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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tomoaki Nakamura# | .5333 | 1952-1955 | |
| 2 | Jim Walchak | .5056 | 1952-1954 | |
| 3 | Mario van Dinteren# | .5018 | 1955-1959 | |
| 4 | Matthew Brown# | .4631 | 1957-1959 | |
| 5 | Yutaka Harada# | .4493 | 1956-1959 | |
| 6 | Bobby Ziomek | .4471 | 1952-1954 | |
| 7 | Pedro Flores# | .4090 | 1952-1955 |
