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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Won-sub Pak* | 0.85 | 1968-1983 | |
| 2 | Manuel Cline | 0.86 | 1991-2005 | |
| 3 | Dan Cooke | 0.92 | 1976-1991 | |
| 4 | Loren Herman | 0.93 | 1966-1982 | |
| 5 | Leonard Bader* | 0.95 | 1978-1999 | |
| 5 | Francisco Lucero | 0.95 | 1968-1983 | |
| 5 | Tom Holz | 0.95 | 1980-1993 | |
| 8 | Edward Whatley | 0.96 | 1997-2011 | |
| 8 | Cody Watson | 0.96 | 1981-1994 | |
| 8 | Russ Scott | 0.96 | 1976-1992 | |
| 8 | Cristo Alvarado# | 0.96 | 1999-2015 | |
| 12 | José Ortíz | 0.97 | 1995-2009 | |
| 12 | Felipe Garza* | 0.97 | 1979-1998 | |
| 12 | Curtis Graves* | 0.97 | 1978-1991 | |
| 15 | Ramón Cruz* | 0.98 | 1980-2001 | |
| 16 | John Hawkins | 0.99 | 1998-2007 | |
| 16 | Shunen Hasegawa | 0.99 | 1988-1996 | |
| 18 | Jaime Román | 1.00 | 1989-2007 | |
| 18 | Adrián Hernández | 1.00 | 1976-1991 | |
| 20 | Larry Adams# | 1.01 | 2003-2015 | |
| 20 | Bill Greene* | 1.01 | 1988-2004 | |
| 20 | Carlos Westacott | 1.01 | 1981-1996 | |
| 23 | John Wilson* | 1.02 | 1972-1989 | |
| 23 | Gonzalo Mesa | 1.02 | 1992-2004 | |
| 23 | Claude Booker | 1.02 | 1994-2007 | |
| 23 | Don Parkinson | 1.02 | 1991-2000 | |
| 23 | Cameron Miller | 1.02 | 1993-2003 | |
| 28 | Domingo Morán* | 1.03 | 1975-1989 | |
| 28 | César Hidalgo | 1.03 | 1972-1983 | |
| 30 | Reginald Lawrence* | 1.04 | 1969-1985 | |
| 30 | Gary Arsenault* | 1.04 | 1985-2003 | |
| 30 | Chris Thomas | 1.04 | 1970-1989 | |
| 33 | Bryan Hill | 1.05 | 1982-1996 | |
| 34 | Francisco Villegas | 1.06 | 1997-2012 | |
| 34 | Loren Blair | 1.06 | 2002-2014 | |
| 34 | Paco Padilla | 1.06 | 1999-2011 | |
| 34 | Javier Estrada | 1.06 | 2000-2015 | |
| 38 | Pablo Contreras* | 1.07 | 1970-1985 | |
| 38 | Bill Henderson* | 1.07 | 1978-1993 | |
| 38 | Michael Callahan | 1.07 | 1975-1994 | |
| 38 | David Eichelberger | 1.07 | 2004-2014 | |
| 38 | Jorge Romero | 1.07 | 1963-1981 | |
| 38 | Pedro Martínez | 1.07 | 1983-1992 | |
| 38 | Elijah Yates* | 1.07 | 1984-2001 | |
| 38 | Luis Reyes# | 1.07 | 2002-2015 | |
| 46 | James Thomas# | 1.08 | 2002-2015 | |
| 46 | Víctor Cosgaia | 1.08 | 1991-2005 | |
| 46 | José García | 1.08 | 1993-2006 | |
| 46 | Mark Robinson | 1.08 | 1984-1998 | |
| 46 | Julián Vélez | 1.08 | 1992-2006 | |
| 51 | Gabriel Luna | 1.09 | 2005-2011 | |
| 51 | Nate Lindsey | 1.09 | 2000-2013 | |
| 51 | Félix Velásquez | 1.09 | 1998-2010 | |
| 51 | Ramón Tristian | 1.09 | 2002-2014 | |
| 51 | Carlos García* | 1.09 | 1987-2005 | |
| 51 | Will Daniel | 1.09 | 1981-1993 | |
| 51 | José Díaz | 1.09 | 1982-1992 | |
| 51 | Tom Moore# | 1.09 | 2004-2015 | |
| 51 | Kosho Hirata | 1.09 | 1999-2008 | |
| 51 | Craig Shaw | 1.09 | 1998-2007 | |
| 61 | Julian Wood* | 1.10 | 1962-1977 | |
| 61 | Kevin Benton | 1.10 | 1987-2005 | |
| 61 | Dave Sackett# | 1.10 | 2008-2015 | |
| 61 | Carlos López | 1.10 | 1988-1998 | |
| 61 | Sergio Estrada# | 1.10 | 2007-2015 | |
| 61 | Larry Robinson | 1.10 | 1984-1999 | |
| 61 | José Sánchez | 1.10 | 1987-1998 | |
| 61 | Curt Murphy | 1.10 | 1967-1986 | |
| 69 | George Daniels | 1.11 | 1977-1992 | |
| 69 | Arturo Avilés# | 1.11 | 1998-2015 | |
| 69 | Wayne Mayfield* | 1.11 | 1982-1999 | |
| 69 | Juan Rodríguez# | 1.11 | 2000-2015 | |
| 69 | David Cote | 1.11 | 1990-2005 | |
| 69 | Eric Williams | 1.11 | 2004-2013 | |
| 69 | Jesús Garza | 1.11 | 1968-1977 | |
| 69 | Sergio Vela* | 1.11 | 1972-1996 | |
| 69 | Mike Miller | 1.11 | 2003-2013 | |
| 69 | Dan-zu Sen | 1.11 | 2003-2014 | |
| 69 | Tyson Martin | 1.11 | 1989-2000 | |
| 69 | Brian Gaines# | 1.11 | 1998-2015 | |
| 81 | Jesús Flores | 1.12 | 1986-1998 | |
| 81 | Lee Burns | 1.12 | 1985-1996 | |
| 81 | Alex Dávila# | 1.12 | 1997-2015 | |
| 81 | Jerry Emerson | 1.12 | 1996-2007 | |
| 81 | Pedro Hardy# | 1.12 | 2006-2015 | |
| 81 | Arnie Drake | 1.12 | 1997-2005 | |
| 81 | Nathan Fleming | 1.12 | 1981-1993 | |
| 81 | Félix Brito# | 1.12 | 1999-2015 | |
| 81 | Dustin Hines | 1.12 | 1995-2011 | |
| 81 | Rafael Infante# | 1.12 | 2004-2015 | |
| 81 | Pedro Romero# | 1.12 | 2002-2015 | |
| 81 | Pedro Rivera | 1.12 | 1999-2010 | |
| 93 | David Bright# | 1.13 | 2001-2015 | |
| 93 | Dan Soto* | 1.13 | 1984-2000 | |
| 93 | Alex Cummings | 1.13 | 1995-2010 | |
| 93 | Bob Kurz | 1.13 | 1985-1998 | |
| 93 | Bill Rankin | 1.13 | 2000-2012 | |
| 93 | Jason Scholey | 1.13 | 1982-1997 | |
| 93 | Ernesto Leal# | 1.13 | 2002-2015 | |
| 93 | Charlie Jackson# | 1.13 | 2008-2015 |
