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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Oswald Knapp# | .5622 | 1954 | |
| 2 | Yoshitomo Ono# | .5314 | 1952 | |
| 3 | Shigeya Kawamura# | .5244 | 1952 | |
| 4 | Bruce Coburn# | .4979 | 1955 | |
| 5 | Vitezslav Silhavy# | .4836 | 1953 | |
| 6 | Alex Lopez# | .4735 | 1953 | |
| 7 | Wessel de Joode# | .4625 | 1952 | |
| 8 | Alfonso Salas# | .4224 | 1952 | |
| 9 | Charlie Watts# | .4217 | 1954 | |
| 10 | Eric Line# | .4195 | 1952 | |
| 11 | Neil Catron# | .4178 | 1953 | |
| 12 | Bradley van Ham# | .3094 | 1955 |
