| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Kajiyama, Ieyoshi | MR | Free Agent | 22 | 06/23/1994 | Ebetsu | JPN | Right | Left | 6' 6" | 220 lbs | - |
| Kakuta, Katsumi | MR | Free Agent | 35 | 11/04/1981 | Tokyo | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kakuta, Kiyomitsu | SP | Saitama Seibu Lions | 28 | 01/02/1988 | Ueda | JPN | Left | Left | 6' 0" | 208 lbs | - |
| Kakuta, Masaru | SP | Free Agent | 32 | 07/08/1984 | Gyoda | JPN | Right | Right | 5' 10" | 192 lbs | - |
| Kakuta, Shunsen | SP | Free Agent | 22 | 07/07/1994 | Obu | JPN | Right | Right | 6' 2" | 215 lbs | - |
| Kakuta, Sugita | C | Tokyo Yakult Swallows | 19 | 08/20/1997 | Isesaki | JPN | Right | Right | 6' 5" | 205 lbs | - |
| Kakuta, Yoshiyuki | MR | Free Agent | 21 | 09/03/1995 | Nagoya | JPN | Left | Right | 6' 7" | 210 lbs | - |
| Kamida, Ienobu | 2B | Free Agent | 35 | 01/19/1981 | Fujimi | JPN | Right | Right | 6' 4" | 221 lbs | - |
| Kamida, Kiichi | CL | Free Agent | 22 | 05/18/1994 | Toyama | JPN | Right | Right | 5' 10" | 200 lbs | - |
| Kamida, Konosuke | 1B | Free Agent | 25 | 08/14/1991 | Kiyose | JPN | Right | Right | 6' 1" | 230 lbs | - |
| Kamida, Oda | CF | Hokkaido Nippon-Ham Fighters | 23 | 07/05/1993 | Sagamihara | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Kamida, Shosuke | MR | Free Agent | 30 | 10/08/1986 | Toyohashi | JPN | Switch | Right | 5' 11" | 222 lbs | - |
| Kamida, Sozen | RF | Free Agent | 22 | 12/05/1994 | Yamagata | JPN | Right | Right | 6' 2" | 215 lbs | - |
| Kamihara, Atsumori | CL | Free Agent | 27 | 11/30/1989 | Kashiba | JPN | Right | Right | 6' 0" | 184 lbs | - |
| Kamimura, Shimpei | CF | Free Agent | 25 | 06/24/1991 | Hasaki | JPN | Left | Left | 6' 2" | 208 lbs | - |
| Kamimura, Toshikasu | MR | Free Agent | 28 | 07/13/1988 | Nagoya | JPN | Left | Left | 5' 10" | 196 lbs | - |
| Kamuta, Kensaku | MR | Free Agent | 36 | 02/06/1980 | Nagoya | JPN | Right | Right | 6' 3" | 201 lbs | - |
| Kan, Junnosuke | MR | Saitama Seibu Lions | 24 | 07/29/1992 | Saitama | JPN | Left | Right | 6' 0" | 180 lbs | - |
| Kan, Tsuginori | 3B | Free Agent | 17 | 06/23/1999 | Osaka | JPN | Switch | Right | 6' 0" | 215 lbs | - |
| Kan, Yasunari | 1B | Free Agent | 30 | 08/02/1986 | Okayama | JPN | Right | Right | 6' 2" | 206 lbs | - |
| Kan, Yoshitaka | C | Free Agent | 23 | 11/29/1993 | Kyoto | JPN | Left | Right | 6' 1" | 195 lbs | - |
| Kanamori, Kensaku | SP | Free Agent | 20 | 02/18/1996 | Izumi | JPN | Right | Right | 6' 1" | 235 lbs | - |
| Kanda, Hayato | CL | Free Agent | 30 | 02/08/1986 | Niitsu | JPN | Left | Right | 6' 0" | 192 lbs | - |
| Kanda, Tokutomi | SS | ORIX Buffaloes | 24 | 05/08/1992 | Tokyo | JPN | Right | Right | 6' 1" | 215 lbs | - |
| Kanda, Yasuyuki | 1B | Free Agent | 29 | 07/17/1987 | Matsuyama | JPN | Right | Right | 6' 2" | 213 lbs | - |
| Kaneko, Kanzaburo | 1B | Free Agent | 25 | 06/06/1991 | Akita | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kaneko, Katsuhiko | RF | Free Agent | 25 | 01/24/1991 | Sendai | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kaneko, Naosuke | LF | Free Agent | 22 | 06/14/1994 | Nagano | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Kaneko, Sadahige | MR | Tokyo Yakult Swallows | 25 | 03/21/1991 | Kure | JPN | Left | Left | 6' 3" | 195 lbs | - |
| Kaneko, Takeo | LF | Free Agent | 32 | 12/04/1984 | Kammaki | JPN | Right | Right | 6' 2" | 213 lbs | - |
| Kanno, Motoki | RF | Yomiuri Giants | 18 | 07/17/1998 | Kawachinagano | JPN | Right | Left | 6' 0" | 215 lbs | - |
| Kanno, Teruo | SP | Saitama Seibu Lions | 30 | 01/27/1986 | Tokyo | JPN | Switch | Right | 6' 0" | 215 lbs | - |
| Kanno, Yoshitaka | MR | Free Agent | 22 | 01/26/1994 | Hitachinaka | JPN | Left | Left | 5' 9" | 195 lbs | - |
| Kataoka, Tokutomi | SS | Hanshin Tigers | 34 | 04/04/1982 | Sendai | JPN | Switch | Right | 6' 0" | 215 lbs | - |
| Katayama, Kohei | 3B | Free Agent | 22 | 12/29/1994 | Fukuoka | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Katayama, Naoki | SP | Tohoku Rakuten Golden Eagles | 33 | 02/09/1983 | Tokyo | JPN | Left | Left | 6' 2" | 222 lbs | - |
| Katayama, Natsume | LF | Free Agent | 30 | 03/07/1986 | Jonan | JPN | Right | Right | 5' 10" | 207 lbs | - |
| Kato, Akihisa | RF | Free Agent | 34 | 12/09/1982 | Kawasaki | JPN | Left | Left | 6' 0" | 200 lbs | - |
| Kato, Horiuchi | C | Yokohama Bay Stars | 33 | 12/24/1983 | Kashiwa | JPN | Left | Right | 6' 0" | 192 lbs | - |
| Kato, Koto | MR | Hanshin Tigers | 21 | 09/22/1995 | Kobe | JPN | Right | Right | 6' 0" | 205 lbs | - |
| Kato, Ryunosuke | LF | Yokohama Bay Stars | 27 | 02/23/1989 | Higashine | JPN | Right | Right | 6' 5" | 190 lbs | - |
| Kato, Tamotsu | RF | Hokkaido Nippon-Ham Fighters | 18 | 10/28/1998 | Kurashiki | JPN | Left | Left | 6' 5" | 215 lbs | - |
| Kato, Toshikazu | RF | Free Agent | 36 | 03/18/1980 | Seki | JPN | Left | Left | 6' 5" | 217 lbs | - |
| Kato, Toshiki | 3B | Free Agent | 22 | 02/07/1994 | Mitaka | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Kato, Toyotomi | 1B | Chunichi Dragons | 30 | 08/07/1986 | Morioka | JPN | Right | Right | 5' 11" | 240 lbs | - |
| Kato, Yodo | SP | Free Agent | 37 | 09/02/1979 | Tsukuba | JPN | Right | Right | 6' 4" | 214 lbs | - |
| Kawaguchi, Kanbe | 3B | Free Agent | 33 | 01/16/1983 | Chiba | JPN | Right | Right | 6' 2" | 178 lbs | - |
| Kawaguchi, Kazuki | 1B | Free Agent | 32 | 12/31/1984 | Yao | JPN | Right | Right | 6' 0" | 218 lbs | - |
| Kawahara, Tashiro | MR | Free Agent | 17 | 03/15/1999 | Kurihashi | JPN | Right | Right | 6' 3" | 210 lbs | - |
| Kawahara, Yoriyoshi | MR | Free Agent | 30 | 01/06/1986 | Kobe | JPN | Right | Right | 5' 11" | 202 lbs | - |
| Kawai, Iwao | RF | Free Agent | 28 | 05/29/1988 | Asahikawa | JPN | Right | Left | 6' 0" | 180 lbs | - |
| Kawai, Takehide | CF | Free Agent | 32 | 06/18/1984 | Oiso | JPN | Right | Left | 6' 0" | 215 lbs | - |
| Kawakami, Kunimatsu | 1B | Free Agent | 27 | 09/03/1989 | Kanda | JPN | Switch | Right | 6' 0" | 223 lbs | - |
| Kawakami, Norogumi | MR | Free Agent | 31 | 01/08/1985 | Iwatsuki | JPN | Left | Left | 6' 1" | 202 lbs | - |
| Kawakami, Yoriyuki | CL | Yokohama Bay Stars | 22 | 01/04/1994 | Tokyo | JPN | Right | Right | 6' 0" | 205 lbs | - |
| Kawamura, Shunsho | MR | Free Agent | 19 | 11/20/1997 | Sendai | JPN | Right | Right | 6' 0" | 240 lbs | - |
| Kawano, Josuke | SS | Free Agent | 23 | 04/10/1993 | Fukuoka | JPN | Right | Right | 5' 11" | 195 lbs | - |
| Kawano, Narihari | LF | Free Agent | 28 | 10/29/1988 | Komatsu | JPN | Left | Right | 5' 11" | 193 lbs | - |
| Kawano, Shigekazu | MR | Free Agent | 21 | 08/17/1995 | Sakai | JPN | Left | Left | 6' 0" | 200 lbs | - |
| Kawano, Yorikane | RF | Fukuoka SoftBank Hawks | 24 | 08/30/1992 | Saitama | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Kawasaki, Noritada | MR | Free Agent | 19 | 07/24/1997 | Sango | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Kawasaki, Shigematsu | SP | Free Agent | 27 | 11/20/1989 | Nagoya | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Kawashima, Tetsu | C | Free Agent | 19 | 07/10/1997 | Kokubunji | JPN | Right | Right | 5' 10" | 195 lbs | - |
| Kawashima, Toyoharu | 2B | Free Agent | 20 | 04/03/1996 | Tokyo | JPN | Left | Right | 5' 9" | 190 lbs | - |
| Kawashima, Tsuramatsu | LF | Hanshin Tigers | 28 | 01/17/1988 | Saijo | JPN | Left | Left | 6' 0" | 193 lbs | - |
| Kawashima, Yukichi | MR | Free Agent | 20 | 01/12/1996 | Kashiwa | JPN | Right | Right | 6' 3" | 250 lbs | - |
| Kichida, Arinori | 1B | Free Agent | 29 | 02/02/1987 | Nagaizumi | JPN | Right | Right | 6' 6" | 209 lbs | - |
| Kichida, Atsushi | MR | Chunichi Dragons | 26 | 03/25/1990 | Nagoya | JPN | Right | Right | 6' 3" | 190 lbs | - |
| Kichida, Hiroshi | CF | Chiba Lotte Marines | 32 | 12/03/1984 | Ashiya | JPN | Right | Right | 6' 0" | 188 lbs | - |
| Kichida, Katsunan | C | Tohoku Rakuten Golden Eagles | 21 | 05/02/1995 | Ebino | JPN | Right | Right | 6' 5" | 230 lbs | - |
| Kichida, Kojiro | SP | Free Agent | 34 | 04/05/1982 | Sennan | JPN | Right | Right | 6' 2" | 208 lbs | - |
| Kichida, Mabuchi | SP | Hiroshima Toyo Carp | 34 | 07/13/1982 | Yawata | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Kichida, Masakado | C | Free Agent | 30 | 11/21/1986 | Kawaguchi | JPN | Right | Right | 6' 3" | 201 lbs | - |
| Kichida, Masaki | SP | Free Agent | 28 | 08/16/1988 | Okazaki | JPN | Left | Left | 5' 10" | 178 lbs | - |
| Kichida, Motoki | MR | Free Agent | 22 | 04/23/1994 | Fujiidera | JPN | Switch | Right | 6' 0" | 163 lbs | - |
| Kichida, Motonobu | MR | Fukuoka SoftBank Hawks | 36 | 09/18/1980 | Kamakura | JPN | Left | Left | 5' 9" | 200 lbs | - |
| Kichida, Sadanobu | SP | Free Agent | 27 | 09/13/1989 | Tokyo | JPN | Right | Right | 5' 9" | 200 lbs | - |
| Kichida, Takakazu | SP | Free Agent | 32 | 12/02/1984 | Yatsushiro | JPN | Right | Right | 6' 1" | 202 lbs | - |
| Kichida, Tsugumichi | 2B | Free Agent | 37 | 07/01/1979 | Kannami | JPN | Right | Right | 5' 11" | 195 lbs | - |
| Kichida, Yasuoka | SP | Free Agent | 34 | 01/26/1982 | Toyota | JPN | Switch | Right | 5' 7" | 192 lbs | - |
| Kichida, Yoshifusa | CF | ORIX Buffaloes | 29 | 11/26/1987 | Koga | JPN | Right | Right | 6' 3" | 160 lbs | - |
| Kichida, Yoshikazu | SP | ORIX Buffaloes | 26 | 02/20/1990 | Soka | JPN | Left | Left | 6' 5" | 220 lbs | - |
| Kichikawa, Yoriie | SP | Hiroshima Toyo Carp | 24 | 02/06/1992 | Eniwa | JPN | Switch | Right | 6' 3" | 193 lbs | - |
| Kikuchi, Masaharu | MR | Free Agent | 17 | 02/26/1999 | Ota | JPN | Right | Right | 6' 4" | 205 lbs | - |
| Kikuchi, Shusaku | 2B | Free Agent | 23 | 02/04/1993 | Odawara | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Kikuchi, Yoshitora | 2B | Free Agent | 35 | 12/25/1981 | Kurashiki | JPN | Right | Right | 6' 1" | 202 lbs | - |
| Kikui, Shigemasa | MR | Free Agent | 24 | 12/02/1992 | Maebashi | JPN | Right | Right | 6' 1" | 220 lbs | - |
| Kimura, Kichibei | LF | Free Agent | 35 | 06/11/1981 | Odawara | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Kimura, Kijuro | RF | ORIX Buffaloes | 25 | 08/08/1991 | Higashiosaka | JPN | Left | Left | 6' 3" | 200 lbs | - |
| Kimura, Kiyomitsu | MR | Hiroshima Toyo Carp | 30 | 06/14/1986 | Tokyo | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Kimura, Ryutaro | RF | Hanshin Tigers | 28 | 11/04/1988 | Yokohama | JPN | Left | Right | 6' 2" | 213 lbs | - |
| Kimura, Sakutaro | 1B | Free Agent | 33 | 11/28/1983 | Yachiyo | JPN | Right | Right | 6' 5" | 194 lbs | - |
| Kimura, Tabito | CF | Free Agent | 35 | 08/23/1981 | Fuji | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Kimura, Tamuramaro | LF | Free Agent | 35 | 08/26/1981 | Kasukabe | JPN | Right | Right | 6' 4" | 220 lbs | - |
| Kimura, Toshinobu | 3B | Free Agent | 35 | 05/03/1981 | Osaka | JPN | Right | Right | 6' 3" | 229 lbs | - |
| Kimura, Toshitsugu | 3B | ORIX Buffaloes | 36 | 04/11/1980 | Toin | JPN | Right | Right | 5' 11" | 195 lbs | - |
| Kimura, Yasuhiro | SP | Free Agent | 23 | 06/28/1993 | Matsuyama | JPN | Right | Left | 6' 4" | 210 lbs | - |
| Kimura, Yasuhiro | RF | Free Agent | 34 | 10/21/1982 | Kyoto | JPN | Left | Left | 6' 3" | 192 lbs | - |
| Kimura, Yoshinori | LF | Free Agent | 35 | 12/17/1981 | Meiwa | JPN | Right | Right | 5' 8" | 206 lbs | - |
| Kimura, Yujiro | RF | Free Agent | 35 | 07/09/1981 | Nagoya | JPN | Left | Left | 6' 0" | 194 lbs | - |
| Kino, Katsumi | MR | Free Agent | 35 | 03/18/1981 | Yokohama | JPN | Left | Left | 5' 10" | 197 lbs | - |
| Kino, Kazuma | 3B | Free Agent | 26 | 08/27/1990 | Yamato | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Kinugasa, Yoshinobu | 1B | Free Agent | 19 | 10/01/1997 | Kashima | JPN | Right | Right | 5' 10" | 195 lbs | - |
| Kitakawa, Hikaru | 3B | Hokkaido Nippon-Ham Fighters | 29 | 05/05/1987 | Sagamihara | JPN | Right | Right | 5' 10" | 190 lbs | - |
| Kitamura, Harumi | C | ORIX Buffaloes | 31 | 11/29/1985 | Ina | JPN | Right | Right | 6' 4" | 225 lbs | - |
| Kitamura, Matsuyo | 2B | Free Agent | 30 | 02/05/1986 | Matsubara | JPN | Right | Right | 6' 0" | 174 lbs | - |
| Kitamura, Takuya | LF | Free Agent | 25 | 01/28/1991 | Ushiku | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Kitamura, Tomiji | CF | Free Agent | 35 | 07/09/1981 | Kosei | JPN | Left | Left | 5' 9" | 181 lbs | - |
| Kitamura, Tsuginori | MR | Free Agent | 18 | 11/13/1998 | Kamakura | JPN | Right | Right | 5' 11" | 205 lbs | - |
| Kito, Yoichibei | 3B | Free Agent | 20 | 04/04/1996 | Fujinomiya | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Kiyohara, Mamoru | RF | Free Agent | 35 | 10/03/1981 | Hadano | JPN | Left | Left | 6' 4" | 229 lbs | - |
| Kiyohara, Sugimoto | 3B | Chunichi Dragons | 36 | 06/23/1980 | Iizuka | JPN | Right | Right | 6' 1" | 213 lbs | - |
| Kiyomizu, Akira | CF | Free Agent | 36 | 02/14/1980 | Sakura | JPN | Right | Right | 6' 4" | 212 lbs | - |
| Kiyomizu, Hirotsugu | 1B | Free Agent | 28 | 09/02/1988 | Kozakai | JPN | Left | Left | 6' 0" | 223 lbs | - |
| Kiyomizu, Kazuhiro | LF | Free Agent | 33 | 11/22/1983 | Osaka | JPN | Right | Right | 6' 0" | 194 lbs | - |
| Kiyomizu, Masaaki | 1B | Chunichi Dragons | 32 | 12/10/1984 | Kanazawa | JPN | Left | Left | 6' 2" | 245 lbs | - |
| Kiyomizu, Matsusuke | CF | Hiroshima Toyo Carp | 29 | 12/30/1987 | Kuwana | JPN | Right | Right | 5' 10" | 185 lbs | - |
| Kiyomizu, Matsuyo | LF | Free Agent | 23 | 11/11/1993 | Kitami | JPN | Left | Left | 6' 2" | 160 lbs | - |
| Kiyomizu, Minoru | C | Free Agent | 37 | 02/25/1979 | Kawanoe | JPN | Switch | Right | 5' 11" | 180 lbs | - |
| Kiyomizu, Noritada | LF | ORIX Buffaloes | 36 | 07/18/1980 | Fukushima | JPN | Right | Right | 6' 3" | 220 lbs | - |
| Kiyomizu, Noritoshi | CF | Tokyo Yakult Swallows | 21 | 01/25/1995 | Kasuga | JPN | Left | Left | 5' 9" | 185 lbs | - |
| Kiyomizu, Shinji | 3B | Free Agent | 35 | 09/12/1981 | Kuroishi | JPN | Right | Right | 5' 10" | 199 lbs | - |
| Kiyomizu, Shunen | LF | Free Agent | 25 | 01/08/1991 | Tokushima | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kiyomizu, Takechi | SS | Free Agent | 26 | 09/18/1990 | Akiruno | JPN | Right | Right | 5' 11" | 195 lbs | - |
| Kiyomizu, Toyokuni | SS | Free Agent | 25 | 01/10/1991 | Osaka | JPN | Left | Right | 6' 2" | 155 lbs | - |
| Kiyomizu, Yasukazu | 2B | Hokkaido Nippon-Ham Fighters | 22 | 04/20/1994 | Tokai | JPN | Right | Right | 6' 0" | 170 lbs | - |
| Kiyomizu, Yoshinaka | RF | Free Agent | 28 | 04/08/1988 | Osaka | JPN | Right | Right | 6' 2" | 210 lbs | - |
| Kobayashi, Isoruko | 1B | Hiroshima Toyo Carp | 25 | 04/27/1991 | Tokyo | JPN | Left | Right | 6' 2" | 225 lbs | - |
| Kobayashi, Jotaro | SP | Free Agent | 27 | 11/06/1989 | Okayama | JPN | Right | Right | 6' 7" | 210 lbs | - |
| Kobayashi, Kazuyoshi | 1B | ORIX Buffaloes | 19 | 09/11/1997 | Osaka | JPN | Left | Left | 6' 1" | 205 lbs | - |
| Kobayashi, Kei | RF | Free Agent | 26 | 02/06/1990 | Ebetsu | JPN | Right | Right | 5' 10" | 169 lbs | - |
| Kobayashi, Kiyoemon | SP | Free Agent | 27 | 05/08/1989 | Tokyo | JPN | Right | Left | 6' 1" | 185 lbs | - |
| Kobayashi, Kosami | CF | Tohoku Rakuten Golden Eagles | 35 | 02/17/1981 | Higashiosaka | JPN | Switch | Right | 6' 1" | 200 lbs | - |
| Kobayashi, Masami | 1B | Free Agent | 20 | 10/03/1996 | Tokyo | JPN | Switch | Right | 6' 2" | 235 lbs | - |
| Kobayashi, Matsusuke | SP | Chiba Lotte Marines | 34 | 04/18/1982 | Saitama | JPN | Right | Right | 6' 5" | 230 lbs | - |
| Kobayashi, Matsuyo | MR | Free Agent | 18 | 10/27/1998 | Sayama | JPN | Left | Right | 5' 11" | 210 lbs | - |
| Kobayashi, Mushanokoji | C | Free Agent | 21 | 04/19/1995 | Tokyo | JPN | Right | Right | 6' 0" | 205 lbs | - |
| Kobayashi, Nobuhiko | SP | Free Agent | 24 | 04/27/1992 | Tokyo | JPN | Right | Right | 6' 2" | 207 lbs | - |
| Kobayashi, Nobuhito | MR | Free Agent | 35 | 10/09/1981 | Showa | JPN | Left | Left | 5' 8" | 217 lbs | - |
| Kobayashi, Sotan | MR | Free Agent | 24 | 04/18/1992 | Soja | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Kobayashi, Sukenobu | 1B | Free Agent | 33 | 04/21/1983 | Hatsukaichi | JPN | Left | Right | 6' 4" | 211 lbs | - |
| Kobayashi, Tadaaki | CF | Free Agent | 21 | 01/04/1995 | Sagamihara | JPN | Right | Right | 6' 0" | 170 lbs | - |
| Kobayashi, Tadakuni | 2B | Chunichi Dragons | 22 | 04/20/1994 | Takaoka | JPN | Right | Right | 5' 11" | 175 lbs | - |
| Kobayashi, Tadasu | C | Yokohama Bay Stars | 22 | 09/28/1994 | Kitakyushu | JPN | Right | Right | 5' 9" | 180 lbs | - |
| Kobayashi, Tokuma | CF | Tokyo Yakult Swallows | 33 | 09/03/1983 | Fukuoka | JPN | Right | Right | 5' 10" | 200 lbs | - |
| Kobayashi, Tokutomi | SP | Tohoku Rakuten Golden Eagles | 28 | 06/11/1988 | Nagoya | JPN | Right | Left | 6' 3" | 195 lbs | - |
| Kobayashi, Ton | 1B | Free Agent | 30 | 08/22/1986 | Izumo | JPN | Left | Right | 6' 1" | 164 lbs | - |
| Kobayashi, Toshikuni | LF | Free Agent | 36 | 04/17/1980 | Imabari | JPN | Switch | Right | 6' 1" | 185 lbs | - |
| Kobayashi, Tsurayuki | RF | Free Agent | 33 | 06/21/1983 | Yubari | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kobayashi, Yoichibei | SP | Free Agent | 23 | 03/18/1993 | Yokohama | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Kobayashi, Yoshiki | SP | Fukuoka SoftBank Hawks | 26 | 09/15/1990 | Sasebo | JPN | Right | Right | 5' 9" | 195 lbs | - |
| Koda, Shinsaku | 2B | Hanshin Tigers | 25 | 11/13/1991 | Sendai | JPN | Left | Right | 6' 1" | 185 lbs | - |
| Koda, Shotaro | SP | Free Agent | 35 | 07/27/1981 | Fukuchiyama | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Koda, Shunsho | MR | Free Agent | 31 | 09/10/1985 | Tokyo | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Koda, Sosuke | MR | Free Agent | 19 | 04/02/1997 | Sanyo | JPN | Right | Left | 6' 1" | 215 lbs | - |
| Koda, Tsunesaburo | MR | Free Agent | 35 | 05/13/1981 | Kitakyushu | JPN | Left | Left | 6' 1" | 194 lbs | - |
| Kodama, Yoshihide | 2B | Free Agent | 20 | 04/26/1996 | Hanamaki | JPN | Right | Right | 5' 11" | 200 lbs | - |
| Kodama, Yoshihiro | 3B | Free Agent | 30 | 11/14/1986 | Kobe | JPN | Right | Right | 6' 0" | 189 lbs | - |
| Koga, Sosa | MR | Free Agent | 17 | 03/26/1999 | Nishinomiya | JPN | Right | Right | 5' 10" | 210 lbs | - |
| Koga, Tsutomu | LF | Free Agent | 34 | 12/25/1982 | Mishima | JPN | Left | Left | 6' 5" | 201 lbs | - |
| Kogawa, Kenji | 1B | Free Agent | 22 | 09/11/1994 | Urayasu | JPN | Right | Right | 5' 11" | 205 lbs | - |
| Kogawa, Kosami | 1B | Free Agent | 22 | 09/23/1994 | Morioka | JPN | Right | Right | 6' 6" | 210 lbs | - |
| Kohara, Kinzo | LF | Chiba Lotte Marines | 21 | 12/16/1995 | Fuji | JPN | Right | Right | 5' 11" | 165 lbs | - |
| Kohara, Sojuro | 1B | Free Agent | 35 | 12/12/1981 | Oita | JPN | Left | Left | 6' 4" | 217 lbs | - |
| Kohno, Matsudaira | MR | Free Agent | 24 | 02/03/1992 | Narita | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Koike, Akio | 2B | ORIX Buffaloes | 25 | 07/21/1991 | Tsuchiura | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Koike, Kunimatsu | MR | Free Agent | 32 | 09/08/1984 | Neyagawa | JPN | Left | Right | 6' 7" | 212 lbs | - |
| Koike, Nakazo | SP | Free Agent | 36 | 11/10/1980 | Osaka | JPN | Right | Left | 5' 10" | 200 lbs | - |
| Koike, Seinosuke | CF | Free Agent | 19 | 12/09/1997 | Ichinomiya | JPN | Right | Right | 5' 10" | 180 lbs | - |
| Koizumi, Daisuke | LF | Hokkaido Nippon-Ham Fighters | 20 | 07/29/1996 | Tokyo | JPN | Right | Right | 6' 2" | 185 lbs | - |
| Koizumi, Hiroyuki | SS | Hanshin Tigers | 36 | 12/03/1980 | Sakaiminato | JPN | Right | Right | 6' 3" | 217 lbs | - |
| Koizumi, Hyobe | 1B | Free Agent | 21 | 12/31/1995 | Nagasaki | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Koizumi, Nobuatsu | MR | Free Agent | 32 | 03/11/1984 | Kurume | JPN | Left | Left | 6' 7" | 196 lbs | - |
| Koizumi, Toshiro | RF | Free Agent | 27 | 11/05/1989 | Nogi | JPN | Left | Left | 6' 1" | 197 lbs | - |
| Kojima, Kiyoshi | MR | Free Agent | 17 | 12/22/1999 | Higashiosaka | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Kojima, Mitsukuni | SS | Tohoku Rakuten Golden Eagles | 26 | 07/09/1990 | Oda | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kokawa, Hirokichi | 1B | Free Agent | 19 | 10/19/1997 | Saitama | JPN | Left | Left | 6' 2" | 220 lbs | - |
| Kokawa, Kiichi | LF | Free Agent | 25 | 04/25/1991 | Hirosaki | JPN | Left | Left | 6' 1" | 195 lbs | - |
| Kokawa, Kosami | SP | Free Agent | 30 | 06/19/1986 | Neyagawa | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Kokawa, Motoyuki | 1B | Free Agent | 31 | 02/01/1985 | Itsukaichi | JPN | Right | Right | 6' 3" | 190 lbs | - |
| Kokawa, Ryozo | 2B | Chiba Lotte Marines | 18 | 08/19/1998 | Sapporo | JPN | Right | Right | 5' 10" | 180 lbs | - |
| Kokawa, Shunsho | 2B | Yomiuri Giants | 32 | 07/01/1984 | Tokyo | JPN | Right | Right | 6' 1" | 220 lbs | - |
| Kokawa, Tekkan | C | Free Agent | 21 | 03/04/1995 | Higashiosaka | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Kokawa, Tsugahara | MR | Yomiuri Giants | 35 | 08/25/1981 | Kanzaki | JPN | Right | Right | 6' 2" | 220 lbs | - |
| Kokawa, Tsunayoshi | RF | Free Agent | 29 | 01/26/1987 | Amagasaki | JPN | Left | Left | 6' 2" | 197 lbs | - |
| Kokawa, Yasukazu | MR | Free Agent | 31 | 05/03/1985 | Kobe | JPN | Right | Right | 6' 1" | 188 lbs | - |
| Komatsu, Kichisaburo | CF | Free Agent | 26 | 05/21/1990 | Nagoya | JPN | Left | Right | 6' 0" | 175 lbs | - |
| Komura, Tsutomu | CF | Yomiuri Giants | 23 | 12/16/1993 | Shimizu | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Kondo, Hiroya | CF | Free Agent | 34 | 05/14/1982 | Tomigusuku | JPN | Left | Left | 6' 2" | 214 lbs | - |
| Kondo, Katsuhito | 3B | Tokyo Yakult Swallows | 31 | 08/24/1985 | Nagasaki | JPN | Right | Right | 6' 0" | 220 lbs | - |
| Kondo, Kazuyuki | 1B | Chiba Lotte Marines | 28 | 05/29/1988 | Tokyo | JPN | Right | Right | 6' 4" | 240 lbs | - |
| Kondo, Yoriie | CF | Free Agent | 33 | 04/02/1983 | Taishi | JPN | Right | Right | 6' 0" | 187 lbs | - |
| Konishi, Satoru | 1B | ORIX Buffaloes | 28 | 12/24/1988 | Kurashiki | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Konishi, Sen | MR | Free Agent | 25 | 09/09/1991 | Nagaizumi | JPN | Right | Right | 6' 0" | 215 lbs | - |
| Kono, Kazuhiko | LF | Free Agent | 26 | 12/01/1990 | Tokyo | JPN | Right | Right | 6' 3" | 150 lbs | - |
| Kono, Naonobu | LF | Tohoku Rakuten Golden Eagles | 21 | 11/11/1995 | Nagasaki | JPN | Switch | Right | 6' 3" | 190 lbs | - |
| Kono, Norio | 1B | Free Agent | 25 | 05/23/1991 | Tokyo | JPN | Right | Left | 6' 5" | 185 lbs | - |
| Kono, Teruo | RF | Free Agent | 32 | 11/22/1984 | Inzai | JPN | Left | Left | 6' 2" | 191 lbs | - |
| Kouda, Akihiro | SP | Free Agent | 23 | 02/18/1993 | Inagi | JPN | Left | Left | 5' 10" | 195 lbs | - |
| Kouda, Ichiyo | SS | Free Agent | 35 | 06/27/1981 | Musashino | JPN | Right | Right | 6' 1" | 216 lbs | - |
| Kouda, Koshiro | SP | Hanshin Tigers | 19 | 05/25/1997 | Yamato | JPN | Left | Left | 6' 1" | 210 lbs | - |
| Kouda, Shigeru | SS | Free Agent | 24 | 03/22/1992 | Konan | JPN | Right | Right | 6' 0" | 220 lbs | - |
| Kouda, Takafumi | CF | Free Agent | 19 | 09/01/1997 | Tokyo | JPN | Right | Right | 5' 9" | 180 lbs | - |
| Kouda, Tatsuya | 2B | Free Agent | 17 | 01/19/1999 | Tokyo | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Kouki, Takuji | MR | Free Agent | 17 | 10/01/1999 | Hamamatsu | JPN | Right | Right | 6' 8" | 205 lbs | - |
| Koumura, Akihiro | LF | Free Agent | 28 | 04/30/1988 | Iwaki | JPN | Right | Right | 6' 3" | 226 lbs | - |
| Koumura, Isamu | CF | Chunichi Dragons | 18 | 07/31/1998 | Ichihara | JPN | Switch | Right | 6' 0" | 225 lbs | - |
| Koumura, Katsuyoshi | SS | Free Agent | 21 | 06/30/1995 | Kawasaki | JPN | Right | Right | 6' 2" | 160 lbs | - |
| Kouno, Kazuhiro | SP | Tokyo Yakult Swallows | 22 | 12/17/1994 | Hadano | JPN | Left | Right | 6' 3" | 195 lbs | - |
| Kouno, Nobuhisa | SS | Yokohama Bay Stars | 29 | 08/11/1987 | Sowa | JPN | Right | Right | 6' 0" | 215 lbs | - |
| Kouno, Tsurayaki | MR | Free Agent | 24 | 10/04/1992 | Tamamura | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Kouyama, Isoruko | 1B | Tokyo Yakult Swallows | 25 | 11/17/1991 | Ashikaga | JPN | Right | Right | 6' 3" | 215 lbs | - |
| Kouyama, Kiyotaka | LF | Free Agent | 34 | 11/16/1982 | Kawaguchi | JPN | Right | Right | 6' 4" | 231 lbs | - |
| Kouyama, Yo | 2B | Free Agent | 29 | 08/13/1987 | Funabashi | JPN | Right | Right | 6' 3" | 216 lbs | - |
| Koyama, Mitsuzuka | 3B | Chiba Lotte Marines | 28 | 03/20/1988 | Fukushima | JPN | Left | Right | 6' 0" | 180 lbs | - |
| Koyama, Norio | C | Free Agent | 37 | 12/26/1979 | Matsuura | JPN | Right | Right | 6' 0" | 229 lbs | - |
| Koyama, Sadayoshi | MR | Free Agent | 29 | 02/14/1987 | Morioka | JPN | Left | Left | 6' 1" | 220 lbs | - |
| Kozawa, Natsume | SS | Yomiuri Giants | 30 | 11/03/1986 | Kobe | JPN | Right | Right | 6' 2" | 190 lbs | - |
| Kozawa, Sakutaro | MR | Chiba Lotte Marines | 20 | 11/11/1996 | Akita | JPN | Left | Left | 6' 0" | 190 lbs | - |
| Kubota, Tsunesaburo | MR | Fukuoka SoftBank Hawks | 19 | 02/09/1997 | Tokyo | JPN | Right | Left | 5' 9" | 170 lbs | - |
| Kubota, Yodo | 2B | Hanshin Tigers | 27 | 09/30/1989 | Gifu | JPN | Right | Right | 5' 10" | 202 lbs | - |
| Kubota, Yosuke | MR | Free Agent | 26 | 03/01/1990 | Sapporo | JPN | Right | Right | 6' 1" | 188 lbs | - |
| Kudo, Akira | RF | Free Agent | 35 | 01/31/1981 | Yokohama | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Kudo, Katsunosuki | SS | Free Agent | 34 | 07/20/1982 | Hirakata | JPN | Right | Right | 5' 11" | 205 lbs | - |
| Kudo, Tsuginori | RF | Free Agent | 31 | 05/23/1985 | Hyuga | JPN | Right | Right | 6' 6" | 205 lbs | - |
| Kuhabara, Narihari | C | Free Agent | 31 | 11/18/1985 | Shimoda | JPN | Switch | Right | 6' 0" | 187 lbs | - |
| Kuhabara, Tetsuo | MR | Free Agent | 33 | 11/21/1983 | Musashino | JPN | Right | Right | 5' 10" | 201 lbs | - |
| Kumagai, Kojuro | C | Yomiuri Giants | 35 | 06/21/1981 | Kannami | JPN | Right | Right | 6' 1" | 207 lbs | - |
| Kumagai, Masayuki | LF | Free Agent | 34 | 02/13/1982 | Kasugai | JPN | Left | Right | 6' 4" | 228 lbs | - |
| Kumagai, Matsu | LF | Yokohama Bay Stars | 21 | 02/08/1995 | Osaka | JPN | Left | Right | 6' 3" | 185 lbs | - |
| Kumagai, Mokichi | 2B | Free Agent | 32 | 06/04/1984 | Aso | JPN | Right | Right | 6' 0" | 201 lbs | - |
| Kumagai, Yodo | C | Free Agent | 35 | 03/22/1981 | Tokyo | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Kumatani, Kunimatsu | SS | Hanshin Tigers | 22 | 07/02/1994 | Yotsukaido | JPN | Right | Right | 6' 0" | 220 lbs | - |
| Kurota, Tsuneari | 2B | Free Agent | 20 | 07/12/1996 | Tsuruga | JPN | Right | Right | 5' 11" | 205 lbs | - |
| Kuwabara, Okura | RF | Free Agent | 23 | 11/14/1993 | Takahashi | JPN | Left | Left | 5' 11" | 195 lbs | - |
| Kuwabara, Shihei | 1B | Free Agent | 23 | 07/20/1993 | Himi | JPN | Switch | Right | 6' 6" | 213 lbs | - |