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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 | 2025-2026 | .251 | 3 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Huai-yu Kan | 2015-2019 | .000 | 0 | 0 | 11 | 2 | 0 | 2.48 | 137 |
| Manabu Kato | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tamasaburo Kato | 2019-2024 | .332 | 2 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Katz | 2026-2026 | .000 | 0 | 0 | 5 | 5 | 0 | 4.00 | 33 |
| Gerald Kaufman | 2025-2025 | .333 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Ezekiel Kee | 2022-2022 | .000 | 0 | 0 | 1 | 0 | 1 | 4.35 | 2 |
| Joe Kehoe | 2016-2019 | .000 | 0 | 0 | 10 | 14 | 0 | 3.57 | 216 |
| Dempster Kelly | 2025-2026 | .000 | 0 | 0 | 2 | 3 | 6 | 3.40 | 28 |
| Francis Kelly | 2021-2021 | .263 | 2 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Kelly | 2017-2023 | .000 | 0 | 0 | 5 | 15 | 4 | 4.88 | 76 |
| Howard Kelly | 2021-2021 | .245 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Kelly | 2021-2024 | .310 | 10 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Kennedy | 2015-2016 | .286 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Kennerly | 2024-2024 | .203 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Hank Kenney | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Lloyd Kent | 2026-2026 | .250 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Erjan Kerstens | 2020-2025 | .237 | 12 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Millard Kessler | 2016-2016 | .000 | 0 | 0 | 3 | 5 | 0 | 5.86 | 43 |
| Guus Ketting | 2020-2021 | .000 | 0 | 0 | 3 | 7 | 1 | 6.15 | 40 |
| Greg Keys | 2015-2018 | .304 | 21 | 135 | 0 | 0 | 0 | 0.00 | 0 |
| Hirokichi Kichida | 2021-2021 | .000 | 0 | 0 | 1 | 0 | 1 | 0.00 | 11 |
| Wade Killefer | 2024-2026 | .255 | 2 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Dae-il Kim | 2024-2025 | .000 | 0 | 0 | 10 | 14 | 5 | 4.89 | 106 |
| Il-gyung Kim | 2017-2026 | .000 | 0 | 0 | 34 | 41 | 4 | 4.19 | 592 |
| Seon-keun Kim | 2021-2023 | .249 | 14 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Akahele Kimokeo | 2015-2017 | .281 | 11 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Brian King | 2022-2022 | .273 | 5 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Jack King | 2017-2019 | .000 | 0 | 0 | 18 | 14 | 0 | 4.47 | 265 |
| John Kirk | 2018-2024 | .000 | 0 | 0 | 4 | 2 | 7 | 4.35 | 65 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tim Kirk | 2017-2017 | .000 | 0 | 0 | 0 | 2 | 1 | 9.35 | 7 |
| Vincent Klein | 2023-2024 | .263 | 14 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Carroll Kline | 2015-2015 | .273 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Knight | 2026-2026 | .259 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Dwayne Knight | 2019-2019 | .249 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Meka Knight | 2022-2022 | .306 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Kade Knowles | 2020-2021 | .256 | 3 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Kozue Koga | 2020-2022 | .000 | 0 | 0 | 6 | 12 | 0 | 5.92 | 58 |
| Evan Koopman | 2021-2021 | .000 | 0 | 0 | 1 | 0 | 0 | 2.25 | 6 |
| Eddie Kop | 2021-2021 | .000 | 0 | 0 | 2 | 1 | 0 | 3.92 | 13 |
| Josef Koper | 2015-2017 | .313 | 36 | 160 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Kramer | 2019-2019 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Krause | 2015-2016 | .000 | 0 | 0 | 3 | 1 | 4 | 5.86 | 34 |
| Maik Kruidenier | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Yoshida Kudo | 2023-2026 | .000 | 0 | 0 | 5 | 7 | 1 | 5.54 | 49 |
| Yuki Kudo | 2019-2021 | .240 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Tristan Kuhn | 2021-2024 | .290 | 0 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Tiaki Kunani | 2019-2022 | .249 | 5 | 82 | 0 | 0 | 0 | 0.00 | 0 |
