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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Oda, Masazumi | SS | Free Agent | 19 | 10/30/1997 | Nagoya | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Ogasahara, Kenkichi | LF | Free Agent | 27 | 01/21/1989 | Hamamatsu | JPN | Switch | Right | 6' 0" | 220 lbs | - |
| Ogasahara, Masafumi | RF | Free Agent | 21 | 07/26/1995 | Yokosuka | JPN | Right | Right | 5' 11" | 200 lbs | - |
| Ogasahara, Masujiro | SS | Free Agent | 32 | 06/17/1984 | Kamakura | JPN | Right | Right | 6' 1" | 213 lbs | - |
| Ogasahara, Shinji | RF | Free Agent | 34 | 09/16/1982 | Kobe | JPN | Left | Left | 6' 1" | 211 lbs | - |
| Ogasahara, Tanzan | SS | Tokyo Yakult Swallows | 28 | 12/07/1988 | Tokyo | JPN | Switch | Right | 5' 11" | 220 lbs | - |
| Ogawa, Tokugawa | SS | Free Agent | 22 | 04/12/1994 | Ujiie | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Ogawa, Yuichi | RF | Free Agent | 25 | 06/05/1991 | Tokyo | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Ogura, Kokushi | SP | Free Agent | 36 | 01/02/1980 | Yokohama | JPN | Left | Left | 6' 2" | 205 lbs | - |
| Ogura, Mutsuhito | 2B | Free Agent | 28 | 04/21/1988 | Chiba | JPN | Right | Right | 6' 0" | 186 lbs | - |
| Ogyu, Mushanokoji | SP | Free Agent | 23 | 08/25/1993 | Nakagawa | JPN | Right | Right | 6' 0" | 165 lbs | - |
| Ohara, Kimi | CF | Free Agent | 26 | 05/11/1990 | Tsu | JPN | Left | Left | 6' 0" | 212 lbs | - |
| Ohara, Tsurayuki | MR | Free Agent | 17 | 07/23/1999 | Nagoya | JPN | Left | Left | 6' 0" | 215 lbs | - |
| Ohayashi, Hiroaki | RF | Free Agent | 34 | 11/30/1982 | Takamatsu | JPN | Left | Left | 6' 0" | 189 lbs | - |
| Ohayashi, Horiuchi | 1B | Free Agent | 35 | 11/20/1981 | Hiroshima | JPN | Left | Left | 6' 0" | 217 lbs | - |
| Ohayashi, Isei | SS | Chiba Lotte Marines | 29 | 03/27/1987 | Sasebo | JPN | Switch | Right | 6' 2" | 217 lbs | - |
| Ohayashi, Kazuhiro | LF | Free Agent | 34 | 10/27/1982 | Nagayo | JPN | Right | Right | 6' 0" | 189 lbs | - |
| Ohayashi, Kensaku | MR | Free Agent | 22 | 09/26/1994 | Sakai | JPN | Left | Left | 5' 11" | 215 lbs | - |
| Ohayashi, Kinji | MR | Free Agent | 35 | 06/11/1981 | Osaka | JPN | Left | Left | 5' 8" | 188 lbs | - |
| Ohayashi, Kiyonaga | LF | Free Agent | 35 | 10/30/1981 | Ibaraki | JPN | Right | Right | 6' 4" | 210 lbs | - |
| Ohayashi, Koki | RF | Free Agent | 29 | 03/11/1987 | Chiba | JPN | Left | Left | 6' 0" | 201 lbs | - |
| Ohayashi, Kyoji | SP | Free Agent | 20 | 01/23/1996 | Tokyo | JPN | Switch | Right | 6' 1" | 245 lbs | - |
| Ohayashi, Mito | SP | Hokkaido Nippon-Ham Fighters | 35 | 06/23/1981 | Kiryu | JPN | Right | Right | 6' 5" | 210 lbs | - |
| Ohayashi, Mototsune | MR | Free Agent | 32 | 10/13/1984 | Matsusaka | JPN | Right | Right | 6' 2" | 188 lbs | - |
| Ohayashi, Naonobu | LF | Free Agent | 22 | 07/11/1994 | Kasugai | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Ohayashi, Satoshi | 2B | Free Agent | 19 | 12/25/1997 | Nagoya | JPN | Right | Right | 5' 8" | 190 lbs | - |
| Ohayashi, Senichi | 3B | Free Agent | 27 | 11/20/1989 | Sakura | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Ohayashi, Shinsui | 2B | Free Agent | 34 | 09/26/1982 | Hamamatsu | JPN | Right | Right | 6' 0" | 198 lbs | - |
| Ohayashi, Sho | MR | Free Agent | 27 | 12/14/1989 | Matsudo | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Ohayashi, Soetsu | RF | Free Agent | 28 | 01/29/1988 | Wako | JPN | Right | Right | 6' 2" | 171 lbs | - |
| Ohayashi, Sotatsu | SP | Hanshin Tigers | 19 | 01/24/1997 | Hiroshima | JPN | Right | Right | 5' 10" | 195 lbs | - |
| Ohayashi, Tashiaki | MR | Free Agent | 23 | 09/13/1993 | Sapporo | JPN | Right | Right | 5' 8" | 200 lbs | - |
| Ohayashi, Toyoharu | RF | Free Agent | 29 | 01/29/1987 | Yokosuka | JPN | Left | Left | 6' 4" | 232 lbs | - |
| Ohayashi, Yoshii | 3B | Tokyo Yakult Swallows | 36 | 06/27/1980 | Tsubame | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Ohayashi, Yoshinori | 3B | Tokyo Yakult Swallows | 32 | 12/21/1984 | Maruoka | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Oike, Shunsho | MR | Chiba Lotte Marines | 25 | 08/23/1991 | Fukuoka | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Oike, Tabito | SS | Free Agent | 35 | 02/14/1981 | Higashimatsuyama | JPN | Right | Right | 6' 1" | 194 lbs | - |
| Oishi, Kuemon | MR | Free Agent | 22 | 06/17/1994 | Takarazuka | JPN | Right | Right | 6' 3" | 175 lbs | - |
| Oishi, Masuhiro | SP | Chiba Lotte Marines | 35 | 12/08/1981 | Yokohama | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Oishi, Shiro | C | Free Agent | 28 | 06/12/1988 | Toyokawa | JPN | Right | Right | 5' 11" | 184 lbs | - |
| Oishi, Tatsui | MR | Free Agent | 34 | 03/13/1982 | Tomiya | JPN | Right | Right | 6' 3" | 231 lbs | - |
| Oishi, Yoichi | 2B | Free Agent | 22 | 09/24/1994 | Miharu | JPN | Right | Right | 6' 1" | 155 lbs | - |
| Oishi, Yukio | MR | Free Agent | 32 | 03/18/1984 | Oyama | JPN | Right | Left | 5' 8" | 183 lbs | - |
| Ojima, Kanzaburo | LF | Fukuoka SoftBank Hawks | 29 | 07/08/1987 | Hamamatsu | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Ojima, Soshu | SS | Saitama Seibu Lions | 29 | 09/20/1987 | Yokohama | JPN | Switch | Right | 6' 0" | 215 lbs | - |
| Ojima, Takiji | LF | Hiroshima Toyo Carp | 20 | 11/25/1996 | Kobe | JPN | Right | Right | 6' 2" | 180 lbs | - |
| Oka, Eiji | MR | Free Agent | 34 | 11/01/1982 | Kikugawa | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Oka, Keisuke | 2B | Free Agent | 25 | 06/27/1991 | Fukuoka | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Oka, Kingo | 2B | Yokohama Bay Stars | 28 | 03/05/1988 | Oga | JPN | Left | Right | 6' 0" | 198 lbs | - |
| Okabe, Akihisa | SP | Tohoku Rakuten Golden Eagles | 25 | 09/24/1991 | Nagasaki | JPN | Right | Right | 5' 10" | 190 lbs | - |
| Okabe, Kyoichi | RF | Free Agent | 21 | 04/22/1995 | Kuki | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Okada, Hiroyuki | 2B | Free Agent | 17 | 07/24/1999 | Tokyo | JPN | Left | Right | 6' 0" | 170 lbs | - |
| Okada, Ieyasu | SP | Free Agent | 23 | 03/19/1993 | Maebashi | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Okada, Kitahachi | 2B | Free Agent | 25 | 02/12/1991 | Chiba | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Okada, Kosaku | LF | Free Agent | 21 | 10/02/1995 | Ina | JPN | Left | Right | 6' 0" | 180 lbs | - |
| Okada, Manabu | CF | Free Agent | 23 | 02/14/1993 | Osaka | JPN | Right | Right | 5' 8" | 175 lbs | - |
| Okada, Masayoshi | RF | Free Agent | 35 | 09/24/1981 | Matsue | JPN | Left | Left | 6' 0" | 192 lbs | - |
| Okada, Naganori | 2B | Free Agent | 36 | 09/15/1980 | Tokyo | JPN | Left | Right | 5' 9" | 190 lbs | - |
| Okada, Shunji | RF | Free Agent | 26 | 09/20/1990 | Funabashi | JPN | Left | Left | 6' 2" | 195 lbs | - |
| Okada, Yosuke | CL | Tokyo Yakult Swallows | 31 | 05/26/1985 | Tsuchiura | JPN | Right | Right | 6' 1" | 203 lbs | - |
| Okamoto, Kentaro | SS | Free Agent | 21 | 05/12/1995 | Ota | JPN | Right | Right | 5' 9" | 190 lbs | - |
| Okamoto, Masamichi | 1B | Hiroshima Toyo Carp | 22 | 04/25/1994 | Ikoma | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Okamoto, Toshiki | 3B | Chiba Lotte Marines | 29 | 01/24/1987 | Tokyo | JPN | Switch | Right | 6' 1" | 185 lbs | - |
| Okamoto, Tsugahara | C | Tohoku Rakuten Golden Eagles | 28 | 07/23/1988 | Hozumi | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Okamoto, Yoshihiro | LF | Free Agent | 29 | 03/07/1987 | Ayabe | JPN | Left | Left | 6' 2" | 163 lbs | - |
| Okawa, Kuemon | 1B | Free Agent | 30 | 05/18/1986 | Saitama | JPN | Left | Right | 6' 1" | 201 lbs | - |
| Okazaki, Taheiji | 2B | Free Agent | 30 | 09/06/1986 | Yokkaichi | JPN | Right | Right | 6' 0" | 208 lbs | - |
| Okubo, Akihisa | LF | Tokyo Yakult Swallows | 26 | 04/17/1990 | Takasago | JPN | Right | Right | 5' 11" | 190 lbs | - |
| Okubo, Kantaro | C | Free Agent | 35 | 05/26/1981 | Fukuoka | JPN | Right | Right | 6' 1" | 203 lbs | - |
| Okubo, Taizo | LF | Free Agent | 27 | 01/26/1989 | Yotsukaido | JPN | Right | Right | 6' 2" | 210 lbs | - |
| Okubo, Tsugumichi | CF | Free Agent | 35 | 01/15/1981 | Tsuyama | JPN | Right | Right | 6' 0" | 204 lbs | - |
| Okumura, Hidekazu | CF | Hiroshima Toyo Carp | 30 | 08/27/1986 | Sakura | JPN | Right | Right | 6' 2" | 165 lbs | - |
| Okumura, Hiroyuki | SP | Free Agent | 22 | 12/24/1994 | Yokohama | JPN | Right | Right | 6' 2" | 215 lbs | - |
| Okumura, Hoshi | 3B | Free Agent | 22 | 05/10/1994 | Hitachi | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Okumura, Yoshiaga | MR | Free Agent | 28 | 09/18/1988 | Tokyo | JPN | Switch | Right | 6' 5" | 214 lbs | - |
| Okuno, Kuniaki | RF | Free Agent | 22 | 02/20/1994 | Suzuka | JPN | Right | Right | 5' 8" | 185 lbs | - |
| Okuta, Tadaaki | LF | Free Agent | 27 | 02/04/1989 | Chofu | JPN | Right | Right | 6' 0" | 206 lbs | - |
| Omori, Izo | 1B | Free Agent | 22 | 03/18/1994 | Hachinohe | JPN | Switch | Left | 6' 6" | 240 lbs | - |
| Omori, Taro | SS | Yokohama Bay Stars | 21 | 10/18/1995 | Koriyama | JPN | Right | Right | 6' 1" | 180 lbs | - |
| Omori, Teruo | LF | Free Agent | 26 | 07/19/1990 | Osaka | JPN | Switch | Right | 6' 3" | 205 lbs | - |
| Onishi, Sawao | MR | Free Agent | 19 | 08/15/1997 | Sanda | JPN | Right | Right | 5' 11" | 220 lbs | - |
| Ono, Masashige | LF | Free Agent | 31 | 05/20/1985 | Fukushima | JPN | Left | Right | 5' 11" | 203 lbs | - |
| Ono, Naosuke | CL | Free Agent | 33 | 02/27/1983 | Tsukuba | JPN | Left | Left | 6' 4" | 218 lbs | - |
| Ono, Takuro | LF | Free Agent | 20 | 09/22/1996 | Higashiosaka | JPN | Left | Left | 6' 5" | 180 lbs | - |
| Ono, Toshikasu | LF | Free Agent | 25 | 10/15/1991 | Kumagaya | JPN | Left | Left | 6' 1" | 225 lbs | - |
| Ono, Toshitsugu | MR | Free Agent | 23 | 11/29/1993 | Saitama | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Onodera, Tanyu | CF | Free Agent | 25 | 08/14/1991 | Toki | JPN | Right | Right | 6' 0" | 150 lbs | - |
| Osada, Kantaro | MR | Free Agent | 23 | 07/04/1993 | Isesaki | JPN | Switch | Right | 6' 0" | 185 lbs | - |
| Osada, Taro | MR | Free Agent | 31 | 07/14/1985 | Kameoka | JPN | Right | Right | 6' 1" | 202 lbs | - |
| Osawa, Kenkichi | RF | Free Agent | 22 | 11/28/1994 | Ofunato | JPN | Left | Left | 6' 0" | 195 lbs | - |
| Osawa, Kensaku | C | Free Agent | 37 | 08/16/1979 | Matsudo | JPN | Right | Right | 6' 0" | 215 lbs | - |
| Osawa, Nakazo | MR | Fukuoka SoftBank Hawks | 20 | 02/16/1996 | Koshigaya | JPN | Right | Right | 5' 10" | 190 lbs | - |
| Osawa, Nobuhito | RF | Free Agent | 34 | 04/02/1982 | Buzen | JPN | Left | Left | 6' 0" | 195 lbs | - |
| Oshima, Eiichi | 1B | Chunichi Dragons | 21 | 04/16/1995 | Kuwana | JPN | Left | Left | 6' 2" | 245 lbs | - |
| Oshima, Michinori | MR | Free Agent | 32 | 03/16/1984 | Utsunomiya | JPN | Right | Right | 6' 3" | 210 lbs | - |
| Oshima, Noriyuki | LF | Free Agent | 27 | 03/14/1989 | Tsuruoka | JPN | Left | Left | 6' 3" | 200 lbs | - |
| Ota, Sugimoto | 3B | Free Agent | 29 | 01/03/1987 | Takanezawa | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Ota, Tadanobu | LF | Free Agent | 26 | 04/02/1990 | Inuyama | JPN | Right | Right | 6' 0" | 193 lbs | - |
| Otani, Kuemon | 3B | Free Agent | 28 | 05/02/1988 | Gosen | JPN | Right | Right | 6' 2" | 190 lbs | - |
| Otani, Kyuso | MR | Fukuoka SoftBank Hawks | 24 | 05/22/1992 | Higashiosaka | JPN | Right | Right | 5' 8" | 185 lbs | - |
| Otani, Masaru | CF | Saitama Seibu Lions | 34 | 09/01/1982 | Suzu | JPN | Switch | Right | 6' 3" | 195 lbs | - |
| Otani, Nobuo | 3B | Free Agent | 37 | 11/19/1979 | Otsu | JPN | Right | Right | 5' 9" | 195 lbs | - |
| Otsuka, Isamu | SP | Yokohama Bay Stars | 36 | 07/27/1980 | Yashio | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Otsuka, Mitsuzuka | CF | Hanshin Tigers | 20 | 11/13/1996 | Funabashi | JPN | Left | Left | 6' 0" | 210 lbs | - |
| Otsuka, Noboru | 2B | ORIX Buffaloes | 22 | 03/05/1994 | Kameyama | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Otsuka, Satoru | CF | Yokohama Bay Stars | 20 | 06/10/1996 | Fukui | JPN | Switch | Right | 6' 0" | 215 lbs | - |
| Oyama, Kokei | 1B | Tokyo Yakult Swallows | 28 | 06/16/1988 | Matsuura | JPN | Right | Right | 6' 2" | 225 lbs | - |
| Oyama, Narahiko | MR | Free Agent | 31 | 05/03/1985 | Tokyo | JPN | Right | Right | 6' 0" | 216 lbs | - |
| Oyama, Nobuhiko | MR | Free Agent | 28 | 09/08/1988 | Jimokuji | JPN | Switch | Right | 6' 4" | 215 lbs | - |
| Oyama, Shigemasa | 1B | ORIX Buffaloes | 34 | 03/25/1982 | Maebashi | JPN | Left | Left | 6' 4" | 225 lbs | - |
| Oyama, Shiki | SP | Free Agent | 22 | 02/22/1994 | Suita | JPN | Left | Right | 6' 1" | 195 lbs | - |
| Oyama, Yasuo | SP | Free Agent | 29 | 11/29/1987 | Sakai | JPN | Right | Right | 6' 3" | 205 lbs | - |
| Ozaki, Masayoshi | RF | Free Agent | 26 | 11/12/1990 | Chikushino | JPN | Left | Left | 6' 2" | 230 lbs | - |
| Ozaki, Mitsuoki | SS | ORIX Buffaloes | 33 | 11/17/1983 | Chofu | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Ozaki, Nobukazu | MR | Free Agent | 20 | 02/05/1996 | Musashimurayama | JPN | Right | Left | 6' 0" | 225 lbs | - |
| Ozaki, Takanori | MR | Free Agent | 19 | 10/15/1997 | Tokyo | JPN | Right | Right | 6' 2" | 210 lbs | - |
| Ozaki, Toshikazu | MR | Hiroshima Toyo Carp | 29 | 04/02/1987 | Takahashi | JPN | Right | Right | 5' 11" | 215 lbs | - |
| Ozawa, Takiji | 3B | Free Agent | 36 | 12/27/1980 | Isehara | JPN | Right | Right | 5' 10" | 203 lbs | - |

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