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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Steve Kleinberg | .5008 | 1952-1956 | |
| 2 | Haruyoshi Chikasuye# | .4702 | 1952-1954 | |
| 3 | Bosko Racic# | .4592 | 1952-1955 | |
| 4 | Arman Igumentsev# | .4563 | 1952-1954 | |
| 5 | Takeichi Tamura | .4552 | 1952-1955 |
