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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Loflinger Arrau | 1.29 | 1934-1939 | |
| 2 | Kevin Engler | 1.31 | 1912-1916 | |
| 3 | Duane Stewart | 1.32 | 1974-1982 | |
| 4 | Kent Marriott | 1.33 | 1940-1945 | |
| 5 | Rafael Ortíz | 1.34 | 1911-1918 | |
| 6 | César Valle# | 1.35 | 1977-1991 | |
| 7 | Héctor Valdéz | 1.38 | 1932-1940 | |
| 8 | Brad Lew | 1.39 | 1935-1941 | |
| 9 | Bill White | 1.40 | 1939-1941 | |
| 9 | Tommy Davis | 1.40 | 1967-1974 | |
| 11 | John McGill | 1.42 | 1972-1978 | |
| 12 | Paco Serrano | 1.45 | 1921-1925 | |
| 12 | Bobby Meyers | 1.45 | 1936-1941 | |
| 12 | Bob Brandon | 1.45 | 1917-1922 | |
| 15 | Jack Ashley | 1.47 | 1963-1971 | |
| 16 | Tim Spence | 1.49 | 1946-1949 | |
| 16 | Roberto Luna# | 1.49 | 1982-1991 | |
| 18 | António López | 1.50 | 1932-1935 | |
| 18 | Barney Sherman | 1.50 | 1958-1965 | |
| 18 | Ernesto Caboverde | 1.50 | 1952-1955 | |
| 21 | Jimmy Lamb | 1.51 | 1940-1948 | |
| 21 | Octávio Luna | 1.51 | 1981-1989 | |
| 23 | Tony Price | 1.54 | 1921-1924 | |
| 23 | Luis Guillén | 1.54 | 1975-1980 | |
| 25 | Kirby Walters | 1.59 | 1932-1937 | |
| 25 | Jasper Willis | 1.59 | 1948-1952 | |
| 27 | Alexander DeYoung | 1.60 | 1936-1943 | |
| 28 | Cliff Spronk | 1.61 | 1958-1961 | |
| 28 | Alan Rivers | 1.61 | 1941-1945 | |
| 30 | Orlando García | 1.62 | 1938-1948 | |
| 31 | José Nájera | 1.64 | 1927-1938 | |
| 31 | Darren Cargeeg | 1.64 | 1936-1940 | |
| 33 | Jimmy Parker | 1.65 | 1979-1985 | |
| 34 | Leonardo Zamora | 1.66 | 1949-1953 | |
| 35 | Lambert Schreiner | 1.69 | 1980-1990 | |
| 36 | Jerome Broadley | 1.72 | 1946-1955 | |
| 37 | Plácido Gutiérrez | 1.75 | 1955-1961 | |
| 38 | Javier Balderas | 1.77 | 1961-1974 | |
| 39 | Jorge Martínez | 1.83 | 1953-1957 |
