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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Frank Hearn* | 1.05 | 1987-2001 | |
| 2 | Nick Dameron* | 1.06 | 2004-2019 | |
| 3 | Ernest Everhart | 1.07 | 1970-1978 | |
| 3 | David Jackson* | 1.07 | 2000-2018 | |
| 5 | Willie Thomas* | 1.08 | 1970-1983 | |
| 6 | Pedro Medellín* | 1.09 | 1997-2011 | |
| 7 | Ward Gross | 1.10 | 1970-1975 | |
| 7 | Javier García | 1.10 | 1977-1983 | |
| 7 | Michael Bowden* | 1.10 | 1980-2000 | |
| 10 | Alex Hendrix* | 1.12 | 1970-1991 | |
| 10 | Greg Parker* | 1.12 | 2002-2020 | |
| 10 | Enrico Molina | 1.12 | 1970-1981 | |
| 10 | Katsuhiko Nakamura | 1.12 | 1970-1986 | |
| 10 | Luis Delgado* | 1.12 | 1970-1988 | |
| 15 | Claude Curtis# | 1.13 | 2007-2023 | |
| 16 | Luis Altagracia* | 1.15 | 1987-2000 | |
| 16 | Víctor Rivera* | 1.15 | 1970-1987 | |
| 18 | David Bennett | 1.16 | 1975-1985 | |
| 19 | Gary Hamilton | 1.17 | 1970-1985 | |
| 19 | Tanner Frazier# | 1.17 | 2007-2023 | |
| 19 | Alex Miller* | 1.17 | 2002-2018 | |
| 19 | Nate Harris | 1.17 | 1982-1997 | |
| 19 | Randall Hutchinson# | 1.17 | 2011-2022 | |
| 19 | Paul Morgan | 1.17 | 1994-2008 | |
| 19 | José López# | 1.17 | 2010-2023 | |
| 19 | Roberto Pérez | 1.17 | 1998-2013 | |
| 19 | Adrián Torres | 1.17 | 1995-2008 | |
| 19 | Ramiro Sandoval* | 1.17 | 1970-1987 | |
| 19 | Dave McGee* | 1.17 | 2000-2017 | |
| 30 | António Serrano# | 1.18 | 2007-2023 | |
| 30 | Keith Clowes | 1.18 | 1997-2014 | |
| 30 | George Johnson* | 1.18 | 2000-2016 | |
| 30 | Will Robbins | 1.18 | 2002-2018 | |
| 30 | Kevin Sutherland | 1.18 | 1973-1986 | |
| 30 | José Santellano# | 1.18 | 2017-2023 | |
| 36 | Mal Collier* | 1.19 | 1970-1988 | |
| 36 | Barry Brown | 1.19 | 1970-1981 | |
| 36 | Ed Mills# | 1.19 | 2003-2022 | |
| 36 | Pedro Crespo | 1.19 | 2001-2015 | |
| 36 | Mohammed Koigi* | 1.19 | 1991-2005 | |
| 36 | Aaron Winter | 1.19 | 1994-2010 | |
| 42 | Forest Thomas* | 1.20 | 1970-1993 | |
| 42 | Geoff McKnight* | 1.20 | 1976-1995 | |
| 42 | Gary Olson | 1.20 | 1990-2008 | |
| 45 | Manny Carmona# | 1.21 | 2009-2023 | |
| 45 | Eric West | 1.21 | 2009-2022 | |
| 45 | Ed Rottschaefer | 1.21 | 1970-1982 | |
| 45 | Bill Fitzpatrick | 1.21 | 1990-2005 | |
| 45 | Bennie Tyler | 1.21 | 1996-2016 | |
| 45 | Dave Warren | 1.21 | 1995-2012 | |
| 45 | Gordon Henderson | 1.21 | 1999-2017 | |
| 45 | Alfredo Aguilar | 1.21 | 1998-2012 | |
| 45 | Andrew McCoy | 1.21 | 1970-1979 | |
| 54 | Karl Beatty | 1.22 | 2002-2013 | |
| 54 | Sherman Jarvis | 1.22 | 1974-1996 | |
| 54 | Pedro Macías* | 1.22 | 1995-2013 | |
| 54 | Thom Smith# | 1.22 | 2016-2023 | |
| 54 | Emílio Romano | 1.22 | 1985-2002 | |
| 54 | Dick Green | 1.22 | 1970-1991 | |
| 54 | Orlando Ramos | 1.22 | 2004-2020 | |
| 54 | Bill Byrd | 1.22 | 2007-2022 | |
| 54 | Joe Welch | 1.22 | 1977-1994 | |
| 54 | Gordon Fortner | 1.22 | 2000-2012 | |
| 54 | Brendan Baker | 1.22 | 2001-2018 | |
| 54 | Elvis Midwinter | 1.22 | 1973-1988 | |
| 66 | Stephen Johnson | 1.23 | 1970-1984 | |
| 66 | Chad Phillips | 1.23 | 2004-2021 | |
| 66 | Bill Samuels | 1.23 | 2001-2018 | |
| 66 | Matt Cox# | 1.23 | 2013-2023 | |
| 66 | Harry Andrews | 1.23 | 1996-2007 | |
| 66 | Gary Glenn | 1.23 | 2007-2022 | |
| 66 | Joaquín Hernández# | 1.23 | 2012-2023 | |
| 66 | Daniel Peña* | 1.23 | 1973-1990 | |
| 66 | José Rivas | 1.23 | 1970-1976 | |
| 66 | Dennis O'Dell | 1.23 | 2000-2016 | |
| 66 | Bob Miller# | 1.23 | 2011-2023 | |
| 66 | Pablo Mejía | 1.23 | 1981-1997 | |
| 78 | Martín Sotelo* | 1.24 | 2001-2019 | |
| 78 | Dwight Greene | 1.24 | 2006-2022 | |
| 78 | Daniel Morgan | 1.24 | 1989-1998 | |
| 78 | Ed Jackson* | 1.24 | 1992-2007 | |
| 78 | Bartolo Barrios | 1.24 | 1992-2006 | |
| 78 | Chase Miller | 1.24 | 1996-2008 | |
| 78 | Kevin Morris | 1.24 | 1987-1999 | |
| 78 | Rafael Navarro* | 1.24 | 1980-1996 | |
| 78 | Brad Schmidt | 1.24 | 1970-1984 | |
| 78 | Rich Jones | 1.24 | 1978-1988 | |
| 78 | Alfredo Torres | 1.24 | 2002-2018 | |
| 78 | Sergio García | 1.24 | 1982-1997 | |
| 78 | Dan Denton | 1.24 | 1970-1985 | |
| 91 | Tom Mitchell | 1.25 | 1976-1992 | |
| 91 | Mike Funk | 1.25 | 1979-1994 | |
| 91 | John Mills* | 1.25 | 2002-2020 | |
| 91 | Pat Schneider | 1.25 | 1970-1980 | |
| 91 | Charles Walker | 1.25 | 1970-1975 | |
| 91 | Bob Sheppard# | 1.25 | 2018-2023 | |
| 91 | Roberto Aguirre | 1.25 | 2004-2019 | |
| 91 | Daron McElroy | 1.25 | 2003-2016 | |
| 91 | Yoritoki Imai# | 1.25 | 2014-2023 | |
| 91 | José Flores | 1.25 | 1970-1977 |
