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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OOBP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Casey Kelly# | .2321 | 2021 | |
| 2 | David Buchanan# | .2346 | 2021 | |
| 3 | Roberto Perez | .2581 | 2017 | |
| 4 | Jhony Brito# | .2658 | 2024 | |
| 5 | Carlos Rodon# | .2800 | 2017 | |
| 6 | Alex Meyer | .2857 | 2014 | |
| 7 | Danny Salazar | .2892 | 2014 | |
| 8 | Josh James# | .2895 | 2020 | |
| 9 | Luis Perdomo# | .2931 | 2017 | |
| 10 | Madison Bumgarner | .2941 | 2013 | |
| 11 | Julio Teheran | .2959 | 2013 | |
| 12 | Carlos Rodon# | .2987 | 2016 | |
| 13 | Miguel A. Gonzalez | .3171 | 2014 | |
| 14 | Austin Pruitt# | .3243 | 2021 | |
| 15 | Miguel A. Gonzalez | .3250 | 2016 | |
| 16 | Anthony DeSclafani# | .3258 | 2016 | |
| 17 | Robbie Erlin# | .3333 | 2014 | |
| 18 | Grayson Long | .3425 | 2018 | |
| 19 | Jeremy Hefner | .3445 | 2013 | |
| 20 | Clay Buchholz | .3545 | 2013 | |
| 21 | Spencer Arrighetti# | .3623 | 2025 | |
| 22 | Jake Thompson | .3846 | 2020 | |
| 23 | Ryne Nelson# | .3857 | 2023 |
