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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tsuneyo Kakutama | 2018-2025 | 20 | 9 | .690 | 4.56 | 233 | 2 | 0 | 0 | 6 | 363.1 | 389 | 184 | 49 | 157 | 259 |
| Kazuhiko Kanno | 2013-2027 | 91 | 130 | .412 | 5.68 | 371 | 316 | 12 | 2 | 2 | 1896.1 | 2222 | 1197 | 316 | 778 | 1430 |
| Gesang Kartosuwiryo | 2025-2027 | 0 | 1 | .000 | 18.00 | 5 | 0 | 0 | 0 | 0 | 5.0 | 15 | 10 | 4 | 1 | 3 |
| Ajdir Kasakya | 2024-2027 | 19 | 18 | .514 | 3.70 | 214 | 0 | 0 | 0 | 64 | 245.2 | 215 | 101 | 33 | 92 | 268 |
| Mulia Kathirithamby | 2023-2027 | 10 | 7 | .588 | 4.19 | 212 | 0 | 0 | 0 | 38 | 273.0 | 279 | 127 | 34 | 84 | 248 |
| Tadasuke Kato | 2018-2027 | 70 | 94 | .427 | 5.20 | 256 | 216 | 2 | 1 | 0 | 1271.0 | 1597 | 734 | 238 | 279 | 895 |
| John Keith | 2020-2026 | 29 | 31 | .483 | 5.52 | 170 | 63 | 3 | 0 | 2 | 573.2 | 693 | 352 | 53 | 247 | 278 |
| Justin Keller | 2017-2017 | 0 | 1 | .000 | 3.46 | 2 | 2 | 0 | 0 | 0 | 13.0 | 12 | 5 | 1 | 10 | 8 |
| Joseph Kelley | 2025-2027 | 3 | 1 | .750 | 3.35 | 89 | 0 | 0 | 0 | 2 | 94.0 | 90 | 35 | 9 | 38 | 85 |
| Joe Kenner | 2021-2021 | 4 | 3 | .571 | 5.87 | 12 | 8 | 0 | 0 | 1 | 53.2 | 58 | 35 | 10 | 21 | 29 |
| Moritz Kenter | 2026-2026 | 0 | 0 | .000 | 8.53 | 3 | 0 | 0 | 0 | 0 | 6.1 | 15 | 6 | 1 | 2 | 3 |
| Davey Kerracher | 2017-2021 | 1 | 0 | 1.000 | 4.12 | 68 | 0 | 0 | 0 | 3 | 111.1 | 107 | 51 | 14 | 42 | 85 |
| Kalidas Keskar | 2023-2027 | 7 | 16 | .304 | 5.95 | 50 | 24 | 1 | 0 | 1 | 186.0 | 242 | 123 | 21 | 64 | 93 |
| Abdul Razzaq Kharoti | 2024-2027 | 20 | 15 | .571 | 2.86 | 204 | 0 | 0 | 0 | 93 | 226.1 | 192 | 72 | 9 | 80 | 252 |
| Nakamaro Kichida | 2025-2025 | 1 | 0 | 1.000 | 9.72 | 7 | 0 | 0 | 0 | 0 | 8.1 | 17 | 9 | 3 | 3 | 8 |
| Yoriyuki Kichida | 2025-2025 | 1 | 0 | 1.000 | 10.36 | 16 | 2 | 0 | 0 | 0 | 24.1 | 42 | 28 | 6 | 10 | 9 |
| Suezo Kikuchi | 2020-2023 | 1 | 2 | .333 | 7.67 | 70 | 0 | 0 | 0 | 1 | 27.0 | 37 | 23 | 3 | 15 | 11 |
| Yeong-suk Kim | 2024-2027 | 23 | 43 | .348 | 5.94 | 92 | 85 | 0 | 0 | 0 | 450.0 | 499 | 297 | 67 | 171 | 320 |
| Jeff Kimball | 2020-2027 | 91 | 60 | .603 | 4.07 | 234 | 222 | 9 | 3 | 2 | 1394.1 | 1651 | 631 | 122 | 237 | 795 |
| Jun'ichi Kimura | 2022-2025 | 4 | 5 | .444 | 6.75 | 57 | 9 | 0 | 0 | 1 | 101.1 | 145 | 76 | 17 | 48 | 43 |
| Jim King | 2018-2020 | 2 | 2 | .500 | 8.45 | 37 | 0 | 0 | 0 | 0 | 54.1 | 85 | 51 | 10 | 23 | 28 |
| Leon King | 2015-2027 | 57 | 35 | .620 | 3.38 | 802 | 0 | 0 | 0 | 72 | 893.1 | 799 | 335 | 86 | 362 | 874 |
| Victor Kirkland | 2018-2020 | 6 | 9 | .400 | 5.40 | 50 | 15 | 3 | 0 | 1 | 148.1 | 159 | 89 | 40 | 37 | 91 |
| Peter Klein | 2012-2022 | 57 | 44 | .564 | 3.67 | 692 | 40 | 0 | 0 | 52 | 1025.0 | 1029 | 418 | 47 | 372 | 845 |
| Kakuzo Kobayashi | 2027-2027 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 0 | 4.0 | 5 | 0 | 1 | 0 | 6 |
| Toshiki Koda | 2016-2027 | 62 | 74 | .456 | 5.55 | 297 | 175 | 0 | 0 | 8 | 1114.0 | 1266 | 687 | 138 | 450 | 673 |
| Kojuro Kojima | 2025-2027 | 0 | 4 | .000 | 7.42 | 30 | 8 | 0 | 0 | 2 | 60.2 | 73 | 50 | 12 | 38 | 52 |
| Matsuyo Kokawa | 2019-2019 | 0 | 0 | .000 | 5.23 | 15 | 0 | 0 | 0 | 0 | 31.0 | 28 | 18 | 5 | 15 | 15 |
| Masuhiro Kondo | 2021-2021 | 1 | 0 | 1.000 | 4.78 | 11 | 0 | 0 | 0 | 0 | 26.1 | 36 | 14 | 8 | 7 | 19 |
| Gerard Kotas | 2027-2027 | 2 | 3 | .400 | 5.10 | 12 | 12 | 0 | 0 | 0 | 60.0 | 72 | 34 | 7 | 7 | 47 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Naofumi Kouda | 2015-2021 | 15 | 14 | .517 | 5.13 | 347 | 0 | 0 | 0 | 41 | 395.0 | 380 | 225 | 70 | 193 | 438 |
| Kazuhiro Kouno | 2022-2025 | 7 | 8 | .467 | 9.42 | 34 | 14 | 0 | 0 | 0 | 99.1 | 174 | 104 | 38 | 29 | 76 |
| Clement Kramer | 2019-2021 | 5 | 16 | .238 | 8.39 | 91 | 20 | 0 | 0 | 1 | 197.1 | 305 | 184 | 37 | 93 | 92 |
| Bing-de Ku | 2027-2027 | 2 | 0 | 1.000 | 4.79 | 23 | 0 | 0 | 0 | 0 | 47.0 | 48 | 25 | 3 | 23 | 38 |
| Oda Kudo | 2018-2027 | 90 | 84 | .517 | 5.68 | 325 | 241 | 9 | 0 | 2 | 1623.0 | 1972 | 1024 | 390 | 239 | 1442 |
| Anenas Kunwarjit | 2022-2027 | 9 | 15 | .375 | 6.68 | 147 | 10 | 1 | 0 | 4 | 268.0 | 323 | 199 | 33 | 121 | 141 |
| Gusti Kusuma | 2027-2027 | 4 | 0 | 1.000 | 4.31 | 36 | 0 | 0 | 0 | 3 | 54.1 | 54 | 26 | 6 | 21 | 37 |
