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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jason Sanders | 0.83 | 1952-1955 | |
| 2 | Andy Flowers* | 0.86 | 1955-1959 | |
| 3 | Travis Brown | 0.90 | 1961-1964 | |
| 4 | José García | 0.91 | 1953-1956 | |
| 4 | Hugo Brederode | 0.91 | 1963-1968 | |
| 6 | Jim Morton* | 0.95 | 1961-1964 | |
| 7 | Rod Johnston | 0.98 | 1958-1961 | |
| 7 | Anthony Moore | 0.98 | 1961-1964 | |
| 9 | Jeff Brown | 1.01 | 1955-1959 | |
| 10 | Raúl Jiménez | 1.02 | 1962-1966 | |
| 11 | Freddy Rosado | 1.05 | 1957-1960 | |
| 12 | Woodrow Davis* | 1.06 | 1954-1957 | |
| 12 | Pat Miller | 1.06 | 1957-1960 | |
| 12 | José Álvarez | 1.06 | 1961-1966 | |
| 15 | Davis Ayliffe# | 1.07 | 1978-1981 | |
| 15 | Freddy Pérez | 1.07 | 1958-1961 | |
| 17 | Sergio Vásquez | 1.08 | 1966-1969 | |
| 18 | Danny Ventura# | 1.09 | 1987-1990 | |
| 18 | Cris Vilardebo# | 1.09 | 1982-1986 | |
| 18 | William Wilson# | 1.09 | 1979-1983 | |
| 21 | Bill López | 1.10 | 1947-1950 | |
| 22 | John López | 1.11 | 1965-1968 | |
| 23 | Duncan Johnson# | 1.13 | 1988-1991 | |
| 24 | Lorenzo Espinoza | 1.14 | 1959-1963 | |
| 24 | William Lee# | 1.14 | 1983-1986 | |
| 26 | José Molina | 1.15 | 1962-1967 | |
| 27 | Chris Reynolds* | 1.16 | 1911-1914 | |
| 28 | Norm Harris# | 1.19 | 1983-1986 | |
| 28 | Manuel Castaneda | 1.19 | 1948-1951 | |
| 28 | Sancho Hernández# | 1.19 | 1983-1986 | |
| 31 | Ricardo Rico# | 1.21 | 1970-1973 | |
| 32 | Steve Ferguson# | 1.22 | 1973-1978 | |
| 33 | Claudio Romero# | 1.25 | 1976-1980 | |
| 33 | Dan Nelson | 1.25 | 1964-1967 | |
| 35 | Sonny Lawrence | 1.26 | 1960-1963 | |
| 36 | Francisco Rivera | 1.28 | 1971-1974 | |
| 37 | Orlando Ramírez | 1.29 | 1977-1981 | |
| 37 | Ambrose Sanders# | 1.29 | 1977-1980 | |
| 37 | Félix Díaz | 1.29 | 1966-1969 | |
| 40 | Jim Lyons | 1.30 | 1963-1966 | |
| 41 | Armando Rivera | 1.31 | 1919-1922 | |
| 41 | Nicholas Cassidy | 1.31 | 1969-1972 | |
| 43 | Jimmy Bacon# | 1.33 | 1972-1974 | |
| 43 | Cliff James | 1.33 | 1958-1961 | |
| 45 | Cam Knap | 1.35 | 1967-1971 | |
| 45 | Alfredo Enríquez# | 1.35 | 1983-1986 | |
| 47 | Rob Davis# | 1.39 | 1976-1979 | |
| 47 | Peter Alexander# | 1.39 | 1982-1985 | |
| 49 | Kevin Pollock# | 1.40 | 1971-1974 | |
| 50 | Jack Ashley | 1.42 | 1957-1960 | |
| 51 | Ángel Lombos | 1.44 | 1918-1921 | |
| 51 | Richard Ward* | 1.44 | 1919-1922 | |
| 53 | Chris Thompson | 1.45 | 1974-1977 | |
| 54 | Teddy Turner | 1.46 | 1974-1977 | |
| 54 | Curtis Orr | 1.46 | 1911-1915 | |
| 56 | Louis Hutchinson# | 1.48 | 1979-1982 | |
| 57 | Luis Martínez | 1.50 | 1968-1972 | |
| 58 | Ryan Duncan | 1.51 | 1941-1944 | |
| 58 | Mal Wright | 1.51 | 1916-1919 | |
| 60 | Alejandro Sánchez | 1.52 | 1936-1939 | |
| 61 | Gustavo Salas | 1.53 | 1927-1930 | |
| 62 | Allen Haynes | 1.56 | 1974-1977 | |
| 62 | Domingo Fajardo | 1.56 | 1927-1930 | |
| 64 | Eric Carlisle | 1.57 | 1927-1930 | |
| 65 | Gustavo Miranda# | 1.58 | 1975-1978 | |
| 65 | Eduardo Delpino# | 1.58 | 1976-1980 | |
| 65 | Lorenzo Maldonado | 1.58 | 1973-1976 | |
| 68 | Pat Egglestone | 1.61 | 1935-1938 | |
| 69 | Clancy Swanson | 1.66 | 1944-1948 | |
| 70 | Blake Johnson | 1.69 | 1957-1960 | |
| 71 | Ron Griffin | 1.71 | 1926-1929 | |
| 72 | Kel Brooks* | 1.72 | 1927-1930 | |
| 73 | Jeff Rainey# | 1.73 | 1976-1980 | |
| 74 | Brock Tebby | 1.75 | 1937-1940 | |
| 75 | Dave Carter | 1.81 | 1919-1923 | |
| 76 | Kevin Barnett | 1.88 | 1930-1933 | |
| 77 | Tom Hayes | 1.89 | 1935-1938 | |
| 77 | Armando Rea | 1.89 | 1926-1929 | |
| 79 | Steve Sommer | 1.91 | 1936-1938 | |
| 80 | Keith Hayes | 2.25 | 1931-1935 | |
| 81 | Yannick Goor | 2.28 | 1936-1939 |
