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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Mario Guerra | 0.92 | 1995-2005 | |
| 2 | Bernaldyn Lavado | 0.94 | 1967-1976 | |
| 3 | Pancho Villalobos | 1.02 | 1995-2003 | |
| 4 | António Cruz | 1.04 | 1987-1991 | |
| 4 | Mario Rojas | 1.04 | 1966-1970 | |
| 4 | Ricardo Velásquez | 1.04 | 1971-1985 | |
| 7 | Gilberto Flores | 1.06 | 1992-2001 | |
| 7 | Steve Johnson# | 1.06 | 2009-2014 | |
| 9 | Kevin Cummins | 1.11 | 1964-1968 | |
| 9 | Félix Cruz | 1.11 | 1963-1972 | |
| 9 | José Burra | 1.11 | 1964-1973 | |
| 9 | Herbert Gibbs | 1.11 | 1957-1962 | |
| 13 | Aurelio Galindo | 1.12 | 1972-1976 | |
| 14 | Charles Walker | 1.15 | 1970-1980 | |
| 14 | Jonathan Collins | 1.15 | 1969-1977 | |
| 16 | Floyd Petersen | 1.16 | 1994-2000 | |
| 16 | Roberto González# | 1.16 | 2009-2014 | |
| 18 | Garry Robinson | 1.17 | 1970-1974 | |
| 19 | Thomas Lamm | 1.18 | 1961-1966 | |
| 20 | Michael Berry | 1.22 | 1969-1981 | |
| 21 | Joe McCay | 1.23 | 1957-1965 | |
| 22 | Tomas Solis | 1.25 | 1958-1967 | |
| 23 | Jason Griffith | 1.26 | 1967-1977 | |
| 23 | Carlos Padilla | 1.26 | 2000-2014 | |
| 25 | Craig Brown | 1.29 | 1969-1976 | |
| 26 | Andrew Hong | 1.37 | 1958-1964 | |
| 26 | Lyman Palmatier | 1.37 | 1963-1968 | |
| 28 | Robert Peterson | 1.50 | 1957-1960 | |
| 29 | Luis Reynoso | 1.53 | 1965-1969 |
