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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Jorge Flores | 0.51 | 1979-1990 | |
| 2 | Kevin Roop | 0.58 | 1970-1981 | |
| 3 | Jesús López | 0.65 | 1992-2003 | |
| 4 | Eric Speers | 0.69 | 2005-2011 | |
| 5 | Ben Taylor | 0.74 | 1996-2003 | |
| 6 | Paco Padilla | 0.82 | 1999-2011 | |
| 7 | Alfredo García# | 0.83 | 2002-2014 | |
| 8 | Juan Rodríguez# | 0.84 | 2000-2014 | |
| 8 | José Rodríguez# | 0.84 | 1998-2008 | |
| 10 | Jeff MacGregor | 0.85 | 1971-1982 | |
| 11 | Jorge Romero | 0.86 | 1963-1981 | |
| 12 | Dan Cooke | 0.87 | 1976-1991 | |
| 12 | Bill Greene* | 0.87 | 1988-2004 | |
| 14 | José Ortíz | 0.88 | 1995-2009 | |
| 15 | Garrett Olson | 0.89 | 1982-1992 | |
| 15 | David Villarreal | 0.89 | 1989-2006 | |
| 15 | Carlos Torres | 0.89 | 1981-1990 | |
| 15 | Rodney Fidge | 0.89 | 1982-1994 | |
| 15 | Rafael Randín | 0.89 | 1986-2000 | |
| 20 | Edward Whatley | 0.90 | 1997-2011 | |
| 21 | James Thomas# | 0.91 | 2002-2014 | |
| 21 | Carlos Campos | 0.91 | 1979-1992 | |
| 21 | Reginald Lawrence* | 0.91 | 1969-1985 | |
| 21 | John McNeil | 0.91 | 1970-1987 | |
| 21 | Javier Estrada# | 0.91 | 2000-2014 | |
| 26 | Bill Rankin | 0.92 | 2000-2012 | |
| 27 | Larry McMunn | 0.93 | 1973-1984 | |
| 27 | Michael Callahan | 0.93 | 1975-1994 | |
| 29 | Manuel Cline | 0.94 | 1991-2005 | |
| 29 | Eric Bell | 0.94 | 1992-2001 | |
| 31 | Cameron Miller | 0.95 | 1993-2003 | |
| 31 | Richard Bryant | 0.95 | 1981-1993 | |
| 31 | Ricardo Gutérrez | 0.95 | 2002-2012 | |
| 31 | Shunen Hasegawa | 0.95 | 1988-1996 | |
| 31 | Robert Stadler* | 0.95 | 1952-1963 | |
| 36 | Dustin Hines | 0.96 | 1995-2011 | |
| 36 | Tom Holz | 0.96 | 1980-1993 | |
| 36 | Christopher Davis | 0.96 | 1974-1988 | |
| 36 | Kevin Banks# | 0.96 | 2007-2014 | |
| 36 | Joseph Pérez | 0.96 | 1998-2010 | |
| 41 | Ramón Cruz* | 0.97 | 1980-2001 | |
| 41 | Tom Cook | 0.97 | 2001-2013 | |
| 41 | Ron Jackson | 0.97 | 1988-2001 | |
| 41 | Walt Yates | 0.97 | 1992-2006 | |
| 41 | Brad Taylor* | 0.97 | 1962-1976 | |
| 41 | Felipe Garza* | 0.97 | 1979-1998 | |
| 47 | José Crespo | 0.98 | 1980-1991 | |
| 47 | Jorge Rodríguez# | 0.98 | 2005-2014 | |
| 47 | Pablo Contreras* | 0.98 | 1970-1985 | |
| 47 | Won-sub Pak* | 0.98 | 1968-1983 | |
| 47 | Gregory Davis | 0.98 | 1976-1987 | |
| 52 | Martín Díaz | 0.99 | 1973-1983 | |
| 52 | Santiago Gómez | 0.99 | 1968-1975 | |
| 54 | Ricardo Méndez | 1.00 | 2000-2006 | |
| 54 | Raúl Mejía | 1.00 | 1968-1980 | |
| 54 | Leonard Bader* | 1.00 | 1978-1999 | |
| 57 | Rafael Pérez | 1.01 | 1992-2005 | |
| 57 | Ken Moore | 1.01 | 1979-1991 | |
| 57 | Cody Watson | 1.01 | 1981-1994 | |
| 57 | Dusty Flanagan | 1.01 | 1971-1983 | |
| 57 | John Wilson* | 1.01 | 1972-1989 | |
| 62 | Jaime Román | 1.02 | 1989-2007 | |
| 62 | José Zambrano | 1.02 | 1963-1976 | |
| 62 | César Hidalgo | 1.02 | 1972-1983 | |
| 62 | Don Parkinson | 1.02 | 1991-2000 | |
| 66 | Chris Green | 1.03 | 1972-1986 | |
| 66 | Curtis Graves* | 1.03 | 1978-1991 | |
| 66 | Gonzalo Mesa | 1.03 | 1992-2004 | |
| 69 | Greg Olivares | 1.04 | 1996-2004 | |
| 69 | William Harris | 1.04 | 1980-1993 | |
| 69 | Sam Law | 1.04 | 1983-2000 | |
| 69 | Pedro Rivera | 1.04 | 1999-2010 | |
| 69 | José Luna | 1.04 | 1970-1983 | |
| 69 | Charlie Jackson# | 1.04 | 2008-2014 | |
| 69 | Wilbur Smith | 1.04 | 1964-1979 | |
| 76 | Frank Holloway | 1.05 | 1972-1986 | |
| 76 | Julian Wood* | 1.05 | 1962-1977 | |
| 78 | Arturo Avilés# | 1.06 | 1998-2014 | |
| 78 | Ed Wardrope | 1.06 | 1966-1977 | |
| 78 | Darby Funk# | 1.06 | 1999-2012 | |
| 78 | Dallas Farmer | 1.06 | 1998-2014 | |
| 78 | Gustavo Mena | 1.06 | 1961-1974 | |
| 78 | Jamie Key | 1.06 | 1964-1976 | |
| 84 | Carlos Morales | 1.07 | 1976-1991 | |
| 84 | Julián Vélez | 1.07 | 1992-2006 | |
| 84 | Félix Medina | 1.07 | 1969-1984 | |
| 84 | Glenn Calhoun | 1.07 | 1962-1979 | |
| 84 | Dan-zu Sen# | 1.07 | 2003-2014 | |
| 84 | Marcus Hamilton | 1.07 | 1988-2003 | |
| 84 | Pedro Gabriel# | 1.07 | 2004-2014 | |
| 91 | Román Manuel | 1.08 | 1996-2009 | |
| 91 | Tim Hall | 1.08 | 1968-1979 | |
| 91 | Ernesto Leal# | 1.08 | 2002-2014 | |
| 91 | Kiyoshi Kimura | 1.08 | 1977-1988 | |
| 91 | Steve Kaufman* | 1.08 | 1968-1983 | |
| 91 | Ray Alexander# | 1.08 | 2009-2014 | |
| 91 | Ramón Tristian# | 1.08 | 2002-2014 | |
| 91 | Roberto Carera | 1.08 | 1987-2002 | |
| 99 | Harry Pettitt | 1.09 | 1952-1969 | |
| 99 | Kyle Arnold# | 1.09 | 2005-2014 |
