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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jack Kaiser | 2021-2035 | 13 | 10 | .565 | 5.73 | 36 | 32 | 4 | 0 | 0 | 198.0 | 212 | 126 | 24 | 73 | 184 |
| Kendrick Kaler | 2013-2021 | 14 | 9 | .609 | 3.24 | 38 | 27 | 5 | 1 | 0 | 217.0 | 182 | 78 | 15 | 41 | 161 |
| Tatsuya Kan | 2032-2035 | 7 | 9 | .438 | 2.51 | 95 | 2 | 0 | 0 | 13 | 129.0 | 125 | 36 | 5 | 31 | 86 |
| Richard Kane | 2013-2020 | 10 | 12 | .455 | 5.49 | 203 | 2 | 0 | 0 | 7 | 364.0 | 418 | 222 | 41 | 214 | 143 |
| John Kautz | 2014-2027 | 37 | 18 | .673 | 3.67 | 87 | 80 | 3 | 1 | 0 | 531.2 | 496 | 217 | 34 | 207 | 441 |
| Merlin Keller | 2033-2035 | 9 | 20 | .310 | 5.96 | 53 | 35 | 1 | 0 | 0 | 226.2 | 265 | 150 | 36 | 115 | 145 |
| Louis Kennelly | 2016-2016 | 0 | 1 | .000 | 3.24 | 15 | 0 | 0 | 0 | 0 | 25.0 | 25 | 9 | 0 | 10 | 16 |
| Bill Kennemer | 2014-2018 | 10 | 16 | .385 | 5.21 | 85 | 22 | 5 | 2 | 6 | 269.1 | 314 | 156 | 24 | 123 | 176 |
| Porter Kent | 2027-2031 | 20 | 23 | .465 | 4.21 | 104 | 47 | 2 | 2 | 0 | 344.1 | 358 | 161 | 30 | 116 | 250 |
| Kevin Kepner | 2015-2028 | 5 | 2 | .714 | 3.78 | 9 | 9 | 2 | 0 | 0 | 66.2 | 70 | 28 | 7 | 7 | 57 |
| Yorikane Kichikawa | 2024-2024 | 1 | 1 | .500 | 6.57 | 2 | 2 | 0 | 0 | 0 | 12.1 | 13 | 9 | 3 | 10 | 10 |
| Jung-hoon Kim | 2025-2028 | 19 | 10 | .655 | 5.82 | 171 | 0 | 0 | 0 | 2 | 239.2 | 288 | 155 | 12 | 103 | 155 |
| Kwang-sub Kim | 2021-2029 | 8 | 6 | .571 | 2.51 | 95 | 0 | 0 | 0 | 30 | 100.1 | 102 | 28 | 5 | 26 | 91 |
| Sugita Kimura | 2027-2034 | 31 | 18 | .633 | 3.86 | 100 | 62 | 0 | 0 | 0 | 445.1 | 434 | 191 | 34 | 206 | 297 |
| Jeff King | 2020-2029 | 6 | 10 | .375 | 4.11 | 138 | 0 | 0 | 0 | 10 | 153.1 | 170 | 70 | 12 | 51 | 109 |
| Dave Klein | 2023-2024 | 10 | 13 | .435 | 4.10 | 36 | 36 | 0 | 0 | 0 | 234.2 | 213 | 107 | 22 | 114 | 207 |
| Jack Knapp | 2028-2034 | 35 | 22 | .614 | 3.42 | 75 | 75 | 0 | 0 | 0 | 463.1 | 438 | 176 | 53 | 102 | 333 |
| John Knight | 2031-2035 | 17 | 16 | .515 | 3.68 | 48 | 48 | 4 | 1 | 0 | 320.2 | 311 | 131 | 28 | 79 | 265 |
| Jim Knowles | 2022-2035 | 11 | 17 | .393 | 3.59 | 140 | 11 | 0 | 0 | 48 | 200.1 | 198 | 80 | 22 | 61 | 149 |
| Kyung-bok Ko | 2034-2035 | 7 | 15 | .318 | 3.38 | 35 | 34 | 0 | 0 | 0 | 167.2 | 139 | 63 | 19 | 72 | 124 |
| Anthony Koepp | 2019-2020 | 14 | 8 | .636 | 4.45 | 29 | 29 | 1 | 0 | 0 | 188.0 | 189 | 93 | 16 | 63 | 123 |
| Gerwin Kos | 2021-2026 | 3 | 8 | .273 | 4.86 | 104 | 0 | 0 | 0 | 23 | 113.0 | 134 | 61 | 9 | 39 | 63 |
| Norogumi Kozawa | 2033-2035 | 25 | 26 | .490 | 4.16 | 75 | 75 | 2 | 0 | 0 | 478.0 | 477 | 221 | 44 | 184 | 368 |
| Kien Kuo | 2030-2032 | 4 | 1 | .800 | 4.73 | 59 | 0 | 0 | 0 | 5 | 112.1 | 116 | 59 | 19 | 42 | 64 |
