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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Giulio Pisa# | .6373 | 1953 | |
| 2 | Jake Mahar# | .5355 | 1955 | |
| 3 | Ramiro Salas# | .4815 | 1955 | |
| 4 | Kanzaburo Tsuchida# | .4803 | 1955 | |
| 5 | Steve Johnson# | .4696 | 1952 | |
| 6 | Bryan Peden# | .4619 | 1954 | |
| 7 | Ethan Watson# | .4559 | 1954 | |
| 8 | Bobby Field# | .4521 | 1953 | |
| 9 | Alex Martinez# | .4292 | 1952 | |
| 10 | Steven Stannard# | .3826 | 1952 | |
| 11 | Danny Bailey# | .3756 | 1952 |
