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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 |
| Petri Kallio | 2033-2033 | .328 | 2 | 10 | 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 |
| Dahab Kanda | 2033-2033 | .000 | 0 | 0 | 2 | 2 | 0 | 3.58 | 18 |
| Tetsuzan Kaneko | 2027-2027 | .000 | 0 | 0 | 0 | 6 | 9 | 9.53 | 11 |
| Eikki Kankaanperä | 2034-2034 | .480 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Donat Karczmarek | 2031-2031 | .000 | 0 | 0 | 6 | 6 | 0 | 4.25 | 73 |
| Harith Karim | 2033-2034 | .266 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Karnowski | 2032-2034 | .304 | 26 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Kato | 2027-2029 | .000 | 0 | 0 | 4 | 3 | 4 | 5.77 | 25 |
| Daniel Katz | 2029-2032 | .000 | 0 | 0 | 6 | 2 | 2 | 3.62 | 45 |
| Gerald Kaufman | 2026-2034 | .272 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny Kawaguchi | 2034-2034 | .000 | 0 | 0 | 0 | 2 | 0 | 6.08 | 17 |
| Wing-tat Ke | 2022-2023 | .000 | 0 | 0 | 15 | 12 | 0 | 4.50 | 136 |
| Joe Kehoe | 2030-2030 | .000 | 0 | 0 | 0 | 4 | 2 | 6.61 | 8 |
| 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 | 2022-2031 | .257 | 38 | 227 | 0 | 0 | 0 | 0.00 | 0 |
| Howard Kelly | 2023-2024 | .196 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| King Kelly | 2034-2034 | .000 | 0 | 0 | 3 | 2 | 26 | 2.55 | 36 |
| Thomas Kemp | 2017-2017 | .387 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Jeren Kendall | 2028-2034 | .000 | 0 | 0 | 9 | 17 | 5 | 5.09 | 71 |
| 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 | 2025-2032 | .246 | 6 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Kenney | 2023-2028 | .257 | 16 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Oscar Kenselaar | 2033-2033 | .000 | 0 | 0 | 0 | 0 | 0 | 7.71 | 2 |
| 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 |
| Ma Hon Keung | 2031-2031 | .000 | 0 | 0 | 2 | 2 | 0 | 6.86 | 8 |
| Doruk Keyder | 2033-2033 | .000 | 0 | 0 | 2 | 3 | 0 | 6.47 | 25 |
| 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 |
| Patrick Kilshaw | 2031-2031 | .000 | 0 | 0 | 4 | 0 | 0 | 2.74 | 45 |
| Han-seung Kim | 2018-2020 | .000 | 0 | 0 | 9 | 8 | 0 | 5.20 | 217 |
| Hyeon-cheong Kim | 2034-2034 | .329 | 5 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Song-saeng Kim | 2030-2030 | .000 | 0 | 0 | 2 | 0 | 0 | 6.06 | 14 |
| Shojiro Kimura | 2021-2021 | .319 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Hsi-men King | 2033-2034 | .319 | 20 | 120 | 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 |
| Jon King | 2031-2031 | .000 | 0 | 0 | 6 | 3 | 29 | 2.01 | 51 |
| 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 |
| Will Kirby | 2034-2034 | .000 | 0 | 0 | 1 | 1 | 0 | 4.91 | 8 |
| 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 |
| Shunso Kiyomizu | 2033-2033 | .327 | 8 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Yosuke Kiyomizu | 2016-2020 | .321 | 45 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent Klein | 2026-2032 | .276 | 12 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Carroll Kline | 2017-2023 | .308 | 74 | 235 | 0 | 0 | 0 | 0.00 | 0 |
| Ludwig Kluge | 2021-2033 | .308 | 6 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Knight | 2021-2021 | .333 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Meka Knight | 2025-2031 | .248 | 19 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Knight | 2033-2033 | .000 | 0 | 0 | 1 | 2 | 2 | 7.80 | 22 |
| Tyler Knopp | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kade Knowles | 2022-2023 | .332 | 3 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Naozane Kobayashi | 2032-2034 | .000 | 0 | 0 | 23 | 16 | 0 | 3.94 | 234 |
| Shusaku Kobayashi | 2031-2033 | .000 | 0 | 0 | 1 | 1 | 2 | 4.85 | 16 |
| Steve Koch | 2031-2031 | .354 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny Koehler | 2025-2032 | .000 | 0 | 0 | 19 | 16 | 4 | 4.13 | 271 |
| Masami Kogawa | 2029-2030 | .000 | 0 | 0 | 20 | 12 | 0 | 4.34 | 211 |
| Kenshin Koike | 2018-2028 | .000 | 0 | 0 | 20 | 11 | 0 | 3.30 | 186 |
| Hou Kong | 2033-2033 | .280 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Lu-fang Koo | 2032-2032 | .272 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie Kop | 2023-2023 | .000 | 0 | 0 | 3 | 8 | 0 | 4.18 | 80 |
| John Kraan | 2034-2034 | .000 | 0 | 0 | 1 | 0 | 1 | 0.59 | 11 |
| 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 | 2019-2031 | .000 | 0 | 0 | 2 | 1 | 1 | 4.31 | 21 |
| Jeff Krause | 2017-2027 | .000 | 0 | 0 | 8 | 21 | 4 | 7.52 | 127 |
| Jerry Kumpf | 2031-2031 | .000 | 0 | 0 | 3 | 2 | 0 | 4.61 | 51 |
| Dale Kurth | 2027-2033 | .000 | 0 | 0 | 1 | 2 | 6 | 5.14 | 29 |
| Lester Kwiatkowski | 2032-2032 | .255 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jin Kwon | 2031-2031 | .000 | 0 | 0 | 2 | 3 | 0 | 4.00 | 7 |
| Jung-hwan Kwon | 2028-2033 | .258 | 7 | 46 | 0 | 0 | 0 | 0.00 | 0 |
