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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Lucas Begay# | 1.25 | 2025-2028 | |
| 2 | Travis Carson# | 1.33 | 2022-2031 | |
| 3 | Mario Ruíz# | 1.40 | 2023-2031 | |
| 4 | Miguel Álvarez# | 1.41 | 2027-2031 | |
| 4 | Victor Brey# | 1.41 | 2021-2028 | |
| 6 | Gary Barber# | 1.43 | 2021-2031 | |
| 7 | Dennis Brown# | 1.44 | 2022-2030 | |
| 7 | Henri Pollini# | 1.44 | 2019-2030 | |
| 9 | José Salinas | 1.45 | 2017-2027 | |
| 10 | Claudio Díaz# | 1.49 | 2022-2031 | |
| 11 | Louis McDowell# | 1.50 | 2016-2028 | |
| 12 | Seong-rae Park# | 1.52 | 2023-2031 | |
| 13 | Marvin Mangin | 1.53 | 2023-2028 | |
| 14 | Jeff Schneider# | 1.55 | 2022-2028 | |
| 14 | King Fletcher# | 1.55 | 2023-2030 | |
| 16 | Chae-seong Kim# | 1.56 | 2023-2030 | |
| 16 | Norm Burris | 1.56 | 2016-2021 | |
| 18 | Willie Cameron | 1.60 | 2016-2031 | |
| 19 | José Acevedo | 1.62 | 2013-2023 | |
| 20 | Pedro Pacheco# | 1.65 | 2020-2031 | |
| 20 | Morris Nicholson | 1.65 | 2013-2021 | |
| 22 | Earl Brown# | 1.75 | 2023-2031 | |
| 23 | Reynaldo Sánchez# | 1.78 | 2024-2031 | |
| 24 | Doug Ryan | 1.79 | 2016-2024 | |
| 25 | Marcos Mesa | 1.82 | 2023-2030 |
