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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Thom Wilcox* | .605 | 2013-2028 | |
| 2 | Mario Castillo# | .467 | 2032-2039 | |
| 3 | Ki-tak Im | .411 | 2024-2036 | |
| 4 | Tamasaburo Kato | .406 | 2021-2037 | |
| 5 | Roland Deschain# | .395 | 2026-2039 | |
| 6 | Xavier Hernández | .388 | 2026-2039 | |
| 7 | Noel Ballard* | .387 | 2017-2034 | |
| 8 | Bob Heller | .370 | 2015-2026 | |
| 9 | Jorge Trevino | .366 | 2019-2026 | |
| 10 | Bernardo Herrera | .364 | 2019-2035 | |
| 11 | Juan Cabrera | .363 | 2015-2036 | |
| 12 | Tim Barnes | .295 | 2017-2027 |
