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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Reginald Kalkman | 2022-2023 | .100 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Kamen | 2025-2025 | .254 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Manabu Kato | 2024-2025 | .000 | 0 | 0 | 7 | 5 | 12 | 3.28 | 79 |
| Tamasaburo Kato | 2024-2024 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Addie Kattenberg | 2023-2025 | .222 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Katz | 2025-2025 | .000 | 0 | 0 | 1 | 2 | 0 | 2.08 | 19 |
| Gerald Kaufman | 2024-2025 | .249 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Dempster Kelly | 2023-2024 | .000 | 0 | 0 | 0 | 0 | 3 | 2.08 | 34 |
| Francis Kelly | 2021-2021 | .270 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Kelly | 2020-2020 | .000 | 0 | 0 | 3 | 7 | 0 | 2.72 | 100 |
| Mike Kelly | 2020-2020 | .286 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Kennedy | 2022-2022 | .000 | 0 | 0 | 2 | 5 | 0 | 4.27 | 62 |
| Ben Kennerly | 2024-2024 | .218 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Constantino Kent | 2023-2025 | .000 | 0 | 0 | 6 | 12 | 2 | 4.73 | 166 |
| Guus Ketting | 2020-2024 | .000 | 0 | 0 | 8 | 6 | 5 | 2.44 | 166 |
| Mark Keys | 2025-2025 | .137 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Wade Killefer | 2023-2025 | .260 | 3 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Chae-seong Kim | 2022-2022 | .000 | 0 | 0 | 3 | 3 | 0 | 5.17 | 53 |
| Seon-keun Kim | 2020-2020 | .277 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Brian King | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| John Kirk | 2020-2021 | .000 | 0 | 0 | 2 | 1 | 4 | 1.35 | 26 |
| Willis Kirkendall | 2024-2024 | .178 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Motoshige Kitamura | 2025-2025 | .286 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Shohei Kiyomizu | 2021-2022 | .248 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent Klein | 2022-2022 | .234 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Knight | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Meka Knight | 2022-2023 | .254 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Kozue Koga | 2020-2020 | .000 | 0 | 0 | 4 | 4 | 0 | 3.41 | 43 |
| Evan Koopman | 2021-2021 | .000 | 0 | 0 | 0 | 1 | 2 | 2.16 | 4 |
| Eddie Kop | 2021-2021 | .000 | 0 | 0 | 7 | 3 | 0 | 2.06 | 93 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Paddy Kos | 2024-2024 | .261 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Wilbur Kramer | 2025-2025 | .220 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Maik Kruidenier | 2021-2022 | .000 | 0 | 0 | 7 | 5 | 3 | 4.48 | 78 |
| Yoshida Kudo | 2021-2023 | .000 | 0 | 0 | 13 | 15 | 0 | 3.64 | 167 |
| Yuki Kudo | 2020-2022 | .277 | 9 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Toshiharu Kuhabara | 2025-2025 | .000 | 0 | 0 | 4 | 3 | 0 | 2.94 | 47 |
| George Kuhn | 2022-2022 | .000 | 0 | 0 | 5 | 11 | 0 | 3.16 | 92 |
| Jung-hwan Kwon | 2020-2022 | .237 | 6 | 92 | 0 | 0 | 0 | 0.00 | 0 |
