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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Roberto Calderón# | 1.19 | 2024-2027 | |
| 2 | Lucas Begay# | 1.25 | 2025-2028 | |
| 3 | Travis Carson# | 1.33 | 2022-2024 | |
| 4 | Mario Ruíz# | 1.35 | 2023-2027 | |
| 5 | Frank Bryant# | 1.36 | 2021-2028 | |
| 6 | Miguel Cervantes# | 1.40 | 2026-2028 | |
| 7 | Victor Brey# | 1.41 | 2021-2028 | |
| 7 | Artie Horton | 1.41 | 2022-2025 | |
| 7 | Dennis Brown# | 1.41 | 2022-2026 | |
| 10 | Eduardo Capata# | 1.43 | 2019-2021 | |
| 10 | Cris Herrera# | 1.43 | 2022-2027 | |
| 12 | José Salinas# | 1.45 | 2017-2027 | |
| 13 | Henri Pollini# | 1.47 | 2019-2028 | |
| 13 | Miguel Hernández# | 1.47 | 2023-2026 | |
| 13 | Claudio Díaz# | 1.47 | 2022-2025 | |
| 16 | Louis McDowell# | 1.50 | 2016-2028 | |
| 17 | Marvin Mangin# | 1.53 | 2023-2028 | |
| 18 | Jeff Schneider# | 1.55 | 2022-2028 | |
| 19 | Chae-seong Kim# | 1.56 | 2023-2027 | |
| 19 | King Fletcher# | 1.56 | 2023-2028 | |
| 19 | Norm Burris | 1.56 | 2016-2021 | |
| 22 | Willie Cameron# | 1.58 | 2016-2028 | |
| 23 | José Acevedo | 1.62 | 2013-2023 | |
| 24 | Pedro Lara# | 1.63 | 2025-2028 | |
| 25 | Morris Nicholson | 1.65 | 2013-2021 | |
| 26 | Aurélien Godet | 1.69 | 2015-2023 | |
| 26 | Dave Conley | 1.69 | 2015-2018 | |
| 28 | Reynaldo Sánchez# | 1.70 | 2024-2028 | |
| 28 | Greg Beaver | 1.70 | 2016-2019 | |
| 30 | António Ybarra | 1.72 | 2021-2024 | |
| 31 | Earl Brown# | 1.78 | 2023-2028 | |
| 32 | Doug Ryan | 1.79 | 2016-2024 | |
| 33 | Marcos Mesa# | 1.84 | 2023-2028 |
