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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 |
|---|---|---|---|---|---|---|---|---|---|
| Reggie Kahn | 2021-2022 | .242 | 7 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Reginald Kalkman | 2028-2028 | .270 | 0 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Toby Kamin | 2026-2029 | .182 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Xie-li Kan | 2020-2021 | .276 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Tetsuzan Kaneko | 2027-2027 | .000 | 0 | 0 | 0 | 6 | 9 | 9.53 | 11 |
| Makoto Kato | 2027-2029 | .000 | 0 | 0 | 4 | 3 | 4 | 5.77 | 25 |
| Daniel Katz | 2029-2029 | .000 | 0 | 0 | 2 | 1 | 0 | 4.45 | 15 |
| Gerald Kaufman | 2026-2027 | .276 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Wing-tat Ke | 2022-2023 | .000 | 0 | 0 | 15 | 12 | 0 | 4.50 | 136 |
| John Keller | 2016-2026 | .000 | 0 | 0 | 14 | 14 | 21 | 3.84 | 153 |
| Bill Kelly | 2019-2019 | .000 | 0 | 0 | 5 | 7 | 0 | 5.09 | 90 |
| Dempster Kelly | 2029-2029 | .000 | 0 | 0 | 2 | 3 | 2 | 4.39 | 38 |
| Francis Kelly | 2022-2027 | .254 | 35 | 206 | 0 | 0 | 0 | 0.00 | 0 |
| Howard Kelly | 2023-2024 | .196 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Thomas Kemp | 2017-2017 | .387 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Jeren Kendall | 2028-2028 | .000 | 0 | 0 | 2 | 5 | 4 | 3.79 | 22 |
| Mark Kennedy | 2018-2018 | .275 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Kennedy | 2028-2028 | .000 | 0 | 0 | 4 | 2 | 1 | 5.15 | 33 |
| Ron Kennedy | 2018-2020 | .000 | 0 | 0 | 8 | 6 | 2 | 4.93 | 102 |
| Ben Kennerly | 2025-2028 | .232 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Kenney | 2023-2028 | .257 | 16 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Kerin | 2026-2026 | .258 | 5 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Millard Kessler | 2017-2022 | .000 | 0 | 0 | 19 | 12 | 11 | 4.56 | 195 |
| Guus Ketting | 2028-2028 | .000 | 0 | 0 | 1 | 0 | 0 | 5.89 | 19 |
| Tim Keys | 2016-2016 | .000 | 0 | 0 | 5 | 3 | 1 | 7.39 | 59 |
| Kyeong-min Ki | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 4.80 | 14 |
| Han-seung Kim | 2018-2020 | .000 | 0 | 0 | 9 | 8 | 0 | 5.20 | 217 |
| Joong-geun Kim | 2024-2024 | .000 | 0 | 0 | 1 | 1 | 1 | 2.79 | 11 |
| Jung-hoon Kim | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Shojiro Kimura | 2021-2021 | .319 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tanyu Kimura | 2018-2019 | .316 | 38 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| Tetsunori Kimura | 2028-2028 | .250 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Brian King | 2019-2019 | .237 | 11 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Dave King | 2027-2029 | .270 | 10 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Jack King | 2025-2025 | .000 | 0 | 0 | 2 | 0 | 0 | 1.93 | 21 |
| Joe King | 2017-2021 | .000 | 0 | 0 | 15 | 12 | 0 | 4.53 | 186 |
| Steve King | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 6.94 | 8 |
| Zach King | 2017-2021 | .305 | 22 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Walter Kirk | 2021-2022 | .336 | 7 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Motoshige Kitamura | 2021-2022 | .255 | 6 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Shohei Kiyomizu | 2024-2026 | .250 | 18 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Yosuke Kiyomizu | 2016-2020 | .321 | 45 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent Klein | 2026-2028 | .247 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Carroll Kline | 2017-2023 | .308 | 74 | 235 | 0 | 0 | 0 | 0.00 | 0 |
| Ludwig Kluge | 2021-2021 | .290 | 4 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Knight | 2021-2021 | .333 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Meka Knight | 2025-2027 | .248 | 19 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Kade Knowles | 2022-2023 | .332 | 3 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny Koehler | 2025-2025 | .000 | 0 | 0 | 9 | 4 | 0 | 3.78 | 112 |
| Masami Kogawa | 2029-2029 | .000 | 0 | 0 | 10 | 5 | 0 | 3.97 | 98 |
| Kenshin Koike | 2018-2028 | .000 | 0 | 0 | 20 | 11 | 0 | 3.30 | 186 |
| Eddie Kop | 2023-2023 | .000 | 0 | 0 | 3 | 8 | 0 | 4.18 | 80 |
| Carlos Kramer | 2019-2025 | .312 | 6 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Kramer | 2015-2016 | .000 | 0 | 0 | 1 | 0 | 0 | 5.76 | 32 |
| Jeff Krause | 2019-2028 | .000 | 0 | 0 | 1 | 0 | 0 | 2.50 | 18 |
| Jeff Krause | 2017-2027 | .000 | 0 | 0 | 8 | 21 | 4 | 7.52 | 127 |
| Dale Kurth | 2027-2027 | .000 | 0 | 0 | 0 | 1 | 1 | 7.50 | 17 |
| Jung-hwan Kwon | 2028-2028 | .274 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
