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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Luis Moreno# | .6000 | 1955 | |
| 2 | Émile Marion# | .5758 | 1955 | |
| 3 | Gavino Maini# | .5556 | 1955 | |
| 4 | Ricciardo Farinelli# | .5000 | 1955 | |
| 5 | Moriaki Kochi# | .4516 | 1955 | |
| 6 | Volodya Ahapkin# | .4444 | 1955 | |
| 7 | Eduardo Valle# | .4231 | 1955 | |
| 8 | Gan Fung# | .4167 | 1955 | |
| 9 | Manuel Cisneros# | .3600 | 1955 | |
| 10 | Sam Renwick# | .3571 | 1955 | |
| 11 | Pavle Stojkovic# | .3333 | 1955 | |
| 12 | Jose Abril# | .3200 | 1955 | |
| 13 | Dietrich Meyers# | .2581 | 1955 | |
| 14 | Hiang-ta Zang# | .2500 | 1955 | |
| 15 | Chris Mathews# | .2400 | 1955 |
