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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Young-tae O | 2022-2023 | 3 | 5 | .375 | 6.71 | 13 | 11 | 0 | 0 | 0 | 56.1 | 67 | 42 | 7 | 32 | 61 |
| Sozui Oda | 2022-2023 | 1 | 1 | .500 | 5.74 | 21 | 5 | 0 | 0 | 1 | 42.1 | 46 | 27 | 8 | 30 | 53 |
| Tsugiharu Oda | 2027-2027 | 6 | 0 | 1.000 | 6.36 | 32 | 0 | 0 | 0 | 0 | 46.2 | 46 | 33 | 6 | 49 | 48 |
| Kozue Ogawa | 2023-2023 | 0 | 0 | .000 | 5.00 | 9 | 0 | 0 | 0 | 1 | 9.0 | 4 | 5 | 3 | 9 | 9 |
| Takeji Ogawa | 2023-2023 | 11 | 4 | .733 | 2.98 | 19 | 19 | 0 | 0 | 0 | 120.2 | 95 | 40 | 8 | 38 | 138 |
| Katsuhito Ohashi | 2024-2025 | 2 | 9 | .182 | 5.43 | 28 | 28 | 0 | 0 | 0 | 134.1 | 137 | 81 | 23 | 72 | 137 |
| Tsuneo Ohashi | 2024-2025 | 4 | 7 | .364 | 5.42 | 21 | 15 | 0 | 0 | 1 | 73.0 | 73 | 44 | 13 | 46 | 77 |
| Hideki Ohayashi | 2015-2015 | 10 | 10 | .500 | 3.08 | 27 | 27 | 0 | 0 | 0 | 166.1 | 133 | 57 | 8 | 52 | 166 |
| Hisashi Ohayashi | 2027-2027 | 4 | 4 | .500 | 5.03 | 13 | 13 | 0 | 0 | 0 | 62.2 | 59 | 35 | 8 | 36 | 52 |
| Jin Ohayashi | 2025-2026 | 4 | 4 | .500 | 5.30 | 18 | 10 | 0 | 0 | 0 | 54.1 | 61 | 32 | 7 | 36 | 51 |
| Kagetoki Ohayashi | 2025-2026 | 5 | 7 | .417 | 3.86 | 24 | 24 | 0 | 0 | 0 | 114.1 | 92 | 49 | 11 | 57 | 138 |
| Koshiro Ohayashi | 2025-2027 | 10 | 12 | .455 | 5.33 | 36 | 36 | 0 | 0 | 0 | 174.0 | 193 | 103 | 17 | 83 | 163 |
| Masaharu Ohayashi | 2026-2026 | 3 | 1 | .750 | 8.28 | 15 | 0 | 0 | 0 | 0 | 29.1 | 38 | 27 | 7 | 25 | 29 |
| Muneyaki Ohayashi | 2024-2025 | 4 | 12 | .250 | 6.54 | 29 | 29 | 0 | 0 | 0 | 129.1 | 137 | 94 | 29 | 83 | 124 |
| Rintaro Ohayashi | 2022-2023 | 2 | 0 | 1.000 | 9.70 | 23 | 0 | 0 | 0 | 0 | 34.1 | 58 | 37 | 7 | 32 | 24 |
| Subaru Ohayashi | 2027-2027 | 3 | 3 | .500 | 3.71 | 12 | 12 | 0 | 0 | 0 | 60.2 | 58 | 25 | 3 | 22 | 66 |
| Taheiji Ohayashi | 2027-2027 | 1 | 4 | .200 | 4.44 | 10 | 10 | 0 | 0 | 0 | 48.2 | 60 | 24 | 5 | 9 | 49 |
| Katsunan Oike | 2026-2026 | 1 | 5 | .167 | 6.96 | 11 | 11 | 0 | 0 | 0 | 42.2 | 53 | 33 | 10 | 39 | 38 |
| Yo Oike | 2023-2024 | 3 | 1 | .750 | 5.31 | 27 | 0 | 0 | 0 | 1 | 42.1 | 45 | 25 | 4 | 30 | 26 |
| Toshiki Oishi | 2026-2026 | 0 | 1 | .000 | 11.00 | 6 | 0 | 0 | 0 | 0 | 9.0 | 11 | 11 | 3 | 10 | 4 |
| Akihisa Ojima | 2024-2025 | 1 | 0 | 1.000 | 8.77 | 27 | 0 | 0 | 0 | 0 | 39.0 | 47 | 38 | 12 | 38 | 40 |
| Kuemon Ojima | 2025-2025 | 0 | 0 | .000 | 7.24 | 6 | 0 | 0 | 0 | 0 | 13.2 | 16 | 11 | 3 | 8 | 16 |
| Naosuke Ojima | 2025-2026 | 1 | 4 | .200 | 6.95 | 23 | 5 | 0 | 0 | 10 | 33.2 | 34 | 26 | 7 | 40 | 45 |
| Shusui Ojima | 2027-2027 | 4 | 1 | .800 | 4.36 | 17 | 4 | 0 | 0 | 1 | 43.1 | 32 | 21 | 6 | 23 | 47 |
| Yoshitora Ojima | 2025-2026 | 1 | 0 | 1.000 | 3.24 | 17 | 0 | 0 | 0 | 0 | 25.0 | 22 | 9 | 3 | 15 | 23 |
| Masayuki Okada | 2014-2014 | 4 | 4 | .500 | 3.65 | 42 | 0 | 0 | 0 | 22 | 44.1 | 43 | 18 | 3 | 16 | 44 |
| Tanyu Okada | 2027-2027 | 0 | 4 | .000 | 7.90 | 24 | 0 | 0 | 0 | 1 | 35.1 | 51 | 31 | 6 | 30 | 38 |
| Yasuhiro Okada | 2022-2023 | 3 | 3 | .500 | 6.14 | 36 | 0 | 0 | 0 | 20 | 36.2 | 36 | 25 | 3 | 22 | 45 |
| Kunitaro Okamoto | 2024-2025 | 0 | 4 | .000 | 6.49 | 27 | 2 | 0 | 0 | 14 | 34.2 | 35 | 25 | 6 | 27 | 34 |
| Isei Okawa | 2027-2027 | 1 | 1 | .500 | 5.06 | 19 | 0 | 0 | 0 | 2 | 26.2 | 18 | 15 | 2 | 20 | 34 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Taroemon Okazawaya | 2025-2026 | 3 | 1 | .750 | 5.13 | 16 | 16 | 0 | 0 | 0 | 79.0 | 79 | 45 | 16 | 39 | 70 |
| Hisato Okubo | 2023-2024 | 12 | 7 | .632 | 3.36 | 29 | 29 | 0 | 0 | 0 | 147.1 | 129 | 55 | 18 | 69 | 165 |
| Masahide Okubo | 2024-2024 | 4 | 6 | .400 | 5.17 | 15 | 15 | 0 | 0 | 0 | 62.2 | 61 | 36 | 8 | 48 | 71 |
| Motonobu Okumura | 2027-2027 | 3 | 2 | .600 | 4.76 | 21 | 0 | 0 | 0 | 11 | 22.2 | 19 | 12 | 2 | 13 | 27 |
| Masayuki Okuta | 2026-2026 | 2 | 3 | .400 | 6.19 | 11 | 11 | 0 | 0 | 0 | 56.2 | 65 | 39 | 11 | 32 | 45 |
| Tanyu Okuta | 2025-2026 | 1 | 2 | .333 | 4.02 | 20 | 0 | 0 | 0 | 2 | 31.1 | 22 | 14 | 3 | 28 | 25 |
| Mito Omichi | 2023-2023 | 1 | 3 | .250 | 5.17 | 10 | 10 | 0 | 0 | 0 | 55.2 | 47 | 32 | 11 | 26 | 65 |
| Shino Omori | 2026-2026 | 2 | 1 | .667 | 3.52 | 19 | 0 | 0 | 0 | 0 | 30.2 | 25 | 12 | 6 | 22 | 34 |
| Katsumi Onishi | 2014-2014 | 1 | 3 | .250 | 1.07 | 43 | 0 | 0 | 0 | 26 | 42.0 | 19 | 5 | 1 | 19 | 67 |
| Takaaki Onishi | 2022-2023 | 1 | 1 | .500 | 9.00 | 37 | 0 | 0 | 0 | 1 | 47.0 | 55 | 47 | 10 | 44 | 46 |
| Takao Onishi | 2014-2014 | 16 | 5 | .762 | 2.69 | 27 | 27 | 0 | 0 | 0 | 180.2 | 133 | 54 | 13 | 18 | 216 |
| Toshiki Onishi | 2022-2023 | 14 | 5 | .737 | 3.49 | 24 | 24 | 0 | 0 | 0 | 154.2 | 121 | 60 | 33 | 30 | 185 |
| Mokichi Ono | 2027-2027 | 0 | 1 | .000 | 2.61 | 21 | 0 | 0 | 0 | 8 | 20.2 | 21 | 6 | 3 | 7 | 28 |
| Shunen Ono | 2025-2026 | 6 | 4 | .600 | 5.53 | 48 | 0 | 0 | 0 | 1 | 81.1 | 88 | 50 | 9 | 64 | 98 |
| Tetsuzan Ono | 2027-2027 | 2 | 3 | .400 | 3.23 | 10 | 10 | 0 | 0 | 0 | 47.1 | 42 | 17 | 7 | 26 | 57 |
| Tsurayuki Ono | 2014-2014 | 3 | 8 | .273 | 6.18 | 23 | 23 | 0 | 0 | 0 | 110.2 | 139 | 76 | 12 | 54 | 124 |
| Rodel Orille | 2018-2019 | 5 | 3 | .625 | 3.97 | 15 | 15 | 0 | 0 | 0 | 77.0 | 71 | 34 | 3 | 42 | 70 |
| Shusaku Osada | 2024-2024 | 1 | 1 | .500 | 5.16 | 20 | 0 | 0 | 0 | 1 | 29.2 | 25 | 17 | 5 | 19 | 44 |
| Takuro Osada | 2025-2026 | 3 | 3 | .500 | 4.75 | 39 | 4 | 0 | 0 | 0 | 47.1 | 36 | 25 | 3 | 31 | 51 |
| Takashi Oshima | 2024-2025 | 1 | 4 | .200 | 7.75 | 16 | 3 | 0 | 0 | 0 | 33.2 | 44 | 29 | 11 | 21 | 30 |
| Eisuke Ota | 2022-2023 | 12 | 13 | .480 | 4.14 | 30 | 30 | 0 | 0 | 0 | 180.1 | 185 | 83 | 23 | 53 | 215 |
| Goro Ota | 2026-2026 | 3 | 2 | .600 | 3.15 | 13 | 13 | 0 | 0 | 0 | 68.2 | 60 | 24 | 8 | 23 | 66 |
| Sadahige Otani | 2025-2025 | 3 | 2 | .600 | 4.00 | 14 | 14 | 0 | 0 | 0 | 69.2 | 65 | 31 | 7 | 24 | 85 |
| Takanibu Otani | 2023-2024 | 0 | 2 | .000 | 8.62 | 24 | 0 | 0 | 0 | 0 | 31.1 | 37 | 30 | 9 | 29 | 33 |
| Yosuke Otani | 2024-2024 | 0 | 0 | .000 | 2.45 | 2 | 0 | 0 | 0 | 0 | 3.2 | 4 | 1 | 0 | 2 | 2 |
| Chun-mei Ou-yang | 2027-2027 | 2 | 1 | .667 | 7.20 | 23 | 0 | 0 | 0 | 1 | 35.0 | 39 | 28 | 12 | 20 | 31 |
| Ye-qing Ou-yang | 2026-2026 | 0 | 0 | .000 | 11.44 | 16 | 0 | 0 | 0 | 0 | 19.2 | 37 | 25 | 5 | 13 | 22 |
| Jin-song Ouyang | 2027-2027 | 3 | 2 | .600 | 4.55 | 13 | 13 | 0 | 0 | 0 | 63.1 | 53 | 32 | 9 | 30 | 78 |
| Yin-ti Ow-Yang | 2018-2019 | 4 | 8 | .333 | 4.73 | 21 | 21 | 0 | 0 | 0 | 116.0 | 135 | 61 | 20 | 45 | 121 |
| Shunsen Oyama | 2025-2026 | 4 | 3 | .571 | 7.57 | 41 | 1 | 0 | 0 | 3 | 54.2 | 58 | 46 | 11 | 41 | 55 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Tsunesaburo Ozaki | 2026-2026 | 4 | 6 | .400 | 7.24 | 32 | 0 | 0 | 0 | 0 | 51.0 | 54 | 41 | 13 | 38 | 57 |
| Kichibei Ozawa | 2022-2022 | 4 | 8 | .333 | 5.07 | 19 | 19 | 0 | 0 | 0 | 104.2 | 104 | 59 | 15 | 41 | 138 |
| Masamune Ozawa | 2027-2027 | 3 | 0 | 1.000 | 5.03 | 25 | 0 | 0 | 0 | 0 | 48.1 | 48 | 27 | 8 | 21 | 46 |
