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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | IP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Terumoto Nii | 13051.0 | 2021-2037 | |
| 2 | Yosuke Miyazaki# | 7626.0 | 2031-2042 | |
| 3 | Jiro Kawaguchi | 5456.2 | 2030-2039 | |
| 4 | Germán Limón# | 5409.0 | 2031-2042 | |
| 5 | Roger Garrett | 4841.1 | 2028-2036 | |
| 6 | Naomi Miyazaki# | 4835.1 | 2034-2042 | |
| 7 | Martin Dupuis | 3967.1 | 2025-2039 | |
| 8 | Toshikazu Hirata# | 3450.2 | 2033-2042 | |
| 9 | Mike Shaw# | 3436.0 | 2031-2037 | |
| 10 | Naonobu Shinoda# | 3271.2 | 2030-2042 | |
| 11 | Daryl Kneeshaw# | 2963.0 | 2031-2042 | |
| 12 | Nick LeClaire | 2901.1 | 2029-2035 | |
| 13 | Lorenzo Bray | 2800.0 | 2034-2037 | |
| 14 | Totoya Nagai# | 2766.1 | 2032-2042 | |
| 15 | Charles Allcorn | 2524.1 | 2035-2040 | |
| 16 | António Mora# | 2454.1 | 2037-2041 | |
| 17 | Yasuoka Fujihara | 2412.0 | 2030-2034 | |
| 18 | Hideki Saikawa# | 2078.0 | 2037-2041 | |
| 19 | Alejandro Elisary | 2069.1 | 2037-2040 | |
| 20 | Eliseo Cuoco# | 2003.2 | 2040-2042 |
