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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Junior Castillo | 0.64 | 2014-2032 | |
| 2 | Walt Porter# | 0.73 | 2027-2041 | |
| 3 | Alberto Caballero# | 0.74 | 2036-2041 | |
| 4 | Héctor Pinto | 0.76 | 2012-2013 | |
| 5 | Gabriel Gutiérrez | 0.79 | 2011-2020 | |
| 6 | Emílio García# | 0.85 | 2040-2041 | |
| 7 | Koto Sekiguchi | 0.87 | 2019-2020 | |
| 7 | Ángel Valdéz | 0.87 | 2017-2026 | |
| 9 | Mal Benton | 0.88 | 2017-2029 | |
| 10 | Pedro Chávez | 0.93 | 2013-2013 | |
| 11 | George Haines | 0.95 | 2019-2020 | |
| 12 | Joe Rivera | 0.98 | 2029-2038 | |
| 13 | Jason Meléndez# | 0.99 | 2037-2041 | |
| 14 | Gustavo Luján# | 1.01 | 2029-2040 | |
| 15 | Alonso Flores# | 1.02 | 2030-2041 | |
| 15 | José Santos | 1.02 | 2012-2026 | |
| 15 | Juan Flores | 1.02 | 2012-2021 | |
| 18 | Miguel Cordero# | 1.03 | 2027-2041 | |
| 19 | Carlton Minor# | 1.04 | 2027-2041 | |
| 20 | Jesús Salazar# | 1.05 | 2036-2041 | |
| 21 | Arturo Ramírez | 1.06 | 2013-2029 | |
| 21 | Javier Gómez | 1.06 | 2014-2025 | |
| 23 | Jerry Collins | 1.07 | 2007-2024 | |
| 23 | Xavier González | 1.07 | 2014-2036 | |
| 23 | Nathan Barton | 1.07 | 2015-2020 | |
| 23 | José Flores | 1.07 | 2027-2029 | |
| 23 | Jorge Alou | 1.07 | 2021-2039 | |
| 28 | Eiichi Nakao | 1.08 | 2010-2020 | |
| 28 | Manuel Piñal# | 1.08 | 2032-2041 | |
| 28 | Tomás Esparza | 1.08 | 2012-2039 | |
| 28 | Ken Martínez# | 1.08 | 2031-2041 | |
| 32 | Eduardo Camacho# | 1.11 | 2027-2041 | |
| 33 | Juan Martínez | 1.12 | 2012-2025 | |
| 33 | Luis Cantú | 1.12 | 2022-2027 | |
| 35 | Manuel Ávila# | 1.13 | 2021-2041 | |
| 36 | Ron Gómez# | 1.14 | 2024-2041 | |
| 36 | Clark Vallés# | 1.14 | 2029-2041 | |
| 38 | Pedro Concepción | 1.16 | 2018-2020 | |
| 38 | José Méndez | 1.16 | 2012-2025 | |
| 38 | Humberto Hernández# | 1.16 | 2035-2041 | |
| 41 | Juan Gonzáles | 1.17 | 2023-2040 | |
| 41 | José López | 1.17 | 2009-2018 | |
| 43 | Alfredo García | 1.18 | 2015-2028 | |
| 43 | Johnny MacKinney | 1.18 | 2017-2020 | |
| 43 | Tony Salazar# | 1.18 | 2029-2041 | |
| 43 | Jesús Cantú | 1.18 | 2019-2040 | |
| 47 | Gary Edwards | 1.19 | 2009-2018 | |
| 48 | Jorge Valentín | 1.20 | 2030-2040 | |
| 49 | José Gonzáles# | 1.21 | 2027-2041 | |
| 50 | Ángel López# | 1.22 | 2031-2041 | |
| 51 | Fred Negrón | 1.23 | 2013-2015 | |
| 52 | Juan Alvarado | 1.24 | 2019-2038 | |
| 53 | Rafael Salas# | 1.27 | 2023-2041 | |
| 54 | António Rodríguez# | 1.29 | 2028-2041 | |
| 55 | Martín Martínez# | 1.30 | 2028-2041 | |
| 56 | Diego Perales | 1.32 | 2011-2012 | |
| 57 | Martin Rodríguez# | 1.33 | 2034-2041 | |
| 58 | Domingo Pérez# | 1.34 | 2036-2041 | |
| 59 | Cristián Básquez | 1.36 | 2007-2009 | |
| 60 | Fernando Vásquez# | 1.37 | 2030-2041 | |
| 61 | Jay Black# | 1.43 | 2021-2041 | |
| 61 | David López | 1.43 | 2014-2037 | |
| 63 | Jerome Beaton | 1.44 | 2007-2013 | |
| 64 | Jorge Escamilla# | 1.47 | 2025-2041 | |
| 64 | Emílio Alvarado | 1.47 | 2007-2012 | |
| 66 | José Rodríguez | 1.48 | 2028-2037 | |
| 67 | Rafael Quintero | 1.49 | 2027-2035 | |
| 68 | Juan Román | 1.50 | 2014-2024 | |
| 69 | César Rodríguez | 1.53 | 2007-2011 | |
| 70 | Juan Olivares | 1.54 | 2007-2010 | |
| 71 | Dave Smith | 1.56 | 2009-2012 | |
| 72 | Juan Romo# | 1.64 | 2034-2041 | |
| 73 | Kevin Orozco# | 1.66 | 2028-2041 | |
| 74 | Tomás Baldomado# | 1.73 | 2031-2041 | |
| 75 | Armando Rodríguez# | 1.95 | 2030-2041 |
