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| |
| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Kousei Ota# | .5516 | 1960 | |
| 2 | Kousei Ota# | .5470 | 1959 | |
| 3 | Kousei Ota# | .5450 | 1958 | |
| 4 | Kousei Ota# | .5425 | 1957 | |
| 5 | Hiroji Orido# | .5216 | 1960 | |
| 6 | Kousei Ota# | .5142 | 1961 | |
| 7 | Kiyoshi Yamasaki | .4956 | 1952 | |
| 8 | Kazuaki Mukai# | .4839 | 1960 | |
| 9 | Yasushi Mori | .4780 | 1951 | |
| 10 | Kiyoshi Yamasaki | .4664 | 1951 | |
| 11 | Kousei Ota# | .4543 | 1955 | |
| 12 | Hiroji Orido# | .4511 | 1959 | |
| 13 | Kiyohiro Aoyagi# | .4409 | 1961 | |
| 14 | Hiroji Orido# | .4387 | 1958 | |
| 15 | Jokichi Kono# | .4353 | 1961 | |
| 16 | Hiroji Orido# | .4345 | 1961 | |
| 17 | Ikuhiko Murata | .4317 | 1958 | |
| 18 | Tadao Hasegawa# | .4240 | 1959 | |
| 19 | Kazuaki Mukai# | .4193 | 1954 | |
| 20 | Yasushi Mori | .4127 | 1950 | |
| 21 | Yakumo Nishi | .4125 | 1953 | |
| 22 | Hiroji Orido# | .4104 | 1957 | |
| 23 | Tadao Hasegawa# | .4099 | 1961 | |
| 24 | Teiljo Otani# | .4091 | 1958 | |
| 24 | Ikuhiko Murata | .4091 | 1955 | |
| 26 | Kiyohiro Aoyagi# | .4071 | 1960 | |
| 27 | Tadao Hasegawa# | .4037 | 1956 | |
| 28 | Kazuaki Mukai# | .4005 | 1957 | |
| 29 | Kiyoshi Yamasaki | .3985 | 1958 | |
| 30 | Jokichi Kono# | .3981 | 1959 | |
| 31 | Meguru Morioka# | .3897 | 1956 | |
| 32 | Meguru Morioka# | .3892 | 1961 | |
| 33 | Kiyohiro Aoyagi# | .3880 | 1958 | |
| 34 | Shouya Kishimoto | .3879 | 1951 | |
| 35 | Jokichi Kono# | .3820 | 1958 | |
| 36 | William Hancock# | .3787 | 1961 | |
| 37 | Tadao Hasegawa# | .3726 | 1958 | |
| 38 | Michinao Okamoto | .3705 | 1952 | |
| 39 | Teiljo Otani# | .3688 | 1955 | |
| 40 | Kazuaki Mukai# | .3670 | 1961 | |
| 41 | Kazuaki Mukai# | .3640 | 1953 | |
| 42 | Shouya Kishimoto | .3639 | 1950 | |
| 43 | Kazuaki Mukai# | .3614 | 1958 | |
| 44 | William Hancock# | .3582 | 1960 | |
| 44 | Koto Seki# | .3582 | 1960 | |
| 46 | Teiljo Otani# | .3349 | 1956 | |
| 47 | Kazuaki Mukai# | .3333 | 1956 | |
| 48 | Kiyohito Nojima# | .3179 | 1957 | |
| 49 | Kannon Yamamoto# | .3168 | 1955 | |
| 50 | Meguru Morioka# | .3086 | 1957 | |
| 51 | Meguru Morioka# | .2880 | 1959 | |
| 52 | Tadao Hasegawa# | .2823 | 1960 | |
| 53 | Jokichi Kono# | .2819 | 1960 |
