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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 | Marnix van Rijn# | 2.146 | 2032 | |
| 5 | Brian Walker# | 2.238 | 2028 | |
| 6 | Curt Tate | 2.301 | 2024 | |
| 7 | John Boyle | 2.334 | 2024 | |
| 8 | Luis Ortíz | 2.338 | 2025 | |
| 9 | Norberto Concepción# | 2.390 | 2029 | |
| 10 | Barney Starr# | 2.412 | 2028 | |
| 11 | Santo Velazco# | 2.418 | 2028 | |
| 12 | John Ball# | 2.438 | 2027 | |
| 13 | Carlos Pérez | 2.455 | 2022 | |
| 14 | Montrell Baxa# | 2.537 | 2032 | |
| 15 | Johnnie Bough# | 2.557 | 2032 | |
| 16 | Tony DeWitt# | 2.563 | 2030 | |
| 17 | Rob Silva# | 2.569 | 2026 | |
| 18 | Shotaro Sugahara# | 2.581 | 2028 | |
| 19 | Daniel Lavalley# | 2.593 | 2032 | |
| 20 | Osvaldo Garibe# | 2.598 | 2029 | |
| 21 | Miguel Aguilar# | 2.627 | 2025 | |
| 22 | Paco Manuel# | 2.646 | 2028 | |
| 23 | Mark Walker | 2.653 | 2023 | |
| 24 | Norberto Quintana# | 2.657 | 2024 | |
| 25 | Loeck Visser# | 2.667 | 2026 | |
| 26 | Pedro Reynoso# | 2.700 | 2030 | |
| 27 | Manuel Delgado | 2.718 | 2021 | |
| 28 | Jorge Carrión | 2.730 | 2025 | |
| 28 | Travis Grant# | 2.730 | 2023 | |
| 30 | Steve Seabolt# | 2.771 | 2030 | |
| 31 | Roberto Cantú | 2.775 | 2023 | |
| 32 | Marv Bradford# | 2.785 | 2025 | |
| 33 | Logan Gregory# | 2.786 | 2023 | |
| 34 | Melvin Tiburcio# | 2.788 | 2031 | |
| 35 | Will Moore# | 2.793 | 2028 | |
| 36 | Anatoly Ivanovich# | 2.795 | 2027 | |
| 37 | Cobus Reijnen# | 2.806 | 2027 | |
| 37 | Ryunosuke Kurota# | 2.806 | 2032 | |
| 39 | Juan Parales# | 2.848 | 2031 | |
| 40 | Carlos Salcido# | 2.849 | 2031 | |
| 41 | Hirokichi Kichida | 2.860 | 2019 | |
| 42 | Pat Horton | 2.869 | 2022 | |
| 43 | Doruk Oyan | 2.872 | 2022 | |
| 44 | Michael Logan | 2.886 | 2026 | |
| 45 | Paul Stuart | 2.893 | 2020 | |
| 45 | Bartolo Medina | 2.893 | 2025 | |
| 47 | Kevin Samuels# | 2.896 | 2027 | |
| 48 | Octávio Ríos# | 2.916 | 2025 | |
| 49 | Jorge Carrión | 2.917 | 2024 | |
| 49 | Osiris St. Brown# | 2.917 | 2033 | |
| 51 | Phil Miller | 2.919 | 2028 | |
| 52 | Gerald Bolton# | 2.928 | 2031 | |
| 53 | Jack King | 2.938 | 2025 | |
| 54 | Vincent O'Higgin# | 2.948 | 2033 | |
| 55 | Earl Simmons# | 2.951 | 2026 | |
| 56 | Mike Brandner# | 2.952 | 2029 | |
| 57 | Héctor Silva | 2.962 | 2025 | |
| 58 | Kyuichi Hori# | 2.970 | 2029 | |
| 59 | Allen Yohemas# | 2.984 | 2021 | |
| 59 | Gabriel Hernández | 2.984 | 2023 | |
| 61 | Carlos Méndez | 2.987 | 2020 | |
| 62 | Cisco Pérez# | 3.007 | 2032 | |
| 63 | Santiago López# | 3.022 | 2028 | |
| 63 | Damien Scudder# | 3.022 | 2026 | |
| 65 | Enrique Mateo# | 3.029 | 2033 | |
| 66 | Michael Taylor# | 3.037 | 2026 | |
| 67 | Luis Castrejón# | 3.058 | 2027 | |
| 68 | Francisco Martínez | 3.059 | 2025 | |
| 69 | Dan Crowder# | 3.066 | 2025 | |
| 70 | César González | 3.067 | 2024 | |
| 71 | Pat Hunt | 3.076 | 2023 | |
| 72 | John Ball# | 3.084 | 2026 | |
| 73 | Maxime Janssens# | 3.087 | 2027 | |
| 74 | Santo Velazco# | 3.100 | 2029 | |
| 75 | Steve Adkins | 3.105 | 2024 | |
| 76 | Hercules Mata'afa# | 3.108 | 2033 | |
| 77 | Pedro Tavárez# | 3.119 | 2033 | |
| 78 | Mack MacDonald# | 3.121 | 2026 | |
| 79 | Blair Wright# | 3.131 | 2032 | |
| 80 | Ray Mangas# | 3.151 | 2027 | |
| 81 | Roger Rodenburg# | 3.156 | 2033 | |
| 82 | Andrés Quezada# | 3.163 | 2025 | |
| 83 | Mike Brandner# | 3.165 | 2028 | |
| 84 | Santiago López# | 3.171 | 2026 | |
| 85 | Luis Ortíz | 3.173 | 2026 | |
| 86 | Carlos Hernández | 3.184 | 2021 | |
| 87 | Stewart Fleming# | 3.185 | 2026 | |
| 88 | Don Cantrell# | 3.192 | 2032 | |
| 88 | Roosevelt Guimond | 3.192 | 2028 | |
| 90 | Jeff Merritt# | 3.193 | 2031 | |
| 91 | Wes Hamm# | 3.194 | 2020 | |
| 91 | Rusty Maxson# | 3.194 | 2029 | |
| 93 | Cal Haber# | 3.196 | 2026 | |
| 94 | Ollie McDaniell# | 3.197 | 2031 | |
| 95 | Phil Miller | 3.199 | 2026 | |
| 96 | Rafael Chávez | 3.237 | 2018 | |
| 97 | Aurelio López# | 3.238 | 2020 | |
| 98 | Mike Foltynewicz# | 3.271 | 2028 | |
| 99 | Ramón Castaneda | 3.275 | 2026 | |
| 100 | Paco Peńa | 3.285 | 2024 |
