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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 |
|---|---|---|---|---|---|---|---|---|---|
| Forrest Kaiser | 2011-2013 | .241 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Yodo Kamida | 2024-2027 | .268 | 39 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Kaoru Kanagaki | 2020-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 5.63 | 11 |
| Hisashi Kanno | 2014-2015 | .100 | 0 | 0 | 11 | 7 | 5 | 5.00 | 124 |
| Kisho Kanno | 2020-2021 | .000 | 0 | 0 | 0 | 2 | 0 | 6.20 | 60 |
| Gabe Kapler | 1998-2003 | .272 | 51 | 223 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Karp | 2005-2021 | .107 | 1 | 12 | 77 | 64 | 16 | 4.30 | 741 |
| Matt Kata | 2005-2012 | .288 | 18 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Takechi Kataoka | 2017-2026 | .084 | 1 | 5 | 43 | 55 | 10 | 5.36 | 454 |
| Motoshige Kato | 2023-2030 | .155 | 0 | 29 | 68 | 58 | 0 | 4.43 | 876 |
| Yoshitake Kato | 2028-2033 | .280 | 13 | 208 | 0 | 0 | 0 | 0.00 | 0 |
| Tadataka Kawakami | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 3.60 | 4 |
| Tsunesaburo Kawamura | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kyoichi Kawasaki | 2026-2033 | .147 | 0 | 1 | 11 | 31 | 2 | 6.38 | 259 |
| Masaki Kawasaki | 2012-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 16.88 | 1 |
| Scott Kazmir | 2007-2013 | .250 | 0 | 1 | 9 | 13 | 3 | 6.73 | 145 |
| Austin Kearns | 2002-2017 | .282 | 548 | 1739 | 0 | 0 | 0 | 0.00 | 0 |
| Neal Keels | 2023-2033 | .255 | 137 | 585 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Kegler | 2007-2018 | .096 | 0 | 1 | 53 | 37 | 26 | 4.27 | 757 |
| Dexter Kelly | 2032-2033 | .267 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Kent Kelly | 2016-2025 | .218 | 23 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Kelton | 2004-2020 | .270 | 311 | 1066 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Kendall | 1996-2006 | .295 | 60 | 439 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Kent | 2018-2031 | .279 | 197 | 752 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Kent | 1992-2006 | .290 | 325 | 1276 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie Kern | 2031-2033 | .167 | 0 | 2 | 19 | 19 | 43 | 4.43 | 229 |
| Sang-cheol Ki | 2032-2033 | .053 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mazigh Kianjahe | 2024-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 0 |
| Ryan Kibler | 2008-2015 | .126 | 1 | 18 | 48 | 53 | 30 | 4.13 | 484 |
| Koichi Kichida | 2029-2029 | .286 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Koryusai Kichida | 2033-2033 | .043 | 0 | 0 | 7 | 5 | 0 | 5.52 | 62 |
| Byung-Hyun Kim | 2005-2009 | .174 | 0 | 16 | 55 | 30 | 1 | 3.66 | 729 |
| Byung-hyun Kim | 1999-2016 | .185 | 2 | 59 | 168 | 122 | 84 | 3.70 | 2384 |
| Song-saeng Kim | 2029-2033 | .083 | 0 | 0 | 9 | 8 | 2 | 4.40 | 235 |
| Sun-woo Kim | 2001-2011 | .190 | 0 | 2 | 8 | 7 | 0 | 5.00 | 140 |
| Mack King | 2031-2033 | .087 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ralph King | 2017-2018 | .095 | 0 | 0 | 6 | 9 | 0 | 4.63 | 128 |
| Ray King | 1999-2008 | .053 | 0 | 2 | 36 | 25 | 20 | 3.29 | 328 |
| Mike Kinkade | 1998-2007 | .296 | 30 | 178 | 0 | 0 | 0 | 0.00 | 0 |
| Kazuma Kino | 2021-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 4.40 | 10 |
| Robert Kirby | 2018-2018 | .238 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Donald Kirk | 2016-2028 | .269 | 13 | 109 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Kirkman | 2009-2023 | .132 | 0 | 0 | 21 | 22 | 8 | 6.14 | 224 |
| Hiroharu Kishita | 2021-2029 | .290 | 120 | 509 | 0 | 0 | 0 | 0.00 | 0 |
| Yasujiro Kishita | 2027-2028 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Kotaro Kiyomizu | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 2.00 | 8 |
| Brendan Klein | 2032-2033 | .250 | 0 | 0 | 8 | 8 | 19 | 3.86 | 76 |
| Steven Klein | 2011-2020 | .099 | 0 | 3 | 36 | 33 | 11 | 4.75 | 446 |
| Ryan Klesko | 1992-2009 | .284 | 375 | 1248 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Kline | 2022-2026 | .284 | 1 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Kline | 1997-2006 | .143 | 0 | 2 | 39 | 40 | 51 | 3.60 | 584 |
| Stephen Knight | 2024-2033 | .270 | 70 | 349 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Knoedler | 2006-2015 | .264 | 63 | 411 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Knott | 2003-2016 | .248 | 101 | 450 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Kobayashi | 2029-2033 | .245 | 49 | 192 | 0 | 0 | 0 | 0.00 | 0 |
| Ryuzaburo Kobayashi | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Moritz Koens | 2022-2022 | .000 | 0 | 0 | 5 | 3 | 1 | 5.03 | 39 |
| Isamu Kogawa | 2021-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 3 |
| Okura Kondo | 2024-2029 | .167 | 0 | 0 | 8 | 8 | 6 | 6.59 | 147 |
| Wei-qian Kong | 2017-2020 | .245 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Kunimatsu Konishi | 2016-2016 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kiyohisa Kono | 2022-2027 | .203 | 0 | 7 | 20 | 42 | 6 | 5.55 | 338 |
| Mike Koplove | 2001-2010 | .179 | 1 | 4 | 32 | 27 | 22 | 4.26 | 429 |
| John Koronka | 2006-2011 | .046 | 0 | 7 | 62 | 52 | 1 | 4.18 | 696 |
| Ijsbert Kost | 2022-2033 | .304 | 80 | 562 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Kotsay | 1997-2007 | .285 | 109 | 527 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Kraan | 2022-2027 | .289 | 13 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Krawiec | 2005-2006 | .152 | 0 | 4 | 4 | 13 | 0 | 5.99 | 64 |
| Josh Kroeger | 2010-2016 | .311 | 56 | 241 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Krynzel | 2006-2019 | .286 | 143 | 683 | 0 | 0 | 0 | 0.00 | 0 |
| Kiyomori Kudo | 2012-2012 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mashashi Kudo | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Kuhn | 2026-2033 | .429 | 0 | 1 | 19 | 17 | 58 | 4.41 | 345 |
| Lodewijk Kulk | 2019-2026 | .188 | 0 | 1 | 19 | 14 | 19 | 5.22 | 230 |
| Toshimichi Kumatani | 2033-2033 | .000 | 0 | 0 | 0 | 0 | 0 | 94.50 | 1 |
| Hong-Chi Kuo | 2012-2014 | .077 | 0 | 0 | 7 | 9 | 1 | 4.23 | 128 |
| Kuniyuki Kurota | 2020-2023 | .133 | 0 | 1 | 4 | 2 | 0 | 4.70 | 46 |
