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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Kichibei Yamauchi# | .5423 | 2036-2042 | |
| 2 | Vicente Canó# | .4805 | 2031-2041 | |
| 3 | Masayoshi Ono# | .4779 | 2032-2041 | |
| 4 | Totoya Nagai# | .4245 | 2030-2041 | |
| 5 | Naganori Sato# | .4152 | 2030-2043 | |
| 6 | Moromao Murakami# | .4045 | 2029-2042 | |
| 7 | Kazuo Yamane# | .4042 | 2031-2039 | |
| 8 | Ryutaro Yoshida# | .3955 | 2026-2040 |
