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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Micah Burridge | 1.22 | 1948-1949 | |
| 2 | Ernesto Caboverde | 1.27 | 1947-1950 | |
| 3 | Jong-beom Paek | 1.54 | 1933-1936 | |
| 3 | Enrique Barrios* | 1.54 | 1941-1943 | |
| 3 | Jimmy Simons | 1.54 | 1940-1942 | |
| 6 | Borek Jerksak | 1.59 | 1937-1947 | |
| 7 | Don Lord | 1.61 | 1975-1981 | |
| 8 | Jesús Rentería# | 1.63 | 1979-1984 | |
| 9 | William Piper | 1.65 | 1953-1957 | |
| 10 | Ed Carpenter | 1.66 | 1955-1960 | |
| 11 | Jorge Valdés | 1.67 | 1934-1936 | |
| 12 | Brian Buck | 1.69 | 1966-1971 | |
| 13 | Clement Wallace | 1.71 | 1943-1945 | |
| 13 | Ryan Howe | 1.71 | 1978-1982 | |
| 15 | Alonso Zumaya | 1.76 | 1978-1985 | |
| 16 | Esteban Méndez | 1.79 | 1970-1974 | |
| 16 | Orlando Guillén | 1.79 | 1977-1985 | |
| 18 | Javier Hernández# | 1.84 | 1983-1990 | |
| 19 | Gustavo Mercado | 1.85 | 1960-1966 | |
| 20 | Jason Retter# | 1.87 | 1975-1990 | |
| 21 | Tony Moura# | 1.94 | 1983-1988 | |
| 22 | Jing-xiang Woo# | 1.99 | 1982-1989 |
