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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Katsumoto Ine | 1.25 | 2047-2051 | |
| 2 | Roy Alsobrook | 1.26 | 2028-2038 | |
| 3 | António López | 1.27 | 2041-2050 | |
| 4 | Mario Silva# | 1.28 | 2042-2053 | |
| 5 | Danny Byrd | 1.29 | 2044-2050 | |
| 6 | Marvin Stevens# | 1.34 | 2043-2053 | |
| 7 | Ikaia Duncalf# | 1.35 | 2045-2054 | |
| 7 | Patrick Ibáñez | 1.35 | 2035-2046 | |
| 7 | Drew Cullen | 1.35 | 2027-2035 | |
| 10 | Mario Ruíz | 1.40 | 2023-2031 | |
| 11 | Victor Brey | 1.41 | 2021-2028 | |
| 11 | Jorge Cedeño | 1.41 | 2033-2037 | |
| 13 | Matt Davenport | 1.42 | 2029-2037 | |
| 13 | Noboru Kokawa# | 1.42 | 2048-2054 | |
| 15 | Gary Barber | 1.43 | 2021-2033 | |
| 15 | Luis Hernández | 1.43 | 2030-2037 | |
| 17 | José Salinas | 1.45 | 2017-2027 | |
| 17 | Wop Baars | 1.45 | 2032-2041 | |
| 19 | Claudio Díaz | 1.49 | 2022-2031 | |
| 20 | Steve Young | 1.50 | 2042-2049 | |
| 21 | King Fletcher | 1.55 | 2023-2030 | |
| 22 | Chae-seong Kim | 1.56 | 2023-2033 | |
| 22 | Arthur Stevenson# | 1.56 | 2046-2053 | |
| 24 | Willie Cameron | 1.60 | 2016-2031 | |
| 25 | Earl Brown | 1.75 | 2023-2031 | |
| 26 | Reynaldo Sánchez | 1.77 | 2024-2032 | |
| 27 | Marcos Mesa | 1.82 | 2023-2030 |
