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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OBP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Len Jackson# | .4324 | 1982-1991 | |
| 2 | Steve McLaughlin | .4203 | 1954-1965 | |
| 3 | Merrill Smith | .4141 | 1975-1989 | |
| 4 | Harold Williams | .4109 | 1963-1974 | |
| 5 | Sterling Patterson | .3984 | 1946-1955 | |
| 6 | Hanus Huml | .3515 | 1945-1953 | |
| 7 | Jesús Muńóz | .3373 | 1936-1946 | |
| 8 | Sepp Kiemlen | .3202 | 1934-1945 |
