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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 | 2018-2025 | 25 | 23 | .521 | 2.89 | 66 | 66 | 7 | 2 | 0 | 464.2 | 387 | 149 | 34 | 117 | 311 |
| Makoto Kato | 2018-2026 | 23 | 18 | .561 | 3.56 | 50 | 50 | 6 | 2 | 0 | 336.1 | 311 | 133 | 33 | 94 | 306 |
| John Kaufman | 2018-2026 | 20 | 17 | .541 | 3.08 | 45 | 45 | 9 | 2 | 0 | 330.1 | 252 | 113 | 23 | 116 | 307 |
| Wing-tat Ke | 2026-2027 | 5 | 0 | 1.000 | 4.24 | 31 | 0 | 0 | 0 | 1 | 68.0 | 69 | 32 | 13 | 37 | 35 |
| Joe Kehoe | 2020-2026 | 12 | 4 | .750 | 3.13 | 34 | 25 | 0 | 0 | 2 | 152.1 | 116 | 53 | 13 | 56 | 99 |
| John Keller | 2018-2025 | 18 | 11 | .621 | 3.28 | 222 | 14 | 0 | 0 | 7 | 329.2 | 269 | 120 | 24 | 159 | 293 |
| 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 |
| Il-young Kim | 2025-2028 | 15 | 11 | .577 | 2.27 | 174 | 0 | 0 | 0 | 15 | 198.1 | 159 | 50 | 11 | 73 | 155 |
| Seung-yeop Kim | 2024-2028 | 13 | 13 | .500 | 4.46 | 121 | 8 | 0 | 0 | 7 | 177.2 | 179 | 88 | 19 | 71 | 108 |
| Jack King | 2021-2028 | 9 | 31 | .225 | 6.61 | 72 | 51 | 0 | 0 | 0 | 322.2 | 357 | 237 | 47 | 197 | 258 |
| Rusty King | 2016-2020 | 6 | 6 | .500 | 3.58 | 51 | 12 | 0 | 0 | 17 | 118.0 | 108 | 47 | 8 | 31 | 94 |
| Steve King | 2017-2023 | 1 | 0 | 1.000 | 3.74 | 19 | 0 | 0 | 0 | 0 | 21.2 | 21 | 9 | 2 | 13 | 17 |
| Terry King | 2025-2028 | 14 | 14 | .500 | 3.67 | 80 | 34 | 0 | 0 | 1 | 296.2 | 254 | 121 | 29 | 129 | 207 |
| Erwin Koevoet | 2015-2017 | 3 | 3 | .500 | 2.59 | 69 | 0 | 0 | 0 | 0 | 76.1 | 57 | 22 | 4 | 26 | 62 |
| Kenshin Koike | 2018-2027 | 36 | 48 | .429 | 4.27 | 153 | 102 | 6 | 0 | 2 | 685.2 | 697 | 325 | 71 | 259 | 507 |
| Terao Kondo | 2020-2020 | 0 | 5 | .000 | 11.51 | 7 | 4 | 0 | 0 | 0 | 20.1 | 36 | 26 | 2 | 21 | 4 |
| Eddie Kop | 2026-2027 | 11 | 5 | .688 | 2.25 | 23 | 23 | 3 | 2 | 0 | 163.2 | 141 | 41 | 4 | 35 | 146 |
| Ole Kos | 2018-2028 | 0 | 1 | .000 | 6.97 | 8 | 0 | 0 | 0 | 2 | 10.1 | 11 | 8 | 1 | 5 | 15 |
| Jeff Krause | 2028-2028 | 2 | 0 | 1.000 | 3.47 | 18 | 0 | 0 | 0 | 1 | 36.1 | 39 | 14 | 3 | 11 | 13 |
| Jeff Krause | 2028-2028 | 0 | 12 | .000 | 10.63 | 21 | 14 | 0 | 0 | 0 | 84.2 | 144 | 100 | 13 | 68 | 19 |
