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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Manabu Kato | 0-2025 | 7 | 5 | .583 | 3.28 | 52 | 0 | 0 | 0 | 12 | 68.2 | 58 | 25 | 5 | 39 | 79 |
| Daniel Katz | 0-2025 | 1 | 2 | .333 | 2.08 | 5 | 5 | 0 | 0 | 0 | 26.0 | 22 | 6 | 2 | 6 | 19 |
| Dempster Kelly | 0-2024 | 0 | 0 | .000 | 2.08 | 23 | 0 | 0 | 0 | 3 | 26.0 | 29 | 6 | 1 | 8 | 34 |
| Greg Kelly | 0-2020 | 3 | 7 | .300 | 2.72 | 15 | 15 | 2 | 1 | 0 | 102.2 | 96 | 31 | 5 | 27 | 100 |
| Rick Kennedy | 0-2024 | 2 | 5 | .286 | 4.27 | 17 | 10 | 0 | 0 | 0 | 71.2 | 85 | 34 | 1 | 37 | 62 |
| Constantino Kent | 1-4 | 6 | 12 | .333 | 4.73 | 54 | 15 | 1 | 0 | 2 | 158.0 | 165 | 83 | 11 | 56 | 166 |
| Guus Ketting | 0-2024 | 8 | 6 | .571 | 2.44 | 93 | 2 | 0 | 0 | 5 | 133.0 | 109 | 36 | 4 | 62 | 166 |
| Chae-seong Kim | 0-2022 | 3 | 3 | .500 | 5.17 | 8 | 8 | 0 | 0 | 0 | 47.0 | 50 | 27 | 0 | 22 | 53 |
| John Kirk | 0-2024 | 2 | 1 | .667 | 1.35 | 17 | 0 | 0 | 0 | 4 | 20.0 | 15 | 3 | 1 | 9 | 26 |
| Kozue Koga | 0-2020 | 4 | 4 | .500 | 3.41 | 8 | 8 | 0 | 0 | 0 | 58.0 | 65 | 22 | 1 | 16 | 43 |
| Evan Koopman | 0-2021 | 0 | 1 | .000 | 2.16 | 14 | 0 | 0 | 0 | 2 | 8.1 | 6 | 2 | 1 | 6 | 4 |
| Eddie Kop | 0-2022 | 7 | 3 | .700 | 2.06 | 13 | 12 | 1 | 1 | 0 | 91.2 | 71 | 21 | 5 | 29 | 93 |
| Maik Kruidenier | 0-2020 | 7 | 5 | .583 | 4.48 | 49 | 5 | 0 | 0 | 3 | 84.1 | 86 | 42 | 6 | 31 | 78 |
| Yoshida Kudo | 1-2023 | 13 | 15 | .464 | 3.64 | 42 | 36 | 0 | 0 | 0 | 197.2 | 216 | 80 | 12 | 47 | 167 |
| Toshiharu Kuhabara | 0-2025 | 4 | 3 | .571 | 2.94 | 23 | 0 | 0 | 0 | 0 | 49.0 | 41 | 16 | 0 | 27 | 47 |
| George Kuhn | 0-2025 | 5 | 11 | .312 | 3.16 | 21 | 21 | 2 | 1 | 0 | 139.2 | 130 | 49 | 4 | 53 | 92 |
