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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | IP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Soshu Rin# | 828.0 | 2012-2012 | |
| 2 | Tetsui Okamoto | 814.1 | 2012-2012 | |
| 3 | Nobuhito Koyama | 803.2 | 2012-2012 | |
| 4 | Hogai Kuwabara | 743.0 | 2012-2012 | |
| 5 | Kinnosuke Miyazaki# | 737.1 | 2015-2015 | |
| 6 | Mitsuharu Kohara# | 717.2 | 2015-2015 | |
| 7 | Ryutaro Nemoto | 701.0 | 2012-2012 | |
| 8 | Toshikasu Ono# | 695.1 | 2016-2016 | |
| 9 | Seiichi Tanaka# | 679.1 | 2013-2013 | |
| 10 | Takuro Ono# | 675.2 | 2016-2016 | |
| 11 | Tsuneari Okamura | 604.0 | 2014-2014 | |
| 12 | Eisuke Kobayashi | 598.2 | 2014-2014 | |
| 13 | Nobukazu Ogura# | 592.1 | 2016-2016 | |
| 14 | Kichisaburo Suzuki# | 582.0 | 2013-2013 | |
| 15 | Katsuhiko Yamamoto# | 580.2 | 2013-2013 |
