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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | IP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Katsumoto Nakayama# | 840.1 | 2014-2014 | |
| 2 | Hiroji Sugahara | 829.0 | 2014-2014 | |
| 3 | Toyoaki Ishikawa# | 815.1 | 2015-2015 | |
| 4 | Taki Wada# | 796.1 | 2014-2014 | |
| 5 | Sekien Ohashi | 787.0 | 2014-2014 | |
| 6 | Takuma Kobayashi | 775.0 | 2013-2013 | |
| 7 | Nobuo Sugahara | 769.2 | 2014-2014 | |
| 8 | Tetsu Nishimura# | 769.0 | 2012-2012 | |
| 9 | Ichizo Hirose | 755.0 | 2012-2012 | |
| 10 | Yachi Okamoto# | 709.2 | 2016-2016 | |
| 11 | Kohei Takeuchi | 687.0 | 2013-2013 |
