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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Pin-zhen Au# | 0.72 | 2027-2033 | |
| 2 | Félix Reina# | 0.87 | 2028-2033 | |
| 3 | Ashoka Pancholi# | 1.25 | 2023-2033 | |
| 4 | Doyle Sullivan# | 1.44 | 2024-2033 | |
| 5 | Giobbe Tadiotto# | 1.71 | 2026-2033 | |
| 6 | Clarence Byrd# | 1.86 | 2021-2033 | |
| 7 | Dennis Inman | 1.87 | 2012-2022 | |
| 8 | Soleh Purbacaraka# | 1.89 | 2023-2033 | |
| 9 | Allen Cox# | 2.09 | 2022-2033 | |
| 10 | Paul Johnston# | 2.25 | 2028-2033 | |
| 11 | Kunihiko Mizuno# | 2.30 | 2025-2033 | |
| 12 | John Martin | 2.33 | 2013-2027 | |
| 13 | Domingo Peña | 2.41 | 2012-2020 | |
| 14 | Kalyanavarman Nagaraj# | 2.45 | 2022-2033 | |
| 15 | Jonathan Martin | 2.48 | 2017-2031 | |
| 16 | Jon Lewis | 2.55 | 2012-2030 | |
| 17 | Christian Wallace# | 2.64 | 2022-2033 | |
| 17 | William Miller# | 2.64 | 2020-2033 | |
| 19 | Gabin Martin | 2.65 | 2028-2033 | |
| 20 | Nate Gary# | 2.67 | 2020-2032 | |
| 21 | Rob Young | 2.68 | 2018-2029 | |
| 22 | Ed Lott | 2.74 | 2017-2029 | |
| 22 | Tokaji Goto# | 2.74 | 2017-2033 | |
| 24 | Tony López# | 2.75 | 2031-2033 | |
| 25 | Andrés Nevárez | 2.82 | 2017-2032 | |
| 26 | Teguh Suharto# | 2.83 | 2025-2032 | |
| 26 | Aaron Taylor | 2.83 | 2017-2030 | |
| 28 | Matt Quinlan# | 2.86 | 2022-2033 | |
| 29 | António Medrano# | 2.89 | 2023-2033 | |
| 30 | Nelson Taylor | 2.94 | 2013-2026 | |
| 31 | Adhipa Vemireddy# | 3.01 | 2024-2033 | |
| 31 | Peter Miner# | 3.01 | 2025-2033 | |
| 33 | Tanner Johnson# | 3.02 | 2024-2033 | |
| 34 | Carlos Núñes# | 3.03 | 2016-2033 | |
| 35 | Ross Allan# | 3.08 | 2024-2033 | |
| 36 | Mike Miller | 3.09 | 2012-2023 | |
| 37 | Homer Turner | 3.10 | 2012-2020 | |
| 38 | Jo-hsi Sang# | 3.14 | 2024-2033 | |
| 39 | Phoenix Smith# | 3.19 | 2022-2033 | |
| 39 | Josuke Fujihara# | 3.19 | 2031-2033 | |
| 41 | Shi-xian Le# | 3.27 | 2024-2033 | |
| 42 | Tomás Bravo# | 3.31 | 2023-2032 | |
| 43 | Fred Butler | 3.32 | 2017-2030 | |
| 44 | Felipe Arreola# | 3.35 | 2030-2033 | |
| 44 | Oniji Nakashima | 3.35 | 2019-2029 | |
| 46 | Anupradana Agarkar# | 3.38 | 2023-2033 | |
| 46 | Rodney Armstrong | 3.38 | 2012-2024 | |
| 48 | Cohen Brouillette* | 3.39 | 2015-2028 | |
| 49 | Bob Ruíz# | 3.44 | 2025-2033 | |
| 50 | Sotatsu Hayagawa# | 3.48 | 2019-2033 | |
| 51 | Khurshid Durrani# | 3.49 | 2023-2033 | |
| 52 | Joe Hardy# | 3.50 | 2023-2033 | |
| 53 | Ruberto Laranjeira | 3.52 | 2023-2031 | |
| 53 | Steve McBryde# | 3.52 | 2026-2033 | |
| 55 | Raúl Pérez | 3.55 | 2012-2021 | |
| 56 | Héctor Zúñiga# | 3.57 | 2026-2033 | |
| 57 | Terence McKinley | 3.61 | 2013-2023 | |
| 57 | Jack English | 3.61 | 2013-2024 | |
| 59 | Juan Luján | 3.63 | 2016-2028 | |
| 59 | Juan Mendoza# | 3.63 | 2020-2033 | |
| 61 | Adrien Clément# | 3.64 | 2015-2033 | |
| 62 | Bernalldo Rocchi# | 3.66 | 2023-2033 | |
| 62 | Pat Short | 3.66 | 2015-2026 | |
| 64 | Kent Williams# | 3.67 | 2027-2031 | |
| 64 | Ramón Castaneda | 3.67 | 2017-2028 | |
| 66 | Dylan Butlin# | 3.69 | 2025-2033 | |
| 67 | Robert Long | 3.72 | 2013-2027 | |
| 68 | Oliver Romero# | 3.74 | 2023-2033 | |
| 69 | Pablo Cuevas | 3.78 | 2017-2029 | |
| 70 | James Thompson# | 3.80 | 2025-2033 | |
| 70 | Manuel García | 3.80 | 2022-2028 | |
| 72 | Ange Schmit# | 3.81 | 2024-2033 | |
| 73 | Kirk Snyder | 3.83 | 2017-2029 | |
| 74 | Elmer Turner# | 3.86 | 2028-2032 | |
| 74 | Paul Barrett# | 3.86 | 2022-2033 | |
| 76 | Na'il bin Bashshar# | 3.89 | 2023-2033 | |
| 77 | Anthony Atkinson | 3.91 | 2013-2031 | |
| 78 | Max Grant# | 3.94 | 2022-2032 | |
| 78 | Landy Lu# | 3.94 | 2024-2033 | |
| 78 | Clayton O'Neil | 3.94 | 2016-2029 | |
| 81 | George Alexander Lewis | 3.96 | 2016-2025 | |
| 81 | Royce Butterfield | 3.96 | 2012-2019 | |
| 81 | John Bryan | 3.96 | 2015-2025 | |
| 81 | Kuniyoshi Hasegawa | 3.96 | 2021-2029 | |
| 85 | Alan Buckley | 3.97 | 2017-2029 | |
| 86 | Ángel Ruíz# | 3.99 | 2027-2033 | |
| 87 | Ray Weeks | 4.01 | 2022-2032 | |
| 88 | Iván Morales# | 4.02 | 2028-2032 | |
| 88 | Maurice Gould | 4.02 | 2012-2030 | |
| 90 | Luis Vega# | 4.05 | 2019-2033 | |
| 91 | Rod Larcombe# | 4.08 | 2024-2032 | |
| 92 | Jose Albertrani# | 4.09 | 2026-2033 | |
| 93 | Brian Berry | 4.10 | 2022-2030 | |
| 94 | Luis López | 4.14 | 2014-2024 | |
| 95 | Kinnosuke Sato | 4.15 | 2016-2030 | |
| 95 | Mitsunari Kobayashi# | 4.15 | 2028-2033 | |
| 95 | Diego Santiago# | 4.15 | 2029-2033 | |
| 95 | Brandon Wilson | 4.15 | 2012-2021 | |
| 99 | Masafumi Tamura# | 4.16 | 2024-2033 | |
| 100 | Morgan Tyson# | 4.18 | 2025-2033 |
