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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 | 2024-2024 | .216 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Toby Kamin | 2025-2026 | .230 | 10 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Kappes | 2017-2018 | .275 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Donat Karczmarek | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 3 |
| Harith Karim | 2029-2029 | .278 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Alexandre Keeping | 2028-2028 | .285 | 4 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Kellenberger | 2028-2028 | .000 | 0 | 0 | 5 | 5 | 0 | 2.44 | 58 |
| John Keller | 2015-2016 | .000 | 0 | 0 | 4 | 7 | 26 | 5.02 | 64 |
| Francis Kelly | 2022-2022 | .259 | 2 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Howard Kelly | 2022-2022 | .214 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Morton Kelly | 2019-2020 | .315 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Jeren Kendall | 2026-2027 | .000 | 0 | 0 | 6 | 6 | 0 | 4.05 | 75 |
| Mark Kennedy | 2021-2021 | .243 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Kennedy | 2023-2023 | .000 | 0 | 0 | 4 | 4 | 3 | 5.47 | 46 |
| Ben Kennerly | 2025-2025 | .278 | 16 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Kenney | 2023-2023 | .275 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Hank Kenney | 2020-2022 | .276 | 6 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Lloyd Kent | 2028-2028 | .240 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Kerin | 2025-2026 | .231 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Erjan Kerstens | 2026-2026 | .272 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Millard Kessler | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 2 |
| Guus Ketting | 2025-2025 | .000 | 0 | 0 | 4 | 1 | 0 | 4.10 | 35 |
| Mark Keys | 2027-2027 | .270 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Keys | 2027-2027 | .000 | 0 | 0 | 1 | 4 | 2 | 4.66 | 39 |
| Tim Keys | 2015-2016 | .000 | 0 | 0 | 2 | 3 | 1 | 6.22 | 49 |
| Kyeong-min Ki | 2018-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 3.10 | 27 |
| Hirokichi Kichida | 2018-2020 | .000 | 0 | 0 | 22 | 21 | 0 | 4.14 | 397 |
| Jong-duk Kim | 2015-2015 | .337 | 4 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Arlen King | 2015-2021 | .275 | 34 | 165 | 0 | 0 | 0 | 0.00 | 0 |
| Brian King | 2018-2018 | .277 | 12 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jack King | 2025-2026 | .000 | 0 | 0 | 16 | 15 | 0 | 3.72 | 223 |
| Joe King | 2019-2019 | .000 | 0 | 0 | 2 | 5 | 0 | 4.92 | 58 |
| Terry King | 2022-2022 | .000 | 0 | 0 | 1 | 0 | 0 | 6.43 | 6 |
| Tim Kirk | 2015-2016 | .000 | 0 | 0 | 4 | 2 | 12 | 4.67 | 41 |
| Shohei Kiyomizu | 2023-2023 | .284 | 5 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Yosuke Kiyomizu | 2016-2016 | .312 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent Klein | 2025-2029 | .261 | 25 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Carroll Kline | 2020-2023 | .307 | 41 | 194 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Knight | 2027-2027 | .244 | 11 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Meka Knight | 2025-2025 | .341 | 8 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Koch | 2027-2027 | .253 | 2 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Kozue Koga | 2023-2024 | .000 | 0 | 0 | 3 | 7 | 0 | 4.02 | 66 |
| Terao Kondo | 2019-2019 | .000 | 0 | 0 | 1 | 3 | 0 | 6.57 | 63 |
| Evan Koopman | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 2 | 12.06 | 6 |
| Eddie Kop | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 5 |
| Riemer Kos | 2027-2027 | .000 | 0 | 0 | 1 | 0 | 1 | 3.35 | 24 |
| Yoshi Kouda | 2029-2029 | .244 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Kramer | 2019-2020 | .317 | 17 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Kramer | 2016-2017 | .000 | 0 | 0 | 6 | 9 | 12 | 4.92 | 102 |
| Jeff Krause | 2017-2018 | .000 | 0 | 0 | 2 | 3 | 0 | 5.35 | 36 |
| Tristan Kuhn | 2018-2020 | .250 | 7 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Dale Kurth | 2027-2027 | .000 | 0 | 0 | 1 | 2 | 1 | 2.54 | 40 |
| Jung-hwan Kwon | 2023-2023 | .240 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
