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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Juan Vado | 0.97 | 2039-2050 | |
| 2 | Augusto Villarreal | 1.10 | 2038-2053 | |
| 3 | Emílio Pérez | 1.12 | 2038-2046 | |
| 4 | Ron Cameron | 1.15 | 2037-2044 | |
| 4 | Jack Sellers | 1.15 | 1997-2007 | |
| 6 | José Martínez | 1.18 | 2003-2008 | |
| 7 | Juan Jose Morán | 1.19 | 2040-2047 | |
| 8 | Theophilus Markoullides# | 1.20 | 2051-2056 | |
| 9 | Millard Bell | 1.21 | 1995-2008 | |
| 9 | António Téllez | 1.21 | 2036-2044 | |
| 9 | Pete Hulett# | 1.21 | 2055-2060 | |
| 12 | Esteban De La Cruz | 1.22 | 1996-2007 | |
| 13 | Ryan Wilson | 1.24 | 2037-2043 | |
| 14 | José Montoya | 1.25 | 2039-2054 | |
| 15 | Trent Barrett | 1.26 | 2048-2053 | |
| 16 | Marc Pierson | 1.27 | 1999-2007 | |
| 16 | Ralph Leslie | 1.27 | 1995-2001 | |
| 18 | Ambrose McCoy | 1.28 | 1996-2002 | |
| 19 | Tsukasa Kumagai | 1.30 | 2042-2048 | |
| 19 | Gilberto García | 1.30 | 1996-2001 | |
| 19 | António Jiménez | 1.30 | 2002-2006 | |
| 22 | Danny Harrell | 1.35 | 2002-2007 | |
| 22 | Logan Williams | 1.35 | 2052-2057 | |
| 24 | Hamilton Bayless | 1.37 | 1997-2007 | |
| 24 | Gabriel Hinton | 1.37 | 2003-2011 | |
| 24 | Manuel Herrera | 1.37 | 2036-2045 | |
| 27 | Lee Brown | 1.38 | 1995-2000 | |
| 28 | Willie Peters | 1.40 | 2016-2023 | |
| 28 | José Garza | 1.40 | 1995-2002 | |
| 30 | Raúl Portillo | 1.41 | 2038-2043 | |
| 31 | Carlos Velasco | 1.46 | 2036-2048 | |
| 32 | Christopher Barker | 1.47 | 2043-2052 | |
| 33 | Juan Rodríguez | 1.48 | 2044-2052 | |
| 34 | Deron Evans# | 1.50 | 2055-2061 | |
| 35 | Eduardo Vázquez | 1.51 | 2040-2049 | |
| 36 | Timothy Swain | 1.55 | 2049-2053 | |
| 37 | Mehari Jitu | 1.73 | 2040-2052 |
