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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Robert Cook | 0.97 | 2021-2036 | |
| 2 | Kagehisa Saikawa | 1.05 | 2022-2035 | |
| 2 | Wayne Penfield | 1.05 | 2020-2029 | |
| 4 | Joe Ward | 1.07 | 2013-2022 | |
| 5 | Ryan Eubanks | 1.12 | 2051-2060 | |
| 5 | Ramón Gómez | 1.12 | 2027-2039 | |
| 5 | Adharma Sughavanam | 1.12 | 2024-2035 | |
| 8 | Manuel Sánchez | 1.15 | 2024-2035 | |
| 9 | Devon Miller | 1.16 | 2047-2054 | |
| 10 | Vincent Vickers | 1.23 | 2025-2038 | |
| 11 | Will Witten# | 1.27 | 2060-2060 | |
| 12 | John Stroud | 1.29 | 2021-2030 | |
| 12 | James Crowe | 1.29 | 2032-2043 | |
| 12 | Alain Picard | 1.29 | 2030-2042 | |
| 15 | Yoshiaga Rin | 1.30 | 2024-2032 | |
| 16 | Khalil Haywood# | 1.31 | 2053-2060 | |
| 16 | Alex Nambo | 1.31 | 2033-2043 | |
| 18 | Paul Durden | 1.34 | 2012-2017 | |
| 18 | Joey Cabler | 1.34 | 2043-2050 | |
| 18 | Mike Sprake | 1.34 | 2020-2027 | |
| 21 | Ricky Juarez | 1.39 | 2038-2043 | |
| 21 | Yeong-suk Kim | 1.39 | 2021-2034 | |
| 21 | Carlos León | 1.39 | 2022-2033 | |
| 24 | Luis Padro# | 1.40 | 2053-2060 | |
| 25 | Torikatzu Nishiyama | 1.42 | 2038-2043 | |
| 25 | Eddie Beltran | 1.42 | 2042-2054 | |
| 25 | Ken Stein | 1.42 | 2034-2045 | |
| 28 | Willi Kehr | 1.45 | 2030-2035 | |
| 28 | Rick Childress | 1.45 | 2026-2034 | |
| 30 | Carlos Ramirez | 1.48 | 2042-2047 | |
| 31 | Joel Hyle | 1.51 | 2052-2057 | |
| 31 | Kichibei Ozawa | 1.51 | 2026-2030 | |
| 33 | Juan Martínez | 1.53 | 2030-2043 | |
| 34 | Alex Munoz | 1.54 | 2034-2044 | |
| 35 | Emilio Peres | 1.55 | 2038-2044 | |
| 36 | Lester Bisdu | 1.62 | 2030-2042 | |
| 36 | Marcus Seraphin | 1.62 | 2048-2056 | |
| 38 | Jorge Olivo | 1.71 | 2032-2038 | |
| 39 | Alberto Ramírez | 1.80 | 2018-2026 | |
| 40 | Dennis Montgomery | 1.97 | 2030-2042 | |
| 41 | Joe Hurst | 2.09 | 2025-2033 | |
| 42 | Lloyd Huggins | 2.11 | 2032-2041 |
