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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jon Maas# | .6250 | 1956 | |
| 2 | Mike Ross# | .5714 | 1953 | |
| 3 | Robby Fritz# | .5568 | 1955 | |
| 4 | Robby Fritz# | .5551 | 1956 | |
| 5 | Jelle Hofste# | .5533 | 1958 | |
| 6 | Kun-woo Kang# | .5455 | 1956 | |
| 7 | Lawson Connor# | .5412 | 1952 | |
| 8 | Jon Bertelson# | .5205 | 1955 | |
| 9 | Hector Molina# | .5164 | 1954 | |
| 10 | Uinsin Goff# | .5000 | 1958 | |
| 11 | Maxime Capriotti# | .4682 | 1956 | |
| 12 | Alwin Ruijten# | .4637 | 1958 | |
| 13 | Henri Thomas | .4419 | 1952 | |
| 14 | Nate Marmolejo# | .4254 | 1953 | |
| 15 | Larry Gabriele# | .4244 | 1958 | |
| 16 | Lewis Bowers# | .4192 | 1954 | |
| 17 | Armando Llanes | .4160 | 1952 | |
| 18 | Hughie Jones# | .4026 | 1952 | |
| 19 | Danny Raymundo# | .4021 | 1955 | |
| 20 | Danny Raymundo# | .3962 | 1956 | |
| 21 | Tomofumi Kino# | .3918 | 1954 | |
| 22 | Nate Marmolejo# | .3802 | 1952 | |
| 23 | Maxime Capriotti# | .3763 | 1955 | |
| 24 | Josh Henley# | .3398 | 1952 | |
| 25 | Maurice Château# | .3333 | 1952 |
