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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Kang, Jae-hoon | 1B | Fukuoka Hawks | 21 | 05/17/2023 | Puchon | KOR | Right | Right | 6' 2" | 230 lbs | - |
| Kato, Atsumori | SP | Chunichi Dragons | 20 | 08/23/2024 | Yokkaichi | JPN | Left | Left | 6' 0" | 180 lbs | - |
| Kato, Ieyoshi | SP | Saitama Lions | 32 | 08/07/2012 | Fujioka | JPN | Right | Right | 6' 0" | 195 lbs | $2,920,000 |
| Kato, Isao | SP | Yomiuri Giants | 25 | 02/06/2019 | Nirasaki | JPN | Left | Left | 6' 2" | 200 lbs | $100,000 |
| Kawaguchi, Haranobu | 2B | Orix Buffaloes | 27 | 06/16/2017 | Yatsushiro | JPN | Right | Right | 5' 10" | 185 lbs | - |
| Kawano, Sadanobu | SS | Chiba Marines | 20 | 04/02/2024 | Yokosuka | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Kawano, Shotaro | 2B | Chiba Marines | 21 | 11/24/2022 | Omagari | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Kichida, Hiroya | MR | Hanshin Tigers | 34 | 10/28/2010 | Sakai | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Kichida, Juichi | MR | Yomiuri Giants | 30 | 01/12/2014 | Sakata | JPN | Switch | Right | 6' 6" | 235 lbs | $360,000 |
| Kichida, Sen | CL | Fukuoka Hawks | 23 | 07/28/2021 | Okayama | JPN | Right | Right | 6' 4" | 210 lbs | $100,000 |
| Kichida, Tetsunori | C | Orix Buffaloes | 24 | 12/23/2019 | Fujisawa | JPN | Right | Right | 6' 0" | 225 lbs | - |
| Kichikawa, Ikki | C | Saitama Lions | 19 | 12/21/2024 | Abiko | JPN | Right | Right | 6' 4" | 205 lbs | - |
| Kikutake, Matsu | 2B | Saitama Lions | 25 | 11/20/2018 | Imaichi | JPN | Right | Right | 5' 10" | 190 lbs | $100,000 |
| Kim, Jin-hyun | SS | Saitama Lions | 19 | 09/07/2025 | Andong | KOR | Right | Right | 6' 2" | 185 lbs | - |
| Kim, Suk-hoon | SP | Free Agent | 21 | 09/25/2023 | Seoul | KOR | Right | Left | 6' 2" | 200 lbs | - |
| Kimata, Akio | SS | Saitama Lions | 26 | 03/16/2018 | Hirakata | JPN | Right | Right | 6' 1" | 190 lbs | $100,000 |
| Kimura, Kiyonobu | MR | Chunichi Dragons | 24 | 11/25/2019 | Hachioji | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kishikawa, Yugoro | SP | Fukuoka Hawks | 28 | 10/20/2016 | Osaka | JPN | Switch | Right | 6' 3" | 215 lbs | - |
| Kishita, Tadao | RF | Yomiuri Giants | 25 | 03/28/2019 | Utsunomiya | JPN | Right | Right | 6' 2" | 220 lbs | $100,000 |
| Kiyomizu, Kantaro | RF | Hanshin Tigers | 24 | 02/08/2020 | Shimodate | JPN | Right | Right | 6' 0" | 190 lbs | $100,000 |
| Kiyomizu, Masanori | MR | Saitama Lions | 26 | 08/14/2018 | Asahikawa | JPN | Right | Right | 6' 7" | 235 lbs | $100,000 |
| Kiyomizu, Takahiro | 1B | Yomiuri Giants | 23 | 06/29/2021 | Fukuoka | JPN | Right | Right | 6' 0" | 195 lbs | $100,000 |
| Kiyomizu, Toshiro | CF | Chunichi Dragons | 21 | 12/29/2022 | Saitama | JPN | Right | Right | 6' 4" | 205 lbs | - |
| Kneeshaw, Daryl | RF | Free Agent | 38 | 03/28/2006 | London | ENG | Switch | Right | 6' 2" | 190 lbs | - |
| Kobayashi, Hitomaro | SS | Chunichi Dragons | 21 | 04/14/2023 | Mitaka | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Kobayashi, Nobuyoshi | LF | Orix Buffaloes | 21 | 09/28/2023 | Toyo | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Koda, Yasushi | SS | Yomiuri Giants | 21 | 06/21/2023 | Funabashi | JPN | Left | Right | 6' 0" | 170 lbs | - |
| Koga, Munenori | 1B | Fukuoka Hawks | 29 | 04/22/2015 | Tsu | JPN | Switch | Right | 6' 3" | 260 lbs | - |
| Kojima, Naohiro | C | Chiba Marines | 21 | 08/08/2023 | Tamamura | JPN | Right | Right | 6' 0" | 200 lbs | $100,000 |
| Kokawa, Kinji | MR | Yomiuri Giants | 27 | 05/17/2017 | Oita | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Kokura, Iemitsu | CF | Orix Buffaloes | 25 | 07/26/2019 | Chiyoda | JPN | Right | Right | 5' 11" | 190 lbs | $100,000 |
| Kondo, Sadaharu | MR | Saitama Lions | 34 | 01/30/2010 | Hiji | JPN | Right | Right | 5' 8" | 235 lbs | $100,000 |
| Kondo, Toshiki | SS | Yokohama BayStars | 20 | 06/18/2024 | Kitakyushu | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Kondo, Yoshitoki | CL | Saitama Lions | 22 | 04/20/2022 | Nagoya | JPN | Switch | Right | 5' 11" | 190 lbs | - |
| Kono, Motoki | SP | Chunichi Dragons | 22 | 05/16/2022 | Ishinomaki | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Kouda, Mitsuoki | 2B | Orix Buffaloes | 34 | 07/15/2010 | Matsue | JPN | Right | Right | 6' 5" | 210 lbs | $160,000 |
| Koumura, Hidekazu | 2B | Yokohama BayStars | 25 | 08/14/2019 | Sano | JPN | Right | Right | 5' 10" | 200 lbs | - |
| Kouno, Makoto | SS | Yomiuri Giants | 25 | 02/16/2019 | Maki | JPN | Right | Right | 6' 2" | 205 lbs | $100,000 |
| Kozawa, Sotatsu | SS | Free Agent | 39 | 09/20/2005 | Shizuoka | JPN | Switch | Right | 6' 0" | 230 lbs | - |
| Kuehne, Alexander | MR | Yokohama BayStars | 32 | 08/15/2012 | Auerbach | GER | Right | Right | 6' 1" | 225 lbs | $150,000 |
| Kuga, Orinosuke | RF | Fukuoka Hawks | 35 | 09/25/2009 | Sobue | JPN | Right | Right | 6' 0" | 250 lbs | $100,000 |
| Kumagai, Jiro | 1B | Yokohama BayStars | 22 | 07/14/2022 | Kobe | JPN | Left | Left | 5' 11" | 210 lbs | - |
| Kurihara, Kanzaburo | 1B | Chiba Marines | 22 | 02/25/2022 | Hiratsuka | JPN | Left | Left | 6' 2" | 225 lbs | - |
| Kurihara, Yoshifumi | SP | Chiba Marines | 19 | 03/30/2025 | Ikoma | JPN | Left | Left | 6' 0" | 180 lbs | $100,000 |
