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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ramiro Pérez# | 0.257 | 2032-2040 | |
| 2 | Monzaemon Nakashima# | 0.571 | 2033-2040 | |
| 3 | Euan MacKinlay# | 0.736 | 2035-2037 | |
| 4 | José Mora# | 0.880 | 2033-2040 | |
| 5 | Dave Costello# | 0.957 | 2038-2038 | |
| 6 | Brian Gutiérrez# | 1.059 | 2028-2029 | |
| 7 | Kosami Suzuki# | 1.091 | 2030-2040 | |
| 8 | Juan Canó | 1.286 | 2022-2026 | |
| 9 | Jack Bourdages# | 1.296 | 2027-2032 | |
| 10 | Jorge Gómez | 1.335 | 2031-2037 | |
| 11 | Geert Neefs# | 1.734 | 2030-2040 | |
| 12 | Jorge Flores# | 1.787 | 2035-2038 | |
| 13 | José Vázquez | 1.788 | 2030-2033 | |
| 14 | José López# | 1.835 | 2036-2040 | |
| 15 | Marvin Duffy | 1.948 | 2017-2026 | |
| 16 | Norberto Vega# | 2.008 | 2026-2039 | |
| 17 | António Ayala | 2.038 | 2023-2026 | |
| 17 | Ralph Coolen# | 2.038 | 2028-2040 | |
| 19 | José Tojeira# | 2.098 | 2031-2033 | |
| 20 | George Moss# | 2.118 | 2032-2036 | |
| 21 | Ernest Baker | 2.160 | 2011-2015 | |
| 21 | Ángel Sandoval | 2.160 | 2031-2036 | |
| 23 | Jim Ball | 2.182 | 2020-2034 | |
| 24 | Ronnie Green | 2.240 | 2019-2026 | |
| 25 | Roberto Ruíz# | 2.263 | 2036-2039 | |
| 26 | Victor McKay | 2.342 | 2022-2038 | |
| 27 | Brock Barrett | 2.365 | 2015-2024 | |
| 28 | Fred Sorley | 2.400 | 2028-2037 | |
| 29 | Marvin Moore | 2.432 | 2027-2039 | |
| 30 | Manuel Ávila# | 2.434 | 2030-2039 | |
| 31 | Jack Mundy | 2.473 | 2026-2037 | |
| 32 | Jesús Luna# | 2.500 | 2031-2040 | |
| 33 | Kunisada Yasuda# | 2.507 | 2029-2040 | |
| 34 | Armando Sánchez# | 2.517 | 2037-2038 | |
| 35 | Miguel Boroa# | 2.520 | 2036-2038 | |
| 36 | Juan Santana | 2.531 | 2025-2032 | |
| 37 | Toshimichi Takahashi | 2.560 | 2021-2036 | |
| 38 | Francisco Chávez | 2.571 | 2009-2022 | |
| 38 | Jim Fish | 2.571 | 2026-2037 | |
| 40 | Teo Beerens# | 2.592 | 2038-2040 | |
| 41 | Jake Bain# | 2.613 | 2038-2038 | |
| 42 | Arinori Mochizuki | 2.621 | 2021-2032 | |
| 43 | Alfredo Zambrano | 2.641 | 2025-2030 | |
| 44 | Katai Ishikawa | 2.678 | 2015-2024 | |
| 45 | Arlen Badger# | 2.700 | 2027-2036 | |
| 45 | Daichi Chishu# | 2.700 | 2028-2040 | |
| 45 | Jimmy Reynolds# | 2.700 | 2036-2039 | |
| 48 | Hayato Kobayashi | 2.725 | 2022-2033 | |
| 49 | Naozane Sakai# | 2.730 | 2026-2040 | |
| 50 | Shang-de Li# | 2.755 | 2032-2040 | |
| 51 | Ray Graham | 2.802 | 2015-2019 | |
| 52 | Darren Jackson | 2.808 | 2023-2033 | |
| 53 | Eli McKnight | 2.812 | 2030-2033 | |
| 54 | Hayato Kawano | 2.827 | 2024-2038 | |
| 55 | Avery Carson | 2.831 | 2015-2026 | |
| 56 | Phil Anderson | 2.842 | 2014-2026 | |
| 56 | Meles Wookey# | 2.842 | 2036-2037 | |
| 58 | José Flores# | 2.887 | 2035-2036 | |
| 59 | James Jordan | 2.945 | 2020-2028 | |
| 60 | Eric Madelen | 2.956 | 2017-2026 | |
| 61 | Jack Ring# | 2.970 | 2036-2040 | |
| 61 | Santiago Sandoval# | 2.970 | 2034-2036 | |
| 63 | Kevin Gallegos | 2.983 | 2029-2039 | |
| 64 | David Barton | 3.000 | 2016-2024 | |
| 64 | Germán Durango# | 3.000 | 2027-2040 | |
| 66 | Sebastiaan de Roode# | 3.021 | 2034-2040 | |
| 66 | Eric Perkins | 3.021 | 2019-2024 | |
| 68 | Mike Morgan | 3.028 | 2028-2032 | |
| 69 | Pedro Marquis | 3.051 | 2028-2037 | |
| 70 | Ed Madison | 3.135 | 2019-2030 | |
| 71 | Carlos Macías | 3.146 | 2024-2030 | |
| 72 | César León | 3.176 | 2021-2034 | |
| 73 | António Vega | 3.240 | 2022-2034 | |
| 74 | Greg Abutin# | 3.375 | 2033-2040 | |
| 75 | Pedro Solíz# | 3.403 | 2029-2040 | |
| 76 | Silvio Bolt | 3.416 | 2029-2039 | |
| 77 | Colin Hopps | 3.436 | 2029-2030 | |
| 78 | Manuel Serrano | 3.469 | 2030-2038 | |
| 79 | Yajirobei Matsunaga# | 3.491 | 2034-2037 | |
| 80 | Daan Mastenbroek# | 3.510 | 2038-2040 | |
| 81 | Seiichi Sakaguchi# | 3.541 | 2034-2040 | |
| 82 | Ryan Miner | 3.560 | 2019-2025 | |
| 83 | James MacQuistan# | 3.649 | 2027-2040 | |
| 84 | Juan Jose Patino | 3.706 | 2025-2038 | |
| 85 | Manuel Barrios# | 3.762 | 2023-2038 | |
| 86 | Lateef Kamomba | 3.925 | 2025-2035 | |
| 87 | Mal Cooper# | 4.000 | 2033-2040 | |
| 88 | José Avalos | 4.021 | 2014-2020 | |
| 89 | Kevin Hollins | 4.050 | 2009-2016 | |
| 90 | Seong-chae Somun# | 4.091 | 2030-2040 | |
| 91 | Bob Witney | 4.109 | 2022-2028 | |
| 92 | Ryutaro Nakano | 4.114 | 2026-2038 | |
| 93 | Héctor Ventura# | 4.119 | 2034-2040 | |
| 94 | Gonçalo Doroteia | 4.154 | 2020-2023 | |
| 95 | Bill Evans# | 4.219 | 2038-2039 | |
| 95 | Lance Harris# | 4.219 | 2026-2037 | |
| 97 | Steve Major | 4.226 | 2019-2027 | |
| 98 | Edgardo Rojas | 4.309 | 2017-2023 | |
| 99 | César Hernández | 4.339 | 2017-2022 | |
| 100 | Alfonso Villalobos | 4.404 | 2028-2036 |
