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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 | Shawn Arnold | 1.36 | 2015-2022 | |
| 3 | Pedro Romero | 1.38 | 2020-2026 | |
| 3 | Louis McDowell | 1.38 | 2015-2030 | |
| 5 | Steve Bryan | 1.40 | 2019-2031 | |
| 6 | Scott Mildren# | 1.42 | 2024-2027 | |
| 7 | Mark Tucker | 1.43 | 2017-2021 | |
| 8 | Júlio Vázquez# | 1.45 | 2027-2032 | |
| 9 | Jesús López | 1.47 | 2016-2023 | |
| 10 | Woo-suk Cho# | 1.48 | 2026-2032 | |
| 10 | António Fabián# | 1.48 | 2020-2028 | |
| 12 | Jeff Moore | 1.49 | 2020-2022 | |
| 13 | Homer O'Lannigan | 1.53 | 2018-2021 | |
| 14 | David Davis# | 1.55 | 2019-2030 | |
| 15 | Rob Smith | 1.56 | 2018-2027 | |
| 15 | Bob McGhee | 1.56 | 2015-2028 | |
| 17 | Eric Patnode | 1.57 | 2016-2025 | |
| 18 | Mike Barrett | 1.59 | 2022-2027 | |
| 18 | Josh Gardner | 1.59 | 2017-2021 | |
| 20 | Travis Nelson | 1.61 | 2024-2029 |
