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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | R.J. Anderson | 1.33 | 2020-2027 | |
| 2 | Pedro Romero | 1.38 | 2020-2026 | |
| 2 | Louis McDowell | 1.38 | 2015-2030 | |
| 4 | Steve Bryan | 1.40 | 2019-2031 | |
| 5 | Júlio Vázquez# | 1.45 | 2027-2032 | |
| 6 | Woo-suk Cho# | 1.48 | 2026-2032 | |
| 6 | António Fabián# | 1.48 | 2020-2028 | |
| 8 | Jeff Moore | 1.49 | 2020-2022 | |
| 9 | Homer O'Lannigan | 1.53 | 2018-2021 | |
| 10 | David Davis# | 1.55 | 2019-2030 | |
| 11 | Bob McGhee | 1.56 | 2015-2028 | |
| 12 | Mike Barrett | 1.59 | 2022-2027 | |
| 13 | Travis Nelson | 1.61 | 2024-2029 |
