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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OSLG | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | J R Richard# | .3143 | 2015 | |
| 2 | Mike Scott# | .3333 | 2015 | |
| 3 | Dazzy Vance# | .3372 | 2014 | |
| 4 | Sandy Koufax# | .3400 | 2014 | |
| 5 | Doug Drabek# | .3467 | 2015 | |
| 6 | Ron Guidry# | .3750 | 2014 | |
| 7 | Don Sutton# | .3968 | 2014 | |
| 8 | John Candelaria# | .4154 | 2015 | |
| 8 | Lefty Gomez# | .4154 | 2014 | |
| 10 | Whitey Ford# | .4167 | 2014 | |
| 11 | Shane Reynolds# | .4521 | 2015 |
