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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Jessy Kok# | 0.69 | 1958 | |
| 2 | Ewan Moore# | 1.00 | 1952 | |
| 3 | Ewan Moore# | 1.02 | 1956 | |
| 4 | Hirose Inouye# | 1.06 | 1958 | |
| 4 | Mounir Soulier# | 1.06 | 1953 | |
| 6 | Eitan Löbel# | 1.07 | 1958 | |
| 7 | Seon-jong Kim# | 1.09 | 1956 | |
| 8 | Hirose Inouye# | 1.12 | 1957 | |
| 9 | Mounir Soulier# | 1.13 | 1956 | |
| 10 | Mounir Soulier# | 1.14 | 1952 | |
| 11 | Chris Walker# | 1.17 | 1954 | |
| 12 | Renaud Goffi# | 1.20 | 1958 | |
| 13 | Ewan Moore# | 1.23 | 1957 | |
| 13 | Danny Arellano# | 1.23 | 1953 | |
| 15 | Ewan Moore# | 1.24 | 1958 | |
| 15 | Alexandre Lefevre# | 1.24 | 1956 | |
| 17 | Khalil Smith# | 1.28 | 1954 | |
| 18 | Theodor Brown# | 1.29 | 1954 | |
| 19 | Griff Murphy# | 1.31 | 1955 | |
| 20 | Omar Cespedes# | 1.32 | 1953 | |
| 21 | Juan Flores# | 1.34 | 1957 | |
| 22 | Ewan Moore# | 1.43 | 1955 | |
| 23 | Aaron Maier# | 1.47 | 1952 | |
| 24 | Aaron Maier# | 1.48 | 1953 | |
| 25 | John Hahn# | 1.50 | 1955 | |
| 25 | Chris Walker# | 1.50 | 1955 | |
| 25 | Chris Alexander# | 1.50 | 1957 | |
| 28 | Ken Roberts# | 1.62 | 1955 | |
| 29 | Adam Scali# | 1.87 | 1954 | |
| 30 | Jim Meagher# | 1.89 | 1955 |
