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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tetsuzan Kaneko | 2021-2023 | 25 | 23 | .521 | 2.89 | 66 | 66 | 7 | 2 | 0 | 464.2 | 387 | 149 | 34 | 117 | 311 |
| Makoto Kato | 2018-2022 | 23 | 18 | .561 | 3.56 | 50 | 50 | 6 | 2 | 0 | 336.1 | 311 | 133 | 33 | 94 | 306 |
| John Keller | 2018-2022 | 12 | 10 | .545 | 3.62 | 167 | 14 | 0 | 0 | 6 | 261.1 | 221 | 105 | 20 | 115 | 219 |
| Bill Kelly | 2015-2023 | 10 | 13 | .435 | 5.16 | 101 | 25 | 0 | 0 | 3 | 259.2 | 300 | 149 | 27 | 115 | 183 |
| Hirokichi Kichida | 2024-2024 | 0 | 4 | .000 | 7.55 | 10 | 10 | 0 | 0 | 0 | 47.2 | 69 | 40 | 5 | 27 | 26 |
| Han-seung Kim | 2023-2024 | 2 | 7 | .222 | 5.47 | 20 | 16 | 0 | 0 | 0 | 77.1 | 90 | 47 | 13 | 31 | 37 |
| Seung-yeop Kim | 2024-2024 | 0 | 0 | .000 | 5.68 | 1 | 1 | 0 | 0 | 0 | 6.1 | 8 | 4 | 1 | 3 | 2 |
| Jack King | 2021-2024 | 9 | 31 | .225 | 6.89 | 58 | 51 | 0 | 0 | 0 | 297.2 | 337 | 228 | 47 | 184 | 241 |
| Rusty King | 2016-2017 | 6 | 6 | .500 | 3.58 | 51 | 12 | 0 | 0 | 17 | 118.0 | 108 | 47 | 8 | 31 | 94 |
| Steve King | 2022-2023 | 1 | 0 | 1.000 | 3.74 | 19 | 0 | 0 | 0 | 0 | 21.2 | 21 | 9 | 2 | 13 | 17 |
| Erwin Koevoet | 2015-2017 | 3 | 3 | .500 | 2.59 | 69 | 0 | 0 | 0 | 0 | 76.1 | 57 | 22 | 4 | 26 | 62 |
| Kenshin Koike | 2018-2024 | 21 | 27 | .438 | 4.25 | 93 | 58 | 4 | 0 | 2 | 396.1 | 418 | 187 | 39 | 146 | 306 |
| Terao Kondo | 2020-2020 | 0 | 5 | .000 | 11.51 | 7 | 4 | 0 | 0 | 0 | 20.1 | 36 | 26 | 2 | 21 | 4 |
