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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Ed Byrnes | 1.29 | 2034-2041 | |
| 2 | Jorge Torrez | 1.32 | 2034-2040 | |
| 2 | Zenon-Alejandro Paez | 1.32 | 2034-2045 | |
| 4 | Heui-chung Chon# | 1.33 | 2055-2062 | |
| 5 | Steve Miller | 1.36 | 2037-2044 | |
| 6 | Marçall Rivera | 1.38 | 2025-2033 | |
| 7 | José García | 1.39 | 2029-2036 | |
| 7 | Earl Moriarty# | 1.39 | 2056-2064 | |
| 9 | Xavier Colón | 1.41 | 2036-2044 | |
| 10 | Arturo Castro# | 1.42 | 2053-2062 | |
| 10 | Mike Cox | 1.42 | 2042-2047 | |
| 10 | Mike Cheney# | 1.42 | 2058-2065 | |
| 13 | Eric Turner | 1.43 | 2028-2037 | |
| 13 | Bubba Johnson | 1.43 | 2035-2045 | |
| 15 | Ed Fisher | 1.45 | 2023-2030 | |
| 15 | Rubén Herrera | 1.45 | 2048-2055 | |
| 15 | Daniel León | 1.45 | 2034-2044 | |
| 18 | Ernesto Guzalán | 1.46 | 2038-2042 | |
| 18 | Xavier Quinn | 1.46 | 2037-2044 | |
| 20 | Julián Correa | 1.47 | 2030-2037 | |
| 21 | António Maldonado | 1.48 | 2043-2053 | |
| 22 | Steve Flowers# | 1.49 | 2053-2062 | |
| 23 | Mario Garza# | 1.50 | 2057-2062 | |
| 23 | Jim Frost# | 1.50 | 2053-2062 | |
| 25 | Albert Valverde | 1.51 | 2048-2058 | |
| 26 | Reginald McDaniel | 1.52 | 2039-2048 | |
| 26 | Eli García | 1.52 | 2024-2032 | |
| 26 | Nick McGuire# | 1.52 | 2059-2065 | |
| 29 | Sam King | 1.53 | 2013-2023 | |
| 30 | Leon Misner | 1.54 | 2034-2041 | |
| 31 | Jesús Montoya | 1.55 | 2038-2045 | |
| 31 | Bobby Higgins | 1.55 | 2034-2043 | |
| 33 | Rodrigo López# | 1.58 | 2057-2063 | |
| 33 | Victor Arango# | 1.58 | 2057-2065 | |
| 33 | Jiro Matsuda# | 1.58 | 2057-2062 | |
| 36 | Esteban Huerta# | 1.60 | 2055-2062 | |
| 37 | Artie Church | 1.61 | 2018-2028 | |
| 38 | Bob Beenhakker | 1.62 | 2032-2041 | |
| 39 | Alfredo Pérez | 1.64 | 2047-2055 | |
| 40 | Jorge Valarcel | 1.66 | 2037-2047 | |
| 41 | Don Wood | 1.74 | 2024-2031 | |
| 41 | Shizuka Sato# | 1.74 | 2057-2064 | |
| 43 | Jake Thomas# | 1.83 | 2058-2065 | |
| 44 | Freddy Pueblo | 2.08 | 2018-2025 |
