashita# | 4.06 | 2019-2033 | |
| 70 | Jan Shirazi# | 4.07 | 2023-2033 | |
| 70 | Lou Latulippe | 4.07 | 2016-2031 | |
| 72 | Terry Hill# | 4.08 | 2026-2032 | |
| 72 | Adam Thomas | 4.08 | 2012-2021 | |
| 72 | Yohann Bosler# | 4.08 | 2024-2033 | |
| 75 | Matt Quinlan# | 4.09 | 2022-2033 | |
| 76 | Allen Cox# | 4.12 | 2022-2033 | |
| 76 | José Rivera | 4.12 | 2021-2032 | |
| 78 | Raúl Pérez | 4.13 | 2012-2021 | |
| 79 | Jake Nelson | 4.14 | 2012-2030 | |
| 79 | Cal Henry | 4.14 | 2012-2028 | |
| 81 | Kent Rose | 4.15 | 2012-2022 | |
| 81 | Tom Hanson# | 4.15 | 2024-2033 | |
| 83 | Mal Tosewell | 4.17 | 2019-2029 | |
| 83 | Bryce Hesketh# | 4.17 | 2019-2033 | |
| 85 | Roberto Martínez | 4.18 | 2012-2023 | |
| 86 | Jeff Kimball | 4.19 | 2020-2029 | |
| 86 | Benjamin Piece# | 4.19 | 2027-2033 | |
| 88 | William Miller# | 4.20 | 2020-2033 | |
| 88 | Luis Sánchez# | 4.20 | 2027-2033 | |
| 88 | Nobuhisa Yamashita | 4.20 | 2017-2028 | |
| 91 | Morgan Tyson# | 4.21 | 2025-2033 | |
| 91 | Jin-woo Pi# | 4.21 | 2026-2033 | |
| 93 | Elias Bowen# | 4.22 | 2026-2033 | |
| 94 | Paul Johnston# | 4.25 | 2028-2033 | |
| 95 | Lewis Portsmouth# | 4.27 | 2026-2033 | |
| 95 | Ange Schmit# | 4.27 | 2024-2033 | |
| 95 | Lorenzo Soto# | 4.27 | 2017-2033 | |
| 95 | Júlio García | 4.27 | 2015-2029 | |
| 99 | Juan Luján | 4.28 | 2016-2028 | |
| 100 | Oniji Nakashima | 4.29 | 2019-2029 |
