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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jesús Hernández# | 1.713 | 2027 | |
| 2 | Emílio Mavarro# | 1.833 | 2028 | |
| 3 | Norberto Concepción# | 1.950 | 2030 | |
| 4 | Brian Walker# | 2.238 | 2028 | |
| 5 | Curt Tate | 2.301 | 2024 | |
| 6 | John Boyle | 2.334 | 2024 | |
| 7 | Luis Ortíz# | 2.338 | 2025 | |
| 8 | Norberto Concepción# | 2.390 | 2029 | |
| 9 | Barney Starr# | 2.412 | 2028 | |
| 10 | Santo Velazco# | 2.418 | 2028 | |
| 11 | John Ball# | 2.438 | 2027 | |
| 12 | Carlos Pérez | 2.455 | 2022 | |
| 13 | Tony DeWitt# | 2.563 | 2030 | |
| 14 | Rob Silva# | 2.569 | 2026 | |
| 15 | Shotaro Sugahara# | 2.581 | 2028 | |
| 16 | Osvaldo Garibe# | 2.598 | 2029 | |
| 17 | Miguel Aguilar# | 2.627 | 2025 | |
| 18 | Paco Manuel# | 2.646 | 2028 | |
| 19 | Mark Walker | 2.653 | 2023 | |
| 20 | Norberto Quintana# | 2.657 | 2024 | |
| 21 | Loeck Visser# | 2.667 | 2026 | |
| 22 | Pedro Reynoso# | 2.700 | 2030 | |
| 23 | Manuel Delgado | 2.718 | 2021 | |
| 24 | Travis Grant# | 2.730 | 2023 | |
| 24 | Jorge Carrión# | 2.730 | 2025 | |
| 26 | Steve Seabolt# | 2.771 | 2030 | |
| 27 | Roberto Cantú# | 2.775 | 2023 | |
| 28 | Marv Bradford# | 2.785 | 2025 | |
| 29 | Logan Gregory# | 2.786 | 2023 | |
| 30 | Melvin Tiburcio# | 2.788 | 2031 | |
| 31 | Will Moore# | 2.793 | 2028 | |
| 32 | Anatoly Ivanovich# | 2.795 | 2027 | |
| 33 | Cobus Reijnen# | 2.806 | 2027 | |
| 34 | Juan Parales# | 2.848 | 2031 | |
| 35 | Carlos Salcido# | 2.849 | 2031 | |
| 36 | Hirokichi Kichida | 2.860 | 2019 | |
| 37 | Pat Horton | 2.869 | 2022 | |
| 38 | Doruk Oyan | 2.872 | 2022 | |
| 39 | Michael Logan | 2.886 | 2026 | |
| 40 | Bartolo Medina | 2.893 | 2025 | |
| 40 | Paul Stuart | 2.893 | 2020 | |
| 42 | Kevin Samuels# | 2.896 | 2027 | |
| 43 | Octávio Ríos# | 2.916 | 2025 | |
| 44 | Jorge Carrión# | 2.917 | 2024 | |
| 45 | Phil Miller# | 2.919 | 2028 | |
| 46 | Gerald Bolton# | 2.928 | 2031 | |
| 47 | Jack King | 2.938 | 2025 | |
| 48 | Earl Simmons# | 2.951 | 2026 | |
| 49 | Mike Brandner# | 2.952 | 2029 | |
| 50 | Héctor Silva | 2.962 | 2025 | |
| 51 | Kyuichi Hori# | 2.970 | 2029 | |
| 52 | Allen Yohemas# | 2.984 | 2021 | |
| 52 | Gabriel Hernández# | 2.984 | 2023 | |
| 54 | Carlos Méndez | 2.987 | 2020 | |
| 55 | Santiago López# | 3.022 | 2028 | |
| 55 | Damien Scudder# | 3.022 | 2026 | |
| 57 | Michael Taylor# | 3.037 | 2026 | |
| 58 | Luis Castrejón# | 3.058 | 2027 | |
| 59 | Francisco Martínez | 3.059 | 2025 | |
| 60 | Dan Crowder# | 3.066 | 2025 | |
| 61 | César González | 3.067 | 2024 | |
| 62 | Pat Hunt | 3.076 | 2023 | |
| 63 | John Ball# | 3.084 | 2026 | |
| 64 | Maxime Janssens# | 3.087 | 2027 | |
| 65 | Santo Velazco# | 3.100 | 2029 | |
| 66 | Steve Adkins | 3.105 | 2024 | |
| 67 | Mack MacDonald# | 3.121 | 2026 | |
| 68 | Ray Mangas# | 3.151 | 2027 | |
| 69 | Andrés Quezada# | 3.163 | 2025 | |
| 70 | Mike Brandner# | 3.165 | 2028 | |
| 71 | Santiago López# | 3.171 | 2026 | |
| 72 | Luis Ortíz# | 3.173 | 2026 | |
| 73 | Carlos Hernández | 3.184 | 2021 | |
| 74 | Stewart Fleming# | 3.185 | 2026 | |
| 75 | Roosevelt Guimond# | 3.192 | 2028 | |
| 76 | Jeff Merritt# | 3.193 | 2031 | |
| 77 | Wes Hamm# | 3.194 | 2020 | |
| 77 | Rusty Maxson# | 3.194 | 2029 | |
| 79 | Cal Haber# | 3.196 | 2026 | |
| 80 | Ollie McDaniell# | 3.197 | 2031 | |
| 81 | Phil Miller# | 3.199 | 2026 | |
| 82 | Rafael Chávez | 3.237 | 2018 | |
| 83 | Aurelio López# | 3.238 | 2020 | |
| 84 | Mike Foltynewicz# | 3.271 | 2028 | |
| 85 | Ramón Castaneda | 3.275 | 2026 | |
| 86 | Paco Peńa | 3.285 | 2024 | |
| 87 | Shawn Arnold# | 3.289 | 2020 | |
| 88 | Stanley Williams | 3.304 | 2018 | |
| 89 | Pat Hunt | 3.309 | 2022 | |
| 90 | César Galló# | 3.312 | 2021 | |
| 91 | Ryunosuke Kurota# | 3.313 | 2031 | |
| 92 | Rob Stone# | 3.330 | 2020 | |
| 93 | Naozane Kobayashi# | 3.331 | 2030 | |
| 94 | Robbie Baxter# | 3.355 | 2021 | |
| 95 | Doruk Oyan | 3.375 | 2020 | |
| 95 | Leif Mayer# | 3.375 | 2025 | |
| 97 | David Cole | 3.382 | 2021 | |
| 98 | Sergio Zamora# | 3.384 | 2030 | |
| 99 | Jorge Cruz# | 3.385 | 2028 | |
| 100 | Pat Hunt | 3.396 | 2025 |
