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| |
| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tetsuji Iwasaki# | 1.02 | 1946-1947 | |
| 2 | Tokuzo Osugi# | 1.03 | 1946-1947 | |
| 3 | Hideshi Igarashi# | 1.04 | 1946-1947 | |
| 4 | Noburo Kagawa# | 1.08 | 1938-1947 | |
| 5 | Zenjiro Yukimoto# | 1.12 | 1946-1947 | |
| 6 | Shojiro Tasaka# | 1.13 | 1938-1947 | |
| 7 | Masahiro Yamashita | 1.15 | 1938-1947 | |
| 8 | Jiro Kuroda# | 1.16 | 1938-1947 | |
| 8 | Heikichi Kawasaki# | 1.16 | 1939-1947 | |
| 10 | Fujio Tanaka# | 1.18 | 1938-1947 | |
| 10 | Shogo Kobayashi | 1.18 | 1938-1946 | |
| 12 | Nariakira Yamada# | 1.19 | 1946-1947 | |
| 13 | Kanichi Yokota | 1.20 | 1939-1943 | |
| 14 | Naski Kanno# | 1.21 | 1946-1947 | |
| 15 | Masanori Onodera | 1.22 | 1938-1947 | |
| 16 | Yusuke Kimura# | 1.24 | 1938-1947 | |
| 17 | Toshio Iwamoto# | 1.25 | 1946-1947 | |
| 17 | Mizuki Maeda | 1.25 | 1938-1943 | |
| 19 | Masakado Goto# | 1.26 | 1938-1947 | |
| 20 | Heiichi Funaki# | 1.27 | 1938-1947 | |
| 20 | Kodai Takeda# | 1.27 | 1940-1947 | |
| 22 | Takuyuki Shimizu# | 1.29 | 1938-1947 | |
| 22 | Ken Yamada# | 1.29 | 1942-1947 | |
| 22 | Mikizo Fukuchi# | 1.29 | 1939-1947 | |
| 25 | Shunzen Terada# | 1.30 | 1941-1947 | |
| 26 | Shinji Nomura | 1.32 | 1938-1947 | |
| 27 | Akahito Takizawa# | 1.33 | 1939-1947 | |
| 28 | Hachiro Ishii | 1.34 | 1939-1942 | |
| 29 | Gou Sawamura# | 1.35 | 1946-1947 | |
| 30 | Hiroyasu Takahashi# | 1.37 | 1938-1947 | |
| 31 | Junichi Furukawa | 1.38 | 1938-1940 | |
| 32 | Minato Shishido# | 1.40 | 1943-1947 | |
| 33 | Kenko Ito | 1.44 | 1938-1943 | |
| 33 | Iori Inouye# | 1.44 | 1944-1947 | |
| 35 | Ryuzo Imai | 1.45 | 1938-1943 | |
| 36 | Satoshi Smith# | 1.46 | 1939-1947 | |
| 37 | Katsushi Iwashita | 1.48 | 1938-1943 | |
| 38 | Shinga Yuasa# | 1.49 | 1946-1947 | |
| 38 | Ryuhei Takahashi | 1.49 | 1938-1940 | |
| 40 | Tadanori Nakagawa# | 1.50 | 1943-1947 | |
| 40 | Satonori Yamasaki# | 1.50 | 1939-1947 | |
| 42 | Tadakatsu Endo# | 1.52 | 1941-1947 | |
| 43 | Ryuusei Sawai# | 1.53 | 1938-1947 | |
| 43 | Hideo Ito# | 1.53 | 1938-1947 | |
| 43 | Matsudaira Susumago# | 1.53 | 1938-1947 | |
| 43 | Masatoshi Yamada | 1.53 | 1938-1943 | |
| 47 | Murai Aso# | 1.54 | 1938-1947 | |
| 48 | Yorikane Sato | 1.57 | 1938-1940 | |
| 49 | Masayoshi Fujiwara | 1.58 | 1938-1941 | |
| 49 | Tomiji Watanabe# | 1.58 | 1939-1947 | |
| 51 | Masami Niinuma# | 1.60 | 1939-1947 | |
| 52 | Toshimichi Uchino# | 1.62 | 1938-1947 | |
| 53 | Tadashi Hirano | 1.63 | 1938-1942 | |
| 54 | Yuushirou Watanabe# | 1.69 | 1941-1947 | |
| 55 | Akiharu Smith# | 1.82 | 1938-1947 | |
| 56 | Toshifumi Nakai | 1.92 | 1938-1943 |
