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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bryant Morton | 1.23 | 1979-1984 | |
| 2 | Eric Cornett | 1.28 | 1960-1962 | |
| 3 | Bob Riggs | 1.32 | 1923-1926 | |
| 4 | Luis Gonzáles | 1.34 | 1958-1961 | |
| 5 | Alonso Correa | 1.42 | 1975-1982 | |
| 6 | Manuel Hernández | 1.45 | 1955-1960 | |
| 7 | Gerald Gallon | 1.47 | 1940-1944 | |
| 7 | Hideyori Narita# | 1.47 | 1975-1990 | |
| 9 | Mario Valdéz | 1.51 | 1975-1982 | |
| 10 | Jesse O'Quinn | 1.56 | 1979-1985 | |
| 11 | Martin Southwell | 1.64 | 1975-1979 | |
| 12 | Cecil Wouters | 1.66 | 1938-1941 |
