| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Kajiyama, Ieyoshi | MR | Free Agent | 21 | 06/23/1994 | Ebetsu | JPN | Right | Left | 6' 6" | 220 lbs | - |
| Kakuta, Katsumi | MR | Free Agent | 34 | 11/04/1981 | Tokyo | JPN | Right | Right | 6' 0" | 198 lbs | - |
| Kakuta, Masaru | SP | Free Agent | 31 | 07/08/1984 | Gyoda | JPN | Right | Right | 5' 10" | 190 lbs | - |
| Kakuta, Shunsen | SP | Free Agent | 21 | 07/07/1994 | Obu | JPN | Right | Right | 6' 2" | 215 lbs | - |
| Kamida, Ienobu | 2B | Free Agent | 34 | 01/19/1981 | Fujimi | JPN | Right | Right | 6' 4" | 221 lbs | - |
| Kamida, Kiichi | CL | Chunichi Dragons | 21 | 05/18/1994 | Toyama | JPN | Right | Right | 5' 10" | 200 lbs | - |
| Kamida, Konosuke | 1B | Free Agent | 24 | 08/14/1991 | Kiyose | JPN | Right | Right | 6' 1" | 230 lbs | - |
| Kamida, Motoyuki | 1B | Hanshin Tigers | 31 | 06/17/1984 | Yokaichiba | JPN | Right | Right | 6' 0" | 215 lbs | - |
| Kamida, Shiro | 1B | Hiroshima Toyo Carp | 21 | 09/26/1994 | Yamato | JPN | Left | Left | 6' 2" | 175 lbs | - |
| Kamida, Shosuke | MR | Free Agent | 29 | 10/08/1986 | Toyohashi | JPN | Switch | Right | 5' 11" | 218 lbs | - |
| Kamida, Sozen | RF | Fukuoka SoftBank Hawks | 21 | 12/05/1994 | Yamagata | JPN | Right | Right | 6' 2" | 215 lbs | - |
| Kamihara, Atsumori | SP | Hokkaido Nippon-Ham Fighters | 26 | 11/30/1989 | Kashiba | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Kamihara, Kitahachi | MR | Free Agent | 33 | 06/01/1982 | Sapporo | JPN | Left | Left | 5' 9" | 192 lbs | - |
| Kamimura, Moromao | C | Free Agent | 34 | 08/10/1981 | Fukuyama | JPN | Right | Right | 5' 11" | 190 lbs | - |
| Kamimura, Shimpei | CF | Free Agent | 24 | 06/24/1991 | Hasaki | JPN | Left | Left | 6' 2" | 210 lbs | - |
| Kamimura, Toshikasu | MR | Hanshin Tigers | 27 | 07/13/1988 | Nagoya | JPN | Left | Left | 5' 10" | 190 lbs | - |
| Kamioka, Masakado | SS | Saitama Seibu Lions | 26 | 11/15/1989 | Kakogawa | JPN | Right | Right | 6' 1" | 180 lbs | - |
| Kamuta, Kensaku | MR | Hiroshima Toyo Carp | 35 | 02/06/1980 | Nagoya | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Kamuta, Shinichi | LF | Free Agent | 24 | 03/05/1991 | Osaka | JPN | Right | Right | 6' 3" | 230 lbs | - |
| Kan, Yasunari | 1B | Free Agent | 29 | 08/02/1986 | Okayama | JPN | Right | Right | 6' 2" | 206 lbs | - |
| Kan, Yoshitaka | C | Hiroshima Toyo Carp | 22 | 11/29/1993 | Kyoto | JPN | Left | Right | 6' 1" | 195 lbs | - |
| Kanamori, Kensaku | SP | Free Agent | 19 | 02/18/1996 | Izumi | JPN | Right | Right | 6' 1" | 225 lbs | - |
| Kanda, Hayato | SP | Fukuoka SoftBank Hawks | 29 | 02/08/1986 | Niitsu | JPN | Left | Right | 6' 0" | 190 lbs | - |
| Kanda, Toshimichi | 3B | Free Agent | 20 | 02/19/1995 | Sapporo | JPN | Right | Right | 5' 10" | 180 lbs | - |
| Kanda, Yasuyuki | 1B | Hokkaido Nippon-Ham Fighters | 28 | 07/17/1987 | Matsuyama | JPN | Right | Right | 6' 2" | 215 lbs | - |
| Kaneko, Kanzaburo | 1B | Tokyo Yakult Swallows | 24 | 06/06/1991 | Akita | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kaneko, Katsuhiko | RF | Hokkaido Nippon-Ham Fighters | 24 | 01/24/1991 | Sendai | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kaneko, Moromao | CF | Free Agent | 27 | 05/13/1988 | Shizuoka | JPN | Right | Right | 6' 2" | 185 lbs | - |
| Kaneko, Naosuke | LF | Free Agent | 21 | 06/14/1994 | Nagano | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Kaneko, Ryozo | 3B | Free Agent | 36 | 05/17/1979 | Kamisato | JPN | Right | Right | 5' 11" | 215 lbs | - |
| Kaneko, Takeo | LF | Free Agent | 31 | 12/04/1984 | Kammaki | JPN | Right | Right | 6' 2" | 217 lbs | - |
| Kanno, Kozue | RF | Free Agent | 28 | 08/09/1987 | Tokyo | JPN | Left | Left | 5' 10" | 197 lbs | - |
| Kanno, Yoshitaka | MR | Hokkaido Nippon-Ham Fighters | 21 | 01/26/1994 | Hitachinaka | JPN | Left | Left | 5' 9" | 195 lbs | - |
| Kataoka, Yoritoki | 3B | Free Agent | 30 | 03/09/1985 | Toyama | JPN | Right | Right | 6' 0" | 212 lbs | - |
| Katayama, Kohei | 3B | Hokkaido Nippon-Ham Fighters | 21 | 12/29/1994 | Fukuoka | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Katayama, Natsume | LF | Free Agent | 29 | 03/07/1986 | Jonan | JPN | Right | Right | 5' 10" | 205 lbs | - |
| Katayama, Teruo | CF | Free Agent | 23 | 01/03/1992 | Matsuyama | JPN | Left | Left | 6' 4" | 215 lbs | - |
| Kato, Akihisa | RF | Free Agent | 33 | 12/09/1982 | Kawasaki | JPN | Left | Left | 6' 0" | 204 lbs | - |
| Kato, Izumo | RF | Free Agent | 17 | 09/23/1998 | Ichinoseki | JPN | Right | Left | 6' 0" | 190 lbs | - |
| Kato, Kawanari | LF | Free Agent | 22 | 04/02/1993 | Akashi | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Kato, Kazuyuki | LF | Free Agent | 35 | 09/21/1980 | Ageo | JPN | Left | Left | 6' 0" | 210 lbs | - |
| Kato, Kiyohira | SP | Free Agent | 35 | 03/18/1980 | Tokyo | JPN | Left | Left | 5' 8" | 180 lbs | - |
| Kato, Shinsaku | 3B | Chiba Lotte Marines | 32 | 09/30/1983 | Fukuoka | JPN | Right | Right | 5' 11" | 170 lbs | - |
| Kato, Shintaro | CF | Free Agent | 26 | 06/19/1989 | Nagoya | JPN | Left | Left | 6' 0" | 175 lbs | - |
| Kato, Sotan | CL | Free Agent | 36 | 06/06/1979 | Toyokawa | JPN | Right | Right | 6' 6" | 210 lbs | - |
| Kato, Takeo | SP | Free Agent | 37 | 04/29/1978 | Kumano | JPN | Right | Right | 5' 11" | 210 lbs | - |
| Kato, Toshiharu | SS | Free Agent | 32 | 01/22/1983 | Hiratsuka | JPN | Right | Right | 6' 3" | 156 lbs | - |
| Kato, Toshikazu | RF | Fukuoka SoftBank Hawks | 35 | 03/18/1980 | Seki | JPN | Left | Left | 6' 5" | 215 lbs | - |
| Kato, Toshiki | 3B | Yomiuri Giants | 21 | 02/07/1994 | Mitaka | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Kato, Yodo | SP | ORIX Buffaloes | 36 | 09/02/1979 | Tsukuba | JPN | Right | Right | 6' 4" | 210 lbs | - |
| Kawaguchi, Kanbe | 3B | Free Agent | 32 | 01/16/1983 | Chiba | JPN | Right | Right | 6' 2" | 184 lbs | - |
| Kawaguchi, Kazuki | SS | Hanshin Tigers | 31 | 12/31/1984 | Yao | JPN | Right | Right | 6' 0" | 220 lbs | - |
| Kawaguchi, Shotaro | 1B | Tokyo Yakult Swallows | 25 | 11/24/1990 | Yokohama | JPN | Left | Right | 6' 2" | 230 lbs | - |
| Kawahara, Yoriyoshi | MR | Free Agent | 29 | 01/06/1986 | Kobe | JPN | Right | Right | 5' 11" | 200 lbs | - |
| Kawai, Arinori | MR | Free Agent | 28 | 07/11/1987 | Nagoya | JPN | Switch | Right | 6' 0" | 212 lbs | - |
| Kawai, Iwao | RF | Free Agent | 27 | 05/29/1988 | Asahikawa | JPN | Right | Left | 6' 0" | 180 lbs | - |
| Kawai, Masamune | 3B | Free Agent | 28 | 07/05/1987 | Hofu | JPN | Right | Right | 6' 1" | 188 lbs | - |
| Kawai, Takehide | CF | Free Agent | 31 | 06/18/1984 | Oiso | JPN | Right | Left | 6' 0" | 215 lbs | - |
| Kawakami, Kunimatsu | 1B | Free Agent | 26 | 09/03/1989 | Kanda | JPN | Switch | Right | 6' 0" | 225 lbs | - |
| Kawakami, Norogumi | MR | Free Agent | 30 | 01/08/1985 | Iwatsuki | JPN | Left | Left | 6' 1" | 202 lbs | - |
| Kawamura, Shunsho | MR | Free Agent | 18 | 11/20/1997 | Sendai | JPN | Right | Right | 6' 0" | 235 lbs | - |
| Kawano, Josuke | SS | Free Agent | 22 | 04/10/1993 | Fukuoka | JPN | Right | Right | 5' 11" | 195 lbs | - |
| Kawano, Minoru | LF | Free Agent | 37 | 12/24/1978 | Yamatotakada | JPN | Left | Right | 6' 0" | 192 lbs | - |
| Kawano, Narihari | LF | Free Agent | 27 | 10/29/1988 | Komatsu | JPN | Left | Right | 5' 11" | 197 lbs | - |
| Kawano, Shigekazu | MR | Fukuoka SoftBank Hawks | 20 | 08/17/1995 | Sakai | JPN | Left | Left | 6' 0" | 200 lbs | - |
| Kawano, Tomoyuki | LF | Free Agent | 31 | 04/27/1984 | Marugame | JPN | Left | Left | 6' 3" | 226 lbs | - |
| Kawasaki, Goro | SP | Free Agent | 28 | 12/20/1987 | Matsuyama | JPN | Left | Left | 6' 1" | 194 lbs | - |
| Kawasaki, Noritada | MR | Free Agent | 18 | 07/24/1997 | Sango | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Kawasaki, Shigematsu | SP | Free Agent | 26 | 11/20/1989 | Nagoya | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Kawasaki, Yoshitaka | 3B | Free Agent | 21 | 11/10/1994 | Kobe | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Kawashima, Masahiko | RF | Free Agent | 32 | 09/30/1983 | Yokosuka | JPN | Right | Right | 6' 1" | 179 lbs | - |
| Kawashima, Tetsu | C | Saitama Seibu Lions | 18 | 07/10/1997 | Kokubunji | JPN | Right | Right | 5' 10" | 195 lbs | - |
| Kawashima, Toyoharu | 2B | Free Agent | 19 | 04/03/1996 | Tokyo | JPN | Left | Right | 5' 9" | 190 lbs | - |
| Kawashima, Yukichi | MR | Free Agent | 19 | 01/12/1996 | Kashiwa | JPN | Right | Right | 6' 3" | 230 lbs | - |
| Kichida, Arinori | 1B | Yokohama Bay Stars | 28 | 02/02/1987 | Nagaizumi | JPN | Right | Right | 6' 6" | 213 lbs | - |
| Kichida, Kojiro | SP | Free Agent | 33 | 04/05/1982 | Sennan | JPN | Right | Right | 6' 2" | 208 lbs | - |
| Kichida, Masakado | C | Free Agent | 29 | 11/21/1986 | Kawaguchi | JPN | Right | Right | 6' 3" | 201 lbs | - |
| Kichida, Masaki | SP | Free Agent | 27 | 08/16/1988 | Okazaki | JPN | Left | Left | 5' 10" | 178 lbs | - |
| Kichida, Motoki | MR | Free Agent | 21 | 04/23/1994 | Fujiidera | JPN | Switch | Right | 6' 0" | 163 lbs | - |
| Kichida, Sadanobu | SP | Fukuoka SoftBank Hawks | 26 | 09/13/1989 | Tokyo | JPN | Right | Right | 5' 9" | 200 lbs | - |
| Kichida, Takahiro | RF | Free Agent | 28 | 01/23/1987 | Tokyo | JPN | Left | Left | 6' 1" | 215 lbs | - |
| Kichida, Takakazu | SP | Free Agent | 31 | 12/02/1984 | Yatsushiro | JPN | Right | Right | 6' 1" | 204 lbs | - |
| Kichida, Tomiji | MR | Free Agent | 17 | 11/22/1998 | Tottori | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kichida, Toshiharu | C | Free Agent | 29 | 03/29/1986 | Okayama | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kichida, Tsugumichi | SS | Chunichi Dragons | 36 | 07/01/1979 | Kannami | JPN | Right | Right | 5' 11" | 195 lbs | - |
| Kichida, Yasuoka | SP | Yokohama Bay Stars | 33 | 01/26/1982 | Toyota | JPN | Switch | Right | 5' 7" | 190 lbs | - |
| Kichida, Yoichi | LF | Free Agent | 28 | 02/15/1987 | Okazaki | JPN | Left | Left | 5' 9" | 194 lbs | - |
| Kikuchi, Shusaku | 2B | Free Agent | 22 | 02/04/1993 | Odawara | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Kikuchi, Shusui | 2B | ORIX Buffaloes | 19 | 03/17/1996 | Tokyo | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Kikuchi, Yoshitora | 2B | Free Agent | 34 | 12/25/1981 | Kurashiki | JPN | Right | Right | 6' 1" | 202 lbs | - |
| Kimura, Jun'ichi | SP | Hokkaido Nippon-Ham Fighters | 18 | 04/04/1997 | Heguri | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Kimura, Kichibei | LF | Free Agent | 34 | 06/11/1981 | Odawara | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Kimura, Sakutaro | RF | Fukuoka SoftBank Hawks | 32 | 11/28/1983 | Yachiyo | JPN | Right | Right | 6' 5" | 200 lbs | - |
| Kimura, Sozen | C | Free Agent | 20 | 04/22/1995 | Kobe | JPN | Right | Right | 5' 8" | 195 lbs | - |
| Kimura, Taizo | SS | Free Agent | 24 | 10/13/1991 | Kawasaki | JPN | Right | Right | 5' 10" | 180 lbs | - |
| Kimura, Tamuramaro | LF | Free Agent | 34 | 08/26/1981 | Kasukabe | JPN | Right | Right | 6' 4" | 216 lbs | - |
| Kimura, Toshinobu | 2B | Tokyo Yakult Swallows | 34 | 05/03/1981 | Osaka | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Kimura, Tsuyoshi | 3B | Free Agent | 34 | 06/06/1981 | Sendai | JPN | Right | Right | 6' 1" | 182 lbs | - |
| Kimura, Yasuhiro | SP | ORIX Buffaloes | 22 | 06/28/1993 | Matsuyama | JPN | Right | Left | 6' 4" | 210 lbs | - |
| Kimura, Yasuhiro | RF | Free Agent | 33 | 10/21/1982 | Kyoto | JPN | Left | Left | 6' 3" | 192 lbs | - |
| Kimura, Yoshinori | LF | Free Agent | 34 | 12/17/1981 | Meiwa | JPN | Right | Right | 5' 8" | 206 lbs | - |
| Kimura, Yujiro | CF | Yomiuri Giants | 34 | 07/09/1981 | Nagoya | JPN | Left | Left | 6' 0" | 200 lbs | - |
| Kino, Katsumi | MR | Free Agent | 34 | 03/18/1981 | Yokohama | JPN | Left | Left | 5' 10" | 197 lbs | - |
| Kino, Kazuma | 3B | Free Agent | 25 | 08/27/1990 | Yamato | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Kinugasa, Yoshinobu | 2B | ORIX Buffaloes | 18 | 10/01/1997 | Kashima | JPN | Right | Right | 5' 10" | 195 lbs | - |
| Kishita, Ieyoshi | SP | Free Agent | 23 | 07/23/1992 | Hamamatsu | JPN | Left | Right | 5' 11" | 205 lbs | - |
| Kishita, Subaru | SP | Hiroshima Toyo Carp | 24 | 08/03/1991 | Tokyo | JPN | Right | Right | 6' 3" | 205 lbs | - |
| Kitagawa, Sadakuno | 1B | Free Agent | 36 | 07/12/1979 | Nara | JPN | Right | Right | 6' 5" | 201 lbs | - |
| Kitamura, Iemitsu | 2B | Free Agent | 26 | 03/04/1989 | Sanda | JPN | Right | Right | 5' 10" | 187 lbs | - |
| Kitamura, Matsuyo | 2B | Free Agent | 29 | 02/05/1986 | Matsubara | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Kitamura, Takuya | LF | Free Agent | 24 | 01/28/1991 | Ushiku | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Kitamura, Tomiji | CF | Free Agent | 34 | 07/09/1981 | Kosei | JPN | Left | Left | 5' 9" | 177 lbs | - |
| Kitamura, Tsuginori | MR | Free Agent | 17 | 11/13/1998 | Kamakura | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Kito, Yoichibei | 3B | Free Agent | 19 | 04/04/1996 | Fujinomiya | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Kiyohara, Mamoru | RF | Free Agent | 34 | 10/03/1981 | Hadano | JPN | Left | Left | 6' 4" | 225 lbs | - |
| Kiyomizu, Akira | LF | ORIX Buffaloes | 35 | 02/14/1980 | Sakura | JPN | Right | Right | 6' 4" | 210 lbs | - |
| Kiyomizu, Hirotsugu | 1B | Free Agent | 27 | 09/02/1988 | Kozakai | JPN | Left | Left | 6' 0" | 225 lbs | - |
| Kiyomizu, Kazuhiro | LF | Free Agent | 32 | 11/22/1983 | Osaka | JPN | Right | Right | 6' 0" | 198 lbs | - |
| Kiyomizu, Kenzaburo | MR | Free Agent | 36 | 07/17/1979 | Hiratsuka | JPN | Switch | Left | 5' 8" | 184 lbs | - |
| Kiyomizu, Matsuyo | LF | Free Agent | 22 | 11/11/1993 | Kitami | JPN | Left | Left | 6' 2" | 160 lbs | - |
| Kiyomizu, Minoru | C | Hanshin Tigers | 36 | 02/25/1979 | Kawanoe | JPN | Switch | Right | 5' 11" | 180 lbs | - |
| Kiyomizu, Shinji | 2B | Chunichi Dragons | 34 | 09/12/1981 | Kuroishi | JPN | Right | Right | 5' 10" | 205 lbs | - |
| Kiyomizu, Shunen | LF | Yokohama Bay Stars | 24 | 01/08/1991 | Tokushima | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kiyomizu, Takechi | 2B | Yomiuri Giants | 25 | 09/18/1990 | Akiruno | JPN | Right | Right | 5' 11" | 195 lbs | - |
| Kiyomizu, Teika | CF | Free Agent | 22 | 07/29/1993 | Otsu | JPN | Left | Left | 6' 2" | 230 lbs | - |
| Kiyomizu, Toyokuni | SS | Free Agent | 24 | 01/10/1991 | Osaka | JPN | Left | Right | 6' 2" | 155 lbs | - |
| Kiyomizu, Yoshinaka | RF | Free Agent | 27 | 04/08/1988 | Osaka | JPN | Right | Right | 6' 2" | 216 lbs | - |
| Kobayashi, Eisuke | LF | Free Agent | 26 | 09/30/1989 | Nishio | JPN | Left | Right | 6' 3" | 202 lbs | - |
| Kobayashi, Jotaro | SP | Hiroshima Toyo Carp | 26 | 11/06/1989 | Okayama | JPN | Right | Right | 6' 7" | 210 lbs | - |
| Kobayashi, Jun | 1B | Free Agent | 22 | 01/09/1993 | Yao | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Kobayashi, Kei | RF | Free Agent | 25 | 02/06/1990 | Ebetsu | JPN | Right | Right | 5' 10" | 175 lbs | - |
| Kobayashi, Kiyoemon | SP | Fukuoka SoftBank Hawks | 26 | 05/08/1989 | Tokyo | JPN | Right | Left | 6' 1" | 185 lbs | - |
| Kobayashi, Koki | 1B | Free Agent | 20 | 02/11/1995 | Saijo | JPN | Right | Right | 6' 3" | 160 lbs | - |
| Kobayashi, Masami | 1B | Free Agent | 19 | 10/03/1996 | Tokyo | JPN | Switch | Right | 6' 2" | 235 lbs | - |
| Kobayashi, Matsuyo | MR | Free Agent | 17 | 10/27/1998 | Sayama | JPN | Left | Right | 5' 11" | 200 lbs | - |
| Kobayashi, Mushanokoji | C | Free Agent | 20 | 04/19/1995 | Tokyo | JPN | Right | Right | 6' 0" | 205 lbs | - |
| Kobayashi, Naohiro | 1B | Fukuoka SoftBank Hawks | 34 | 04/25/1981 | Kashiwa | JPN | Switch | Right | 5' 9" | 205 lbs | - |
| Kobayashi, Nobuhiko | SP | Yomiuri Giants | 23 | 04/27/1992 | Tokyo | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Kobayashi, Nobuhito | MR | Free Agent | 34 | 10/09/1981 | Showa | JPN | Left | Left | 5' 8" | 217 lbs | - |
| Kobayashi, Sotan | CL | Fukuoka SoftBank Hawks | 23 | 04/18/1992 | Soja | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Kobayashi, Sukenobu | 1B | Free Agent | 32 | 04/21/1983 | Hatsukaichi | JPN | Left | Right | 6' 4" | 211 lbs | - |
| Kobayashi, Tadaaki | CF | Free Agent | 20 | 01/04/1995 | Sagamihara | JPN | Right | Right | 6' 0" | 170 lbs | - |
| Kobayashi, Takejiro | 1B | Free Agent | 35 | 06/02/1980 | Kitakyushu | JPN | Left | Right | 6' 2" | 229 lbs | - |
| Kobayashi, Ton | 1B | Yokohama Bay Stars | 29 | 08/22/1986 | Izumo | JPN | Left | Right | 6' 1" | 158 lbs | - |
| Kobayashi, Toshikuni | LF | Tohoku Rakuten Golden Eagles | 35 | 04/17/1980 | Imabari | JPN | Switch | Right | 6' 1" | 185 lbs | - |
| Kobayashi, Tsurayaki | MR | Free Agent | 37 | 04/21/1978 | Tamana | JPN | Right | Right | 6' 7" | 211 lbs | - |
| Kobayashi, Tsurayuki | RF | Tokyo Yakult Swallows | 32 | 06/21/1983 | Yubari | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kobayashi, Yoichibei | SP | Tohoku Rakuten Golden Eagles | 22 | 03/18/1993 | Yokohama | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Koda, Shotaro | SP | Free Agent | 34 | 07/27/1981 | Fukuchiyama | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Koda, Shunsho | MR | Free Agent | 30 | 09/10/1985 | Tokyo | JPN | Right | Right | 6' 0" | 199 lbs | - |
| Koda, Sosuke | MR | Free Agent | 18 | 04/02/1997 | Sanyo | JPN | Right | Left | 6' 1" | 210 lbs | - |
| Koda, Tsunesaburo | MR | Yokohama Bay Stars | 34 | 05/13/1981 | Kitakyushu | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Koda, Yasujiro | SP | Saitama Seibu Lions | 19 | 08/28/1996 | Iwata | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Kodama, Ryutaro | 3B | Free Agent | 29 | 06/12/1986 | Isehara | JPN | Switch | Right | 5' 11" | 196 lbs | - |
| Kodama, Yoshihide | 2B | Yokohama Bay Stars | 19 | 04/26/1996 | Hanamaki | JPN | Right | Right | 5' 11" | 200 lbs | - |
| Kodama, Yoshihiro | 3B | Free Agent | 29 | 11/14/1986 | Kobe | JPN | Right | Right | 6' 0" | 187 lbs | - |
| Kodo, Toshitsugu | LF | Free Agent | 36 | 08/21/1979 | Naha | JPN | Switch | Right | 6' 0" | 204 lbs | - |
| Koga, Masahiko | LF | Free Agent | 20 | 01/28/1995 | Toyonaka | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Koga, Masutaro | SS | Free Agent | 32 | 02/07/1983 | Noda | JPN | Right | Right | 5' 8" | 177 lbs | - |
| Koga, Tsutomu | LF | Fukuoka SoftBank Hawks | 33 | 12/25/1982 | Mishima | JPN | Left | Left | 6' 5" | 195 lbs | - |
| Kogawa, Kenji | 1B | Free Agent | 21 | 09/11/1994 | Urayasu | JPN | Right | Right | 5' 11" | 205 lbs | - |
| Kogawa, Kosami | 1B | Chiba Lotte Marines | 21 | 09/23/1994 | Morioka | JPN | Right | Right | 6' 6" | 210 lbs | - |
| Kogawa, Tadasu | MR | Free Agent | 35 | 02/16/1980 | Miura | JPN | Left | Left | 5' 11" | 183 lbs | - |
| Kogawa, Tetsui | MR | Free Agent | 17 | 01/07/1998 | Sendai | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Kohara, Sojuro | 1B | Free Agent | 34 | 12/12/1981 | Oita | JPN | Left | Left | 6' 4" | 215 lbs | - |
| Kohno, Matsudaira | MR | Free Agent | 23 | 02/03/1992 | Narita | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Koike, Kunimatsu | MR | Hanshin Tigers | 31 | 09/08/1984 | Neyagawa | JPN | Left | Right | 6' 7" | 210 lbs | - |
| Koike, Nakazo | SP | Fukuoka SoftBank Hawks | 35 | 11/10/1980 | Osaka | JPN | Right | Left | 5' 10" | 200 lbs | - |
| Koike, Seinosuke | CF | Free Agent | 18 | 12/09/1997 | Ichinomiya | JPN | Right | Right | 5' 10" | 180 lbs | - |
| Koizumi, Hyobe | 1B | Hiroshima Toyo Carp | 20 | 12/31/1995 | Nagasaki | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Koizumi, Nobuatsu | MR | Free Agent | 31 | 03/11/1984 | Kurume | JPN | Left | Left | 6' 7" | 200 lbs | - |
| Koizumi, Toshiro | RF | Chiba Lotte Marines | 26 | 11/05/1989 | Nogi | JPN | Left | Left | 6' 1" | 195 lbs | - |
| Koizumi, Tsumemasa | MR | Free Agent | 30 | 03/13/1985 | Saku | JPN | Left | Right | 5' 10" | 197 lbs | - |
| Kojima, Koji | SP | Free Agent | 34 | 05/19/1981 | Tokyo | JPN | Switch | Right | 6' 3" | 209 lbs | - |
| Kokawa, Hirokichi | 1B | Hiroshima Toyo Carp | 18 | 10/19/1997 | Saitama | JPN | Left | Left | 6' 2" | 220 lbs | - |
| Kokawa, Kiichi | LF | Free Agent | 24 | 04/25/1991 | Hirosaki | JPN | Left | Left | 6' 1" | 195 lbs | - |
| Kokawa, Kosami | SP | Free Agent | 29 | 06/19/1986 | Neyagawa | JPN | Right | Right | 6' 1" | 208 lbs | - |
| Kokawa, Mitsuharu | C | Free Agent | 22 | 01/04/1993 | Koganei | JPN | Right | Left | 6' 3" | 205 lbs | - |
| Kokawa, Motoyuki | 1B | Fukuoka SoftBank Hawks | 30 | 02/01/1985 | Itsukaichi | JPN | Right | Right | 6' 3" | 190 lbs | - |
| Kokawa, Tekkan | C | Free Agent | 20 | 03/04/1995 | Higashiosaka | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Kokawa, Tsunayoshi | RF | Free Agent | 28 | 01/26/1987 | Amagasaki | JPN | Left | Left | 6' 2" | 199 lbs | - |
| Kokawa, Yasukazu | MR | Free Agent | 30 | 05/03/1985 | Kobe | JPN | Right | Right | 6' 1" | 184 lbs | - |
| Kokawa, Yukichi | 1B | Free Agent | 29 | 10/17/1986 | Ikoma | JPN | Left | Left | 6' 0" | 218 lbs | - |
| Komatsu, Kichisaburo | CF | Yokohama Bay Stars | 25 | 05/21/1990 | Nagoya | JPN | Left | Right | 6' 0" | 175 lbs | - |
| Komatsu, Sadahige | SP | Free Agent | 27 | 03/27/1988 | Wakayama | JPN | Switch | Right | 6' 8" | 207 lbs | - |
| Kondo, Hiroya | CF | Free Agent | 33 | 05/14/1982 | Tomigusuku | JPN | Left | Left | 6' 2" | 214 lbs | - |
| Kondo, Keitaro | 2B | Free Agent | 30 | 06/05/1985 | Ichikawa | JPN | Left | Right | 5' 9" | 182 lbs | - |
| Kondo, Norihisa | LF | Free Agent | 36 | 08/26/1979 | Tarui | JPN | Right | Right | 6' 3" | 197 lbs | - |
| Kondo, Ryoma | SP | Free Agent | 27 | 08/07/1988 | Kodaira | JPN | Right | Right | 5' 8" | 195 lbs | - |
| Kondo, Tamasaburo | 2B | Free Agent | 27 | 04/11/1988 | Imaichi | JPN | Right | Right | 6' 0" | 193 lbs | - |
| Kondo, Tokuma | SP | Tokyo Yakult Swallows | 28 | 08/19/1987 | Iwakuni | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Kondo, Toyokazu | MR | Free Agent | 32 | 10/07/1983 | Isesaki | JPN | Left | Left | 6' 7" | 204 lbs | - |
| Kondo, Yoriie | CF | Free Agent | 32 | 04/02/1983 | Taishi | JPN | Right | Right | 6' 0" | 187 lbs | - |
| Kondo, Yushiro | 1B | Free Agent | 34 | 01/12/1981 | Izumiotsu | JPN | Left | Left | 6' 0" | 201 lbs | - |
| Konishi, Sen | MR | Free Agent | 24 | 09/09/1991 | Nagaizumi | JPN | Right | Right | 6' 0" | 215 lbs | - |
| Kono, Ienobu | RF | Hanshin Tigers | 34 | 11/17/1981 | Hiroshima | JPN | Left | Left | 6' 5" | 197 lbs | - |
| Kono, Kazuhiko | LF | Fukuoka SoftBank Hawks | 25 | 12/01/1990 | Tokyo | JPN | Right | Right | 6' 3" | 150 lbs | - |
| Kono, Norio | 1B | Free Agent | 24 | 05/23/1991 | Tokyo | JPN | Right | Left | 6' 5" | 185 lbs | - |
| Kono, Sadao | 1B | Free Agent | 27 | 12/27/1988 | Hiroshima | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Kono, Teruo | RF | Free Agent | 31 | 11/22/1984 | Inzai | JPN | Left | Left | 6' 2" | 195 lbs | - |
| Kouda, Akihiro | MR | Tohoku Rakuten Golden Eagles | 22 | 02/18/1993 | Inagi | JPN | Left | Left | 5' 10" | 195 lbs | - |
| Kouda, Ichiyo | SS | Free Agent | 34 | 06/27/1981 | Musashino | JPN | Right | Right | 6' 1" | 212 lbs | - |
| Kouda, Noboru | 1B | Free Agent | 29 | 12/27/1986 | Hirosaki | JPN | Switch | Left | 6' 0" | 225 lbs | - |
| Kouda, Shigeru | SS | Fukuoka SoftBank Hawks | 23 | 03/22/1992 | Konan | JPN | Right | Right | 6' 0" | 220 lbs | - |
| Kouda, Takafumi | CF | Free Agent | 18 | 09/01/1997 | Tokyo | JPN | Right | Right | 5' 9" | 180 lbs | - |
| Kouki, Hiroya | MR | Free Agent | 22 | 09/18/1993 | Sapporo | JPN | Left | Left | 6' 5" | 225 lbs | - |
| Kouki, Taro | 2B | Free Agent | 36 | 01/12/1979 | Tawaramoto | JPN | Left | Right | 6' 0" | 208 lbs | - |
| Koumura, Akihiro | LF | Free Agent | 27 | 04/30/1988 | Iwaki | JPN | Right | Right | 6' 3" | 232 lbs | - |
| Koumura, Katsuyoshi | SS | Free Agent | 20 | 06/30/1995 | Kawasaki | JPN | Right | Right | 6' 2" | 160 lbs | - |
| Kouno, Matsuo | 3B | Free Agent | 37 | 03/31/1978 | Okayama | JPN | Right | Right | 6' 1" | 225 lbs | - |
| Kouno, Toshio | SP | Chiba Lotte Marines | 24 | 11/25/1991 | Niigata | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Kouno, Tsurayaki | MR | Free Agent | 23 | 10/04/1992 | Tamamura | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Kouno, Yoshitake | MR | Free Agent | 31 | 06/01/1984 | Nagoya | JPN | Switch | Right | 6' 4" | 227 lbs | - |
| Kouyama, Kiyotaka | LF | Hiroshima Toyo Carp | 33 | 11/16/1982 | Kawaguchi | JPN | Right | Right | 6' 4" | 227 lbs | - |
| Kouyama, Ryutaro | MR | Free Agent | 21 | 11/02/1994 | Hakodate | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Kouyama, Yo | 2B | Hanshin Tigers | 28 | 08/13/1987 | Funabashi | JPN | Right | Right | 6' 3" | 218 lbs | - |
| Koyama, Norio | C | Tokyo Yakult Swallows | 36 | 12/26/1979 | Matsuura | JPN | Right | Right | 6' 0" | 225 lbs | - |
| Koyama, Sadayoshi | MR | Free Agent | 28 | 02/14/1987 | Morioka | JPN | Left | Left | 6' 1" | 220 lbs | - |
| Kubo, Maresuke | C | Free Agent | 30 | 09/16/1985 | Ikoma | JPN | Right | Right | 6' 0" | 204 lbs | - |
| Kubo, Shirai | LF | Hiroshima Toyo Carp | 23 | 03/29/1992 | Matsusaka | JPN | Left | Left | 6' 1" | 215 lbs | - |
| Kubo, Yoshii | LF | Free Agent | 22 | 09/13/1993 | Tokyo | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Kubota, Satoshi | SS | Tohoku Rakuten Golden Eagles | 21 | 01/30/1994 | Toyoda | JPN | Right | Right | 6' 2" | 190 lbs | - |
| Kubota, Teinosuke | MR | Free Agent | 23 | 05/18/1992 | Himeji | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Kubota, Yosuke | MR | Free Agent | 25 | 03/01/1990 | Sapporo | JPN | Right | Right | 6' 1" | 186 lbs | - |
| Kudo, Akira | RF | Free Agent | 34 | 01/31/1981 | Yokohama | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Kudo, Katsunosuki | SS | Free Agent | 33 | 07/20/1982 | Hirakata | JPN | Right | Right | 5' 11" | 199 lbs | - |
| Kudo, Oda | SP | Chiba Lotte Marines | 20 | 04/02/1995 | Chiba | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Kudo, Tsuginori | RF | Hanshin Tigers | 30 | 05/23/1985 | Hyuga | JPN | Right | Right | 6' 6" | 215 lbs | - |
| Kuhabara, Narihari | C | Chiba Lotte Marines | 30 | 11/18/1985 | Shimoda | JPN | Switch | Right | 6' 0" | 185 lbs | - |
| Kuhabara, Shosuke | 2B | Free Agent | 30 | 11/17/1985 | Miki | JPN | Right | Right | 6' 0" | 211 lbs | - |
| Kuhabara, Tetsuo | MR | Tohoku Rakuten Golden Eagles | 32 | 11/21/1983 | Musashino | JPN | Right | Right | 5' 10" | 205 lbs | - |
| Kuhabara, Yoichibei | 2B | Free Agent | 29 | 11/24/1986 | Akita | JPN | Left | Right | 5' 10" | 203 lbs | - |
| Kumagai, Masayuki | LF | Free Agent | 33 | 02/13/1982 | Kasugai | JPN | Left | Right | 6' 4" | 230 lbs | - |
| Kumagai, Mokichi | 2B | Free Agent | 31 | 06/04/1984 | Aso | JPN | Right | Right | 6' 0" | 205 lbs | - |
| Kumagai, Shiki | SP | Free Agent | 34 | 07/14/1981 | Yokohama | JPN | Left | Left | 6' 4" | 225 lbs | - |
| Kumagai, Yodo | C | Chiba Lotte Marines | 34 | 03/22/1981 | Tokyo | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kurihara, Iemochi | SP | Free Agent | 27 | 04/23/1988 | Shibata | JPN | Right | Right | 6' 0" | 193 lbs | - |
| Kurihara, Okakura | RF | Free Agent | 23 | 11/05/1992 | Tama | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kurota, Hirotada | 2B | Yokohama Bay Stars | 31 | 07/09/1984 | Sapporo | JPN | Right | Right | 6' 1" | 180 lbs | - |
| Kurota, Kakuei | RF | Free Agent | 20 | 09/28/1995 | Kaminokawa | JPN | Switch | Right | 5' 11" | 185 lbs | - |
| Kurota, Tsuneari | SS | Tokyo Yakult Swallows | 19 | 07/12/1996 | Tsuruga | JPN | Right | Right | 5' 11" | 205 lbs | - |
| Kuwabara, Okura | RF | Chunichi Dragons | 22 | 11/14/1993 | Takahashi | JPN | Left | Left | 5' 11" | 195 lbs | - |
| Kuwabara, Shihei | 1B | ORIX Buffaloes | 22 | 07/20/1993 | Himi | JPN | Switch | Right | 6' 6" | 215 lbs | - |
| Kuwabara, Yoshinori | 3B | Free Agent | 35 | 02/08/1980 | Arao | JPN | Right | Right | 6' 0" | 211 lbs | - |