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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Richard Kaczmarek | 2002-2008 | 18 | 38 | .321 | 5.23 | 441 | 0 | 0 | 0 | 18 | 440.1 | 463 | 256 | 12 | 259 | 299 |
| Jack Kaiser | 2023-2035 | 106 | 129 | .451 | 5.23 | 465 | 305 | 29 | 2 | 6 | 2145.1 | 2467 | 1246 | 433 | 518 | 1769 |
| Kendrick Kaler | 2014-2020 | 57 | 55 | .509 | 4.41 | 151 | 151 | 21 | 4 | 0 | 1006.1 | 1025 | 493 | 130 | 273 | 595 |
| Tatsuya Kan | 2031-2035 | 4 | 10 | .286 | 5.67 | 103 | 0 | 0 | 0 | 12 | 92.0 | 109 | 58 | 11 | 32 | 56 |
| Richard Kane | 2013-2015 | 0 | 0 | .000 | 3.48 | 11 | 0 | 0 | 0 | 5 | 10.1 | 13 | 4 | 1 | 5 | 5 |
| John Kautz | 2017-2027 | 101 | 117 | .463 | 4.83 | 346 | 293 | 12 | 4 | 0 | 1696.0 | 1850 | 911 | 211 | 731 | 1353 |
| Louis Kennelly | 2016-2016 | 0 | 0 | .000 | 5.40 | 5 | 0 | 0 | 0 | 0 | 5.0 | 8 | 3 | 1 | 2 | 2 |
| Porter Kent | 2028-2029 | 0 | 0 | .000 | 13.50 | 3 | 0 | 0 | 0 | 0 | 2.2 | 5 | 4 | 2 | 3 | 1 |
| Kevin Kepner | 2015-2031 | 167 | 145 | .535 | 4.36 | 640 | 368 | 48 | 10 | 4 | 2734.1 | 2837 | 1324 | 385 | 800 | 2169 |
| Yorikane Kichikawa | 2024-2035 | 154 | 125 | .552 | 4.02 | 398 | 333 | 46 | 11 | 2 | 2377.2 | 2243 | 1062 | 253 | 839 | 2096 |
| Tetsuichirou Kikugoro | 2002-2008 | 46 | 46 | .500 | 4.92 | 190 | 126 | 1 | 0 | 1 | 804.1 | 851 | 440 | 36 | 328 | 701 |
| Kwang-sub Kim | 2021-2035 | 48 | 52 | .480 | 4.27 | 738 | 0 | 0 | 0 | 76 | 857.1 | 912 | 407 | 102 | 268 | 654 |
| Sugita Kimura | 2032-2035 | 13 | 12 | .520 | 4.16 | 70 | 29 | 0 | 0 | 0 | 259.2 | 233 | 120 | 31 | 138 | 174 |
| Jeff King | 2020-2027 | 17 | 24 | .415 | 5.85 | 293 | 10 | 0 | 0 | 4 | 334.0 | 402 | 217 | 56 | 137 | 213 |
| Ronald Kirkwood | 2002-2011 | 81 | 98 | .453 | 4.20 | 286 | 253 | 12 | 3 | 0 | 1703.2 | 1708 | 795 | 115 | 427 | 976 |
| Dave Klein | 2022-2035 | 137 | 137 | .500 | 4.13 | 362 | 359 | 15 | 4 | 0 | 2272.0 | 2286 | 1042 | 293 | 702 | 2138 |
| Jack Knapp | 2030-2033 | 12 | 21 | .364 | 6.37 | 58 | 51 | 0 | 0 | 0 | 272.2 | 351 | 193 | 42 | 129 | 145 |
| John Knight | 2032-2034 | 25 | 20 | .556 | 4.25 | 60 | 60 | 12 | 3 | 0 | 402.1 | 396 | 190 | 59 | 158 | 315 |
| Jim Knowles | 2023-2035 | 78 | 40 | .661 | 4.04 | 476 | 99 | 1 | 1 | 15 | 977.0 | 1021 | 439 | 124 | 207 | 690 |
| Anthony Koepp | 2011-2019 | 85 | 98 | .464 | 4.56 | 250 | 250 | 1 | 0 | 0 | 1455.1 | 1425 | 738 | 133 | 669 | 879 |
| Gerwin Kos | 2020-2022 | 7 | 5 | .583 | 5.53 | 136 | 0 | 0 | 0 | 2 | 156.1 | 183 | 96 | 28 | 69 | 83 |
| Norogumi Kozawa | 2033-2033 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.0 | 0 | 0 | 0 | 1 | 0 |
| Wesley Kumar | 2009-2015 | 57 | 69 | .452 | 4.56 | 227 | 170 | 8 | 3 | 4 | 1088.2 | 1200 | 552 | 143 | 302 | 545 |
