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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Rafael Vázquez | 1.380 | 2000 | |
| 2 | Jack Luna | 1.706 | 2028 | |
| 3 | Felipe Soto | 1.744 | 2020 | |
| 4 | Michael Strathallan* | 1.786 | 2005 | |
| 5 | Miguel Aguirre | 1.807 | 2017 | |
| 6 | Aaron Miller | 1.829 | 2005 | |
| 7 | Jay Chapman# | 1.851 | 2047 | |
| 8 | Dan O'Manning | 1.889 | 2030 | |
| 9 | Cedric Ayers | 1.905 | 2001 | |
| 10 | Kevin Upson | 1.936 | 1998 | |
| 11 | Eric Peet | 1.947 | 2005 | |
| 12 | Marvin Smith | 1.959 | 2009 | |
| 13 | Pacio Bidet | 1.985 | 2019 | |
| 14 | Doc Windgate | 1.997 | 1995 | |
| 15 | Denis Charette | 1.998 | 2004 | |
| 16 | Al Hall | 2.016 | 2009 | |
| 17 | Buddy Reda | 2.024 | 1995 | |
| 18 | José Lara | 2.025 | 2004 | |
| 19 | Arthur Wiggins | 2.032 | 2005 | |
| 20 | Francisco Rosário# | 2.035 | 2058 | |
| 21 | Reynaldo Limón | 2.061 | 2025 | |
| 22 | Rob Shelton# | 2.062 | 2056 | |
| 23 | José Romero | 2.068 | 2019 | |
| 24 | Nacho Martínez | 2.080 | 2002 | |
| 25 | Kit Venizelos# | 2.085 | 2057 | |
| 26 | Lanny MacFadden | 2.098 | 2018 | |
| 27 | Rodrigo Vásquez | 2.133 | 2007 | |
| 28 | Carlos Olivas# | 2.135 | 2047 | |
| 29 | Dave Hebert# | 2.149 | 2051 | |
| 30 | Natsuo Kono# | 2.150 | 2054 | |
| 30 | Víctor López | 2.150 | 2017 | |
| 32 | Anastasio Quintana | 2.160 | 2023 | |
| 33 | Tim Carlson | 2.169 | 2004 | |
| 34 | Emílio López | 2.172 | 2038 | |
| 35 | Arthur Wiggins | 2.180 | 2006 | |
| 36 | Samuel Sieg | 2.181 | 1997 | |
| 37 | Pedro Berroa | 2.189 | 2025 | |
| 38 | Benjamin Canao | 2.194 | 1999 | |
| 39 | Jesús Gonzáles | 2.198 | 2022 | |
| 40 | Victor Morales | 2.212 | 1996 | |
| 41 | Raúl Moreno | 2.217 | 2044 | |
| 42 | Delbert Negrin | 2.219 | 1998 | |
| 43 | Ben Wade | 2.220 | 2019 | |
| 44 | Jesús Durán | 2.221 | 2016 | |
| 45 | Joe Perry | 2.228 | 2010 | |
| 46 | Will Emery | 2.238 | 2005 | |
| 47 | Ed Cox | 2.239 | 2054 | |
| 47 | Bobby Maxwell# | 2.239 | 2055 | |
| 49 | Rich Kernodle | 2.244 | 2002 | |
| 50 | Herbert Coolen | 2.254 | 2004 | |
| 51 | Clint Babbitt | 2.271 | 2015 | |
| 52 | Damaso Izaguirre | 2.288 | 2001 | |
| 53 | Pablo Figueroa | 2.297 | 2028 | |
| 53 | Martín Flores | 2.297 | 2027 | |
| 55 | Lúcio Mendoza | 2.298 | 2040 | |
| 55 | Hercules Argos# | 2.298 | 2057 | |
| 57 | Buster Mali | 2.301 | 1999 | |
| 58 | Martín Garza | 2.302 | 2006 | |
| 59 | Tom Williams | 2.308 | 2026 | |
| 60 | Cletus Bullrush, Jr. | 2.312 | 1996 | |
| 61 | Randy Wood | 2.330 | 2024 | |
| 62 | Fernando Vázquez | 2.356 | 2040 | |
| 63 | Shawn Abrams | 2.358 | 2009 | |
| 64 | Gilberto Cabrera | 2.360 | 2015 | |
| 65 | Pedro Salduar | 2.365 | 2036 | |
| 66 | Ghi-cheng Yu# | 2.367 | 2054 | |
| 67 | Pete Decker | 2.370 | 2002 | |
| 68 | Kevin Brodeur | 2.372 | 2002 | |
| 69 | Mickey Carson | 2.374 | 2014 | |
| 70 | Esteban Rivera | 2.378 | 2017 | |
| 71 | David Daniel | 2.381 | 2002 | |
| 72 | Álex López | 2.386 | 2025 | |
| 73 | Jorge Cintrón | 2.392 | 2027 | |
| 74 | Assi Rubanza | 2.397 | 2006 | |
| 75 | Derrek Terry | 2.401 | 2034 | |
| 76 | Joseph Hartman# | 2.402 | 2056 | |
| 77 | Tom Jimerson | 2.405 | 1998 | |
| 77 | Phil Johnson | 2.405 | 2016 | |
| 77 | Umeshirou Sojuro | 2.405 | 2000 | |
| 80 | Todd Demko | 2.406 | 2004 | |
| 81 | Barney Mills | 2.418 | 2016 | |
| 82 | Omar Sosa | 2.421 | 2017 | |
| 83 | Sean Farrell | 2.429 | 1999 | |
| 84 | Roger White | 2.430 | 2002 | |
| 85 | Jeff Wills# | 2.432 | 2053 | |
| 86 | John Alvarez | 2.433 | 1999 | |
| 87 | Elton Robinson | 2.434 | 2018 | |
| 88 | Sergio Rojas# | 2.438 | 2058 | |
| 88 | Toby Murdock | 2.438 | 1999 | |
| 90 | Makin bin Isma'il# | 2.439 | 2050 | |
| 91 | Júlio Martínez | 2.441 | 2017 | |
| 92 | Brian Whitford# | 2.447 | 2058 | |
| 93 | Paul Miller | 2.449 | 2008 | |
| 94 | Chris Allen | 2.455 | 2002 | |
| 94 | Joe Kern | 2.455 | 2010 | |
| 96 | John Ericks | 2.459 | 2002 | |
| 97 | Michael McBean | 2.463 | 2002 | |
| 98 | Christian Jordan# | 2.471 | 2051 | |
| 99 | Maxwell Johnson | 2.474 | 2002 | |
| 100 | Morton Barnett | 2.477 | 2002 |
