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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Huai-yu Kan | 2015-2019 | 11 | 2 | .846 | 2.48 | 20 | 18 | 0 | 0 | 0 | 130.2 | 100 | 36 | 7 | 31 | 137 |
| Raimo Kangas | 2030-2032 | 11 | 3 | .786 | 2.48 | 31 | 19 | 1 | 1 | 1 | 152.1 | 122 | 42 | 13 | 61 | 147 |
| Manabu Kato | 2026-2029 | 1 | 5 | .167 | 4.85 | 39 | 0 | 0 | 0 | 3 | 52.0 | 52 | 28 | 6 | 34 | 44 |
| Daniel Katz | 2026-2027 | 10 | 10 | .500 | 4.21 | 37 | 26 | 0 | 0 | 0 | 156.0 | 171 | 73 | 9 | 61 | 94 |
| Kenny Kawaguchi | 2029-2029 | 4 | 2 | .667 | 1.24 | 32 | 0 | 0 | 0 | 12 | 36.1 | 20 | 5 | 0 | 17 | 40 |
| Ezekiel Kee | 2022-2022 | 1 | 0 | 1.000 | 4.35 | 7 | 0 | 0 | 0 | 1 | 10.1 | 11 | 5 | 1 | 7 | 2 |
| Joe Kehoe | 2016-2019 | 10 | 14 | .417 | 3.57 | 36 | 36 | 0 | 0 | 0 | 214.1 | 206 | 85 | 19 | 62 | 216 |
| Dempster Kelly | 2025-2027 | 7 | 6 | .538 | 3.08 | 62 | 0 | 0 | 0 | 6 | 108.0 | 98 | 37 | 7 | 49 | 77 |
| Greg Kelly | 2017-2023 | 5 | 15 | .250 | 4.88 | 36 | 25 | 0 | 0 | 4 | 151.1 | 176 | 82 | 6 | 79 | 76 |
| Millard Kessler | 2016-2016 | 3 | 5 | .375 | 5.86 | 41 | 0 | 0 | 0 | 0 | 50.2 | 76 | 33 | 7 | 18 | 43 |
| Guus Ketting | 2020-2029 | 6 | 13 | .316 | 5.57 | 71 | 0 | 0 | 0 | 13 | 84.0 | 88 | 52 | 8 | 74 | 71 |
| Joe Khokar | 2030-2030 | 1 | 3 | .250 | 3.43 | 18 | 0 | 0 | 0 | 6 | 21.0 | 17 | 8 | 1 | 12 | 17 |
| Hirokichi Kichida | 2021-2021 | 1 | 0 | 1.000 | 0.00 | 7 | 0 | 0 | 0 | 1 | 8.2 | 1 | 0 | 0 | 4 | 11 |
| Dae-il Kim | 2024-2025 | 10 | 14 | .417 | 4.89 | 53 | 20 | 1 | 0 | 5 | 171.0 | 179 | 93 | 12 | 110 | 106 |
| Il-gyung Kim | 2017-2026 | 34 | 41 | .453 | 4.19 | 175 | 101 | 2 | 2 | 4 | 655.1 | 631 | 305 | 60 | 324 | 592 |
| Kyung-nam Kim | 2030-2032 | 18 | 8 | .692 | 3.25 | 56 | 39 | 0 | 0 | 0 | 277.1 | 267 | 100 | 19 | 99 | 199 |
| Song-saeng Kim | 2031-2031 | 2 | 2 | .500 | 3.45 | 13 | 6 | 0 | 0 | 1 | 47.0 | 44 | 18 | 3 | 16 | 27 |
| Jack King | 2017-2019 | 18 | 14 | .562 | 4.47 | 42 | 42 | 1 | 0 | 0 | 237.2 | 242 | 118 | 21 | 132 | 265 |
| Jon King | 2030-2030 | 2 | 4 | .333 | 4.05 | 10 | 10 | 0 | 0 | 0 | 60.0 | 59 | 27 | 4 | 26 | 29 |
| John Kirk | 2018-2024 | 4 | 2 | .667 | 4.35 | 55 | 0 | 0 | 0 | 7 | 68.1 | 81 | 33 | 11 | 41 | 65 |
| Tim Kirk | 2017-2017 | 0 | 2 | .000 | 9.35 | 15 | 0 | 0 | 0 | 1 | 8.2 | 11 | 9 | 2 | 6 | 7 |
| Stephen Knight | 2031-2032 | 6 | 8 | .429 | 6.72 | 47 | 2 | 0 | 0 | 15 | 77.2 | 89 | 58 | 11 | 55 | 48 |
| Kozue Koga | 2020-2022 | 6 | 12 | .333 | 5.92 | 57 | 23 | 0 | 0 | 0 | 155.0 | 184 | 102 | 10 | 102 | 58 |
| Evan Koopman | 2021-2021 | 1 | 0 | 1.000 | 2.25 | 5 | 0 | 0 | 0 | 0 | 8.0 | 5 | 2 | 1 | 3 | 6 |
| Eddie Kop | 2021-2021 | 2 | 1 | .667 | 3.92 | 6 | 3 | 0 | 0 | 0 | 20.2 | 21 | 9 | 2 | 12 | 13 |
| Jeff Krause | 2029-2030 | 4 | 0 | 1.000 | 0.82 | 9 | 0 | 0 | 0 | 2 | 22.0 | 15 | 2 | 0 | 7 | 19 |
| Jeff Krause | 2015-2016 | 3 | 1 | .750 | 5.86 | 26 | 3 | 0 | 0 | 4 | 55.1 | 58 | 36 | 6 | 40 | 34 |
| Maik Kruidenier | 2019-2019 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 1.2 | 3 | 0 | 0 | 0 | 2 |
| Yoshida Kudo | 2023-2028 | 15 | 13 | .536 | 4.45 | 108 | 27 | 0 | 0 | 12 | 216.1 | 230 | 107 | 20 | 106 | 120 |
| Toshiharu Kuhabara | 2029-2029 | 3 | 6 | .333 | 4.76 | 14 | 12 | 0 | 0 | 0 | 73.2 | 81 | 39 | 8 | 44 | 63 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Hiro Kurasawa | 2028-2028 | 6 | 1 | .857 | 1.23 | 9 | 9 | 0 | 0 | 0 | 65.2 | 49 | 9 | 1 | 18 | 50 |
| Sun Kwan | 2030-2030 | 0 | 0 | .000 | 5.52 | 6 | 0 | 0 | 0 | 0 | 14.2 | 16 | 9 | 4 | 5 | 9 |
