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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OBP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Buster Posey* | .360 | 2015-2023 | |
| 2 | Austin Allen# | .349 | 2018-2025 | |
| 3 | Kevin Plawecki# | .343 | 2016-2025 | |
| 4 | T.J. Collett# | .336 | 2020-2025 | |
| 5 | Reese McGuire# | .313 | 2017-2025 | |
| 6 | Jonathan Lucroy | .312 | 2015-2020 | |
| 7 | Josmil Pinto | .308 | 2015-2020 | |
| 8 | Ryan Casteel# | .305 | 2017-2025 | |
| 9 | Carlton Fisk# | .304 | 2020-2025 | |
| 10 | Russell Martin | .303 | 2015-2019 | |
| 11 | Salvador Perez | .302 | 2015-2024 | |
| 12 | Zack Collins# | .301 | 2019-2025 | |
| 13 | Yadier Molina | .299 | 2015-2018 | |
| 14 | Oscar Hernandez | .298 | 2016-2024 | |
| 14 | Travis d'Arnaud | .298 | 2015-2019 | |
| 16 | J.T. Realmuto | .294 | 2015-2024 | |
| 16 | Tom J. Murphy# | .294 | 2018-2025 | |
| 18 | Max Stassi# | .290 | 2016-2025 | |
| 19 | Yan Gomes | .286 | 2015-2023 | |
| 20 | Luis Torrens | .272 | 2018-2025 | |
| 21 | Justin O'Conner | .270 | 2016-2024 | |
| 22 | Austin Hedges | .258 | 2015-2022 |
