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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Félix Reina# | 0.87 | 2028-2034 | |
| 2 | Hariz Sahir# | 1.14 | 2022-2034 | |
| 3 | Ashoka Pancholi# | 1.25 | 2023-2034 | |
| 4 | Pin-zhen Au# | 1.27 | 2027-2034 | |
| 5 | Doyle Sullivan# | 1.44 | 2024-2034 | |
| 6 | Giobbe Tadiotto# | 1.71 | 2026-2033 | |
| 7 | Clarence Byrd# | 1.86 | 2021-2034 | |
| 8 | Dennis Inman | 1.87 | 2012-2022 | |
| 9 | Soleh Purbacaraka# | 2.08 | 2023-2034 | |
| 10 | Allen Cox# | 2.26 | 2022-2034 | |
| 11 | Kunihiko Mizuno# | 2.30 | 2025-2034 | |
| 11 | Alejandro Zorros# | 2.30 | 2031-2034 | |
| 13 | John Martin | 2.33 | 2013-2027 | |
| 14 | Abdul Razzaq Kharoti# | 2.41 | 2024-2034 | |
| 14 | Domingo Peña | 2.41 | 2012-2020 | |
| 16 | Kalyanavarman Nagaraj# | 2.46 | 2022-2034 | |
| 17 | Jonathan Martin | 2.48 | 2017-2031 | |
| 18 | Jon Lewis | 2.55 | 2012-2030 | |
| 19 | Paul Johnston# | 2.59 | 2028-2034 | |
| 19 | Tony López# | 2.59 | 2031-2034 | |
| 21 | Christian Wallace# | 2.64 | 2022-2034 | |
| 22 | Gabin Martin | 2.65 | 2028-2033 | |
| 23 | Nate Gary | 2.67 | 2020-2032 | |
| 24 | Rob Young | 2.68 | 2018-2029 | |
| 25 | Ed Lott | 2.74 | 2017-2029 | |
| 25 | Tokaji Goto | 2.74 | 2017-2033 | |
| 27 | Andrés Nevárez | 2.82 | 2017-2032 | |
| 28 | Teguh Suharto# | 2.83 | 2025-2034 | |
| 28 | Aaron Taylor | 2.83 | 2017-2030 | |
| 30 | Matt Quinlan# | 2.86 | 2022-2034 | |
| 31 | António Medrano# | 2.89 | 2023-2034 | |
| 32 | Nelson Taylor | 2.94 | 2013-2026 | |
| 33 | Ehrich Weiss# | 2.96 | 2032-2034 | |
| 34 | Carlos Núñes | 3.03 | 2016-2034 | |
| 35 | Tanner Johnson# | 3.09 | 2024-2034 | |
| 35 | Mike Miller | 3.09 | 2012-2023 | |
| 37 | Homer Turner | 3.10 | 2012-2020 | |
| 37 | Peter Miner# | 3.10 | 2025-2034 | |
| 39 | Jo-hsi Sang# | 3.14 | 2024-2034 | |
| 40 | Anupradana Agarkar# | 3.16 | 2023-2034 | |
| 41 | Ross Allan# | 3.22 | 2024-2034 | |
| 42 | William Miller | 3.23 | 2020-2034 | |
| 43 | Felipe Arreola# | 3.27 | 2030-2034 | |
| 43 | Shi-xian Le# | 3.27 | 2024-2034 | |
| 45 | Joe Hardy# | 3.28 | 2023-2034 | |
| 46 | David Guzman# | 3.29 | 2033-2034 | |
| 47 | Ti-an Dan# | 3.30 | 2022-2034 | |
| 48 | Tomás Bravo# | 3.31 | 2023-2034 | |
| 49 | Fred Butler | 3.32 | 2017-2030 | |
| 50 | Adhipa Vemireddy# | 3.34 | 2024-2034 | |
| 51 | Oniji Nakashima | 3.35 | 2019-2029 | |
| 52 | Rodney Armstrong | 3.38 | 2012-2024 | |
| 53 | Cohen Brouillette* | 3.39 | 2015-2028 | |
| 54 | Josuke Fujihara# | 3.40 | 2031-2034 | |
| 55 | Phoenix Smith# | 3.48 | 2022-2034 | |
| 56 | James Thompson# | 3.49 | 2025-2034 | |
| 57 | Ruberto Laranjeira | 3.52 | 2023-2031 | |
| 57 | Steve McBryde# | 3.52 | 2026-2034 | |
| 59 | Khurshid Durrani# | 3.53 | 2023-2034 | |
| 60 | Raúl Pérez | 3.55 | 2012-2021 | |
| 61 | Jose Albertrani# | 3.57 | 2026-2034 | |
| 62 | Terence McKinley | 3.61 | 2013-2023 | |
| 62 | Jack English | 3.61 | 2013-2024 | |
| 64 | Juan Luján | 3.63 | 2016-2028 | |
| 64 | Juan Mendoza# | 3.63 | 2020-2034 | |
| 66 | Bob Ruíz# | 3.64 | 2025-2034 | |
| 66 | Adrien Clément | 3.64 | 2015-2034 | |
| 68 | Ángel Ruíz# | 3.66 | 2027-2034 | |
| 68 | Pat Short | 3.66 | 2015-2026 | |
| 70 | Kent Williams# | 3.67 | 2027-2031 | |
| 70 | Ramón Castaneda | 3.67 | 2017-2028 | |
| 72 | Dylan Butlin# | 3.69 | 2025-2033 | |
| 73 | Robert Long | 3.72 | 2013-2027 | |
| 74 | Oliver Romero# | 3.74 | 2023-2034 | |
| 75 | Ijaz Kharoti# | 3.75 | 2028-2034 | |
| 76 | Pablo Cuevas | 3.78 | 2017-2029 | |
| 77 | Sotatsu Hayagawa# | 3.80 | 2019-2034 | |
| 77 | Paul Barrett# | 3.80 | 2022-2034 | |
| 77 | Manuel García | 3.80 | 2022-2028 | |
| 80 | Pedro Vazquez# | 3.82 | 2034-2034 | |
| 81 | Kirk Snyder | 3.83 | 2017-2029 | |
| 82 | Bernalldo Rocchi# | 3.86 | 2023-2034 | |
| 82 | Elmer Turner# | 3.86 | 2028-2032 | |
| 82 | Luis Mendez# | 3.86 | 2034-2034 | |
| 85 | Na'il bin Bashshar# | 3.89 | 2023-2033 | |
| 86 | Anthony Atkinson | 3.91 | 2013-2031 | |
| 87 | Max Grant | 3.94 | 2022-2032 | |
| 87 | Clayton O'Neil | 3.94 | 2016-2029 | |
| 89 | James Jostle# | 3.95 | 2030-2034 | |
| 90 | George Alexander Lewis | 3.96 | 2016-2025 | |
| 90 | Royce Butterfield | 3.96 | 2012-2019 | |
| 90 | John Bryan | 3.96 | 2015-2025 | |
| 90 | Kuniyoshi Hasegawa | 3.96 | 2021-2029 | |
| 94 | Alan Buckley | 3.97 | 2017-2029 | |
| 95 | Ray Weeks | 4.01 | 2022-2032 | |
| 96 | Iván Morales# | 4.02 | 2028-2032 | |
| 96 | Maurice Gould* | 4.02 | 2012-2030 | |
| 98 | Luis Vega# | 4.05 | 2019-2033 | |
| 98 | Elias Bowen# | 4.05 | 2026-2034 | |
| 100 | Rod Larcombe# | 4.08 | 2024-2032 |
