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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Joe Hardy# | 2.05 | 2023-2034 | |
| 2 | Tanner Johnson# | 2.36 | 2024-2034 | |
| 3 | Ed Armstrong# | 2.62 | 2021-2034 | |
| 4 | Claude Howard | 2.63 | 2012-2029 | |
| 5 | Félix Reina# | 2.70 | 2028-2034 | |
| 6 | Adrien Clément | 2.74 | 2015-2034 | |
| 7 | Gary Payne | 2.94 | 2012-2024 | |
| 8 | Soleh Purbacaraka# | 3.06 | 2023-2034 | |
| 9 | Michael Burton | 3.13 | 2018-2028 | |
| 10 | Tokaji Goto | 3.15 | 2017-2033 | |
| 10 | Hariz Sahir# | 3.15 | 2022-2034 | |
| 12 | Dennis Inman | 3.20 | 2012-2022 | |
| 13 | Aaron Taylor | 3.23 | 2017-2030 | |
| 13 | Andrés Nevárez | 3.23 | 2017-2032 | |
| 15 | Pat Short | 3.27 | 2015-2026 | |
| 16 | Jack English | 3.28 | 2013-2024 | |
| 16 | Nobuhisa Sumita | 3.28 | 2020-2032 | |
| 18 | Christian Wallace# | 3.30 | 2022-2034 | |
| 19 | Nelson Taylor | 3.32 | 2013-2026 | |
| 20 | Caiden Greenshield# | 3.33 | 2030-2034 | |
| 20 | Peter Miner# | 3.33 | 2025-2034 | |
| 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 | Leon King | 3.42 | 2015-2029 | |
| 26 | Micheal Coleman | 3.42 | 2012-2024 | |
| 28 | Mitsunari Kobayashi# | 3.43 | 2028-2034 | |
| 29 | Darryl Bradshaw | 3.45 | 2012-2022 | |
| 29 | Maurice Gould* | 3.45 | 2012-2030 | |
| 31 | Diego Santiago# | 3.47 | 2029-2034 | |
| 32 | Tomás Bravo# | 3.48 | 2023-2034 | |
| 33 | Carlos Núñes | 3.49 | 2016-2034 | |
| 34 | Masafumi Tamura# | 3.51 | 2024-2034 | |
| 35 | Kalyanavarman Nagaraj# | 3.53 | 2022-2034 | |
| 36 | Joey Steamer# | 3.58 | 2030-2034 | |
| 37 | Anthony Atkinson | 3.59 | 2013-2031 | |
| 38 | José Gallegos | 3.61 | 2016-2032 | |
| 38 | Marcos León# | 3.61 | 2019-2034 | |
| 40 | Robert Long | 3.63 | 2013-2027 | |
| 41 | Cohen Brouillette* | 3.66 | 2015-2028 | |
| 42 | Peter Klein | 3.67 | 2012-2022 | |
| 43 | Wilson Deleón# | 3.70 | 2024-2034 | |
| 44 | Félix Betancourt | 3.71 | 2018-2032 | |
| 45 | Jeremy Woods | 3.73 | 2013-2023 | |
| 46 | Ross Allan# | 3.75 | 2024-2034 | |
| 47 | Brandon Wilson | 3.76 | 2012-2021 | |
| 47 | Ángel Ruíz# | 3.76 | 2027-2034 | |
| 49 | Rodrigo Garza# | 3.77 | 2029-2034 | |
| 50 | Maulik Shaw# | 3.78 | 2023-2034 | |
| 50 | Felipe Rodríguez# | 3.78 | 2028-2034 | |
| 52 | Nathan Wilson | 3.79 | 2012-2022 | |
| 52 | Kinnosuke Sato | 3.79 | 2016-2030 | |
| 54 | Joe Russell | 3.83 | 2012-2023 | |
| 55 | Sixto Lavio | 3.84 | 2012-2021 | |
| 55 | Paul Barrett# | 3.84 | 2022-2034 | |
| 57 | Joachim Doucet# | 3.88 | 2024-2034 | |
| 58 | António Gómez | 3.89 | 2012-2022 | |
| 59 | Ze-dong Zhang# | 3.90 | 2021-2034 | |
| 60 | Kirk Snyder | 3.92 | 2017-2029 | |
| 60 | Manuel Ruíz | 3.92 | 2012-2020 | |
| 60 | James Thompson# | 3.92 | 2025-2034 | |
| 63 | Joe Good# | 3.93 | 2024-2034 | |
| 64 | Curt Rhodes | 3.96 | 2017-2031 | |
| 64 | Felipe Clavijo | 3.96 | 2019-2030 | |
| 64 | Tom O'Day | 3.96 | 2018-2032 | |
| 67 | William Howard | 3.98 | 2016-2024 | |
| 67 | Adhipa Vemireddy# | 3.98 | 2024-2034 | |
| 69 | Ti-an Dan# | 3.99 | 2022-2034 | |
| 70 | Royce Butterfield | 4.00 | 2012-2019 | |
| 70 | Steve Johnson | 4.00 | 2012-2022 | |
| 72 | Ray Weeks | 4.04 | 2022-2032 | |
| 73 | Coco Yamashita# | 4.06 | 2019-2033 | |
| 73 | Toin Hara# | 4.06 | 2029-2034 | |
| 75 | Jose Albertrani# | 4.07 | 2026-2034 | |
| 75 | Lou Latulippe | 4.07 | 2016-2031 | |
| 77 | Doyle Sullivan# | 4.08 | 2024-2034 | |
| 77 | Terry Hill# | 4.08 | 2026-2032 | |
| 77 | Adam Thomas | 4.08 | 2012-2021 | |
| 80 | Sotatsu Hayagawa# | 4.10 | 2019-2034 | |
| 80 | Jan Shirazi# | 4.10 | 2023-2034 | |
| 82 | José Rivera | 4.12 | 2021-2032 | |
| 83 | Matt Quinlan# | 4.13 | 2022-2034 | |
| 83 | Raúl Pérez | 4.13 | 2012-2021 | |
| 85 | Jake Nelson | 4.14 | 2012-2030 | |
| 85 | Cal Henry | 4.14 | 2012-2028 | |
| 87 | Kent Rose | 4.15 | 2012-2022 | |
| 87 | Yohann Bosler# | 4.15 | 2024-2034 | |
| 89 | Salah bin Atif# | 4.16 | 2026-2034 | |
| 89 | Allen Cox# | 4.16 | 2022-2034 | |
| 91 | Mal Tosewell | 4.17 | 2019-2029 | |
| 91 | Bryce Hesketh# | 4.17 | 2019-2034 | |
| 93 | Roberto Martínez | 4.18 | 2012-2023 | |
| 93 | Elias Bowen# | 4.18 | 2026-2034 | |
| 95 | Jeff Kimball | 4.19 | 2020-2029 | |
| 95 | Héctor Zúñiga# | 4.19 | 2026-2034 | |
| 95 | Benjamin Piece# | 4.19 | 2027-2033 | |
| 95 | Minh-Duc Pamungkas# | 4.19 | 2025-2034 | |
| 99 | Lewis Portsmouth# | 4.20 | 2026-2034 | |
| 99 | Luis Sánchez# | 4.20 | 2027-2033 |
