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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Year | Champion | LgERA | LgAvg | Lg |
|---|---|---|---|---|
| 2015 | Seattle Terns | 5.63 | .302 | 3AA |
| 2016 | Gurdon Pelicans | 5.33 | .288 | 3AA |
| 2017 | Salem Misfits | 5.32 | .290 | 3AA |
| 2018 | Portsmouth Coasties | 5.39 | .287 | 3AA |
| 2019 | Yakima Hops | 4.94 | .277 | 3AA |
| 2020 | Salem Misfits | 3.84 | .263 | 3AA |
| 2021 | San Antonio BC | 3.96 | .260 | 3AA |
| 2022 | Salem Misfits | 3.88 | .259 | 3AA |
| 2023 | Atlantic City Sonics | 4.39 | .269 | 3AA |
| 2024 | San Bernardino Grasshoppers | 3.91 | .259 | 3AA |
