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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Perry Harris | 0.85 | 2029-2032 | |
| 2 | Rob Stanley# | 0.88 | 2041-2042 | |
| 3 | Mike Pullman# | 0.90 | 2042-2047 | |
| 4 | José Chapa# | 1.11 | 2041-2042 | |
| 5 | William Dorey# | 1.18 | 2041-2044 | |
| 6 | Mike Barker# | 1.21 | 2041-2043 | |
| 7 | Carlos López# | 1.29 | 2043-2044 | |
| 8 | John Keil# | 1.35 | 2044-2045 | |
| 9 | Daniel Barnes# | 1.45 | 2042-2043 | |
| 10 | Anatolio Lucci# | 1.56 | 2041-2045 | |
| 11 | Vincent Baird# | 1.64 | 2041-2046 |
