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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 | 2021-2034 | |
| 2 | Kagehisa Saikawa# | 1.05 | 2022-2034 | |
| 2 | Wayne Penfield | 1.05 | 2020-2029 | |
| 4 | Joe Ward | 1.07 | 2013-2022 | |
| 5 | Adharma Sughavanam# | 1.12 | 2024-2034 | |
| 6 | Manuel Sánchez# | 1.15 | 2024-2034 | |
| 7 | Takeji Ogawa# | 1.17 | 2026-2034 | |
| 8 | Vincent Vickers# | 1.23 | 2025-2034 | |
| 9 | John Stroud | 1.29 | 2021-2030 | |
| 10 | Yoshiaga Rin# | 1.30 | 2024-2032 | |
| 11 | Paul Durden | 1.34 | 2012-2017 | |
| 11 | Mike Sprake | 1.34 | 2020-2027 | |
| 13 | Matsuyo Koda# | 1.35 | 2031-2034 | |
| 14 | Yeong-suk Kim# | 1.39 | 2021-2034 | |
| 14 | Carlos León# | 1.39 | 2022-2033 | |
| 16 | Willi Kehr# | 1.45 | 2030-2032 | |
| 16 | Rick Childress# | 1.45 | 2026-2034 | |
| 18 | Kichibei Ozawa | 1.51 | 2026-2030 | |
| 19 | Lester Bisdu# | 1.62 | 2030-2032 | |
| 20 | Alberto Ramírez | 1.80 | 2018-2026 | |
| 21 | Joe Hurst# | 2.09 | 2025-2033 |
