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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oba, Tatsuya | RP | Tokyo Yakult (Ni-Gun) Swallows | 27 | 03/10/1992 | Kawasaki | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Oda, Yuya | CF | Free Agent | 26 | 11/04/1992 | Kumamoto | JPN | Left | Right | 5' 8" | 165 lbs | - |
| Ogasawara, Michihiro | 1B | Free Agent | 42 | 10/25/1976 | Chiba | JPN | Left | Right | 5' 10" | 185 lbs | - |
| Ogawa, Ryuya | RP | Chunichi (Ni-Gun) Dragons | 25 | 09/03/1994 | Chiba | JPN | Left | Left | 6' 0" | 155 lbs | - |
| Ohashi, Naoya | SP | Hiroshima Toyo (Ni-Gun) Carp | 24 | 04/25/1995 | Osaka | JPN | Left | Left | 5' 8" | 170 lbs | - |
| Ohayashi, Kiyotaka | CF | Chiba Lotte (Ni-Gun) Marines | 23 | 11/13/1995 | Inuyama | JPN | Right | Right | 6' 0" | 190 lbs | $50,000 |
| Ohayashi, Shigemori | RP | Chunichi (Ni-Gun) Dragons | 21 | 07/08/1998 | Hagi | JPN | Left | Left | 6' 6" | 215 lbs | - |
| Ojima, Kaoru | SS | Yokohama (Ni-Gun) Bay Stars | 19 | 11/07/1999 | Atsugi | JPN | Left | Right | 6' 0" | 175 lbs | - |
| Oka, Hiromi | 3B | Hokkaido Nippon Ham (Ni-Gun) Fighters | 25 | 07/15/1994 | Okayama | JPN | Right | Right | 6' 0" | 185 lbs | $50,000 |
| Okabe, Kantaro | RP | Tokyo Yakult (Ni-Gun) Swallows | 22 | 06/27/1997 | Nagoya | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Okada, Masatoshi | C | Seibu (Ni-Gun) Lions | 27 | 06/30/1992 | Osaka | JPN | Right | Right | 5' 8" | 175 lbs | $50,000 |
| Okada, Tadamichi | RP | Chiba Lotte (Ni-Gun) Marines | 19 | 12/06/1999 | Kanazawa | JPN | Right | Right | 5' 11" | 170 lbs | - |
| Okada, Yoshifumi | LF | Yomiuri (Ni-Gun) Giants | 32 | 07/06/1987 | Takanezawa | JPN | Left | Left | 5' 10" | 160 lbs | - |
| Okamoto, Katsuhiko | RP | Hiroshima Toyo (Ni-Gun) Carp | 22 | 02/26/1997 | Okinawa | JPN | Right | Right | 6' 3" | 205 lbs | - |
| Okamoto, Kazuma | 3B | Yomiuri (Ni-Gun) Giants | 20 | 06/30/1999 | Gojo | JPN | Right | Right | 5' 11" | 215 lbs | $50,000 |
| Okamoto, Ken | RP | Fukuoka SoftBank (Ni-Gun) Hawks | 23 | 10/29/1995 | Hyuga | JPN | Right | Right | 5' 10" | 185 lbs | - |
| Okazaki, Taichi | 1B | Hanshin (Ni-Gun) Tigers | 33 | 06/20/1986 | Gojo | JPN | Right | Right | 5' 10" | 195 lbs | - |
| Okmura, Nobuyuki | SS | Tokyo Yakult (Ni-Gun) Swallows | 21 | 05/26/1998 | Yamagata | JPN | Left | Right | 5' 10" | 165 lbs | - |
| Okubo, Kazuki | RP | Yomiuri (Ni-Gun) Giants | 21 | 09/16/1998 | Kasukabe | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Okunami, Kyo | 3B | Orix (Ni-Gun) Buffaloes | 21 | 08/29/1998 | Okayama | JPN | Right | Right | 5' 9" | 215 lbs | $50,000 |
| Olvera, Nelson | SP | Free Agent | 26 | 12/30/1992 | Surprise | USA | Right | Right | 6' 1" | 210 lbs | - |
| Omatsu, Shoitsu | LF | Hokkaido Nippon Ham (Ni-Gun) Fighters | 34 | 06/16/1985 | Kanazawa | JPN | Left | Left | 6' 0" | 200 lbs | $50,000 |
| Onishi, Katsuhiko | CF | Orix (Ni-Gun) Buffaloes | 24 | 07/18/1995 | Kobe | JPN | Right | Right | 6' 0" | 200 lbs | $50,000 |
| Onizaki, Yuji | 2B | Tohoku Rakuten (Ni-Gun) Golden Eagles | 33 | 04/07/1986 | Saga | JPN | Left | Right | 5' 10" | 170 lbs | - |
| Ono, Fumiya | SP | Tohoku Rakuten (Ni-Gun) Golden Eagles | 19 | 10/23/1999 | Kurume | JPN | Right | Right | 5' 9" | 155 lbs | - |
| Ono, Shota | C | Fukuoka SoftBank (Ni-Gun) Hawks | 29 | 01/13/1990 | Ogaki | JPN | Right | Right | 5' 10" | 175 lbs | $355,000 |
| Ono, Yudai | SP | Chunichi (Ni-Gun) Dragons | 28 | 09/26/1991 | Kyoto | JPN | Left | Left | 6' 0" | 180 lbs | $275,000 |
| Ontiveros, Jesús | RF | Free Agent | 39 | 08/22/1980 | Tamayo | DOM | Right | Right | 6' 4" | 255 lbs | - |
| Ortíz, Jesús | CF | Hiroshima Toyo (Ni-Gun) Carp | 18 | 02/14/2001 | Largo | USA | Left | Left | 6' 2" | 185 lbs | - |
| Orui, Susumu | SS | Tohoku Rakuten (Ni-Gun) Golden Eagles | 26 | 08/31/1993 | Sapporo | JPN | Right | Right | 5' 8" | 160 lbs | - |
| Osakaya, Hiroki | 3B | Tohoku Rakuten (Ni-Gun) Golden Eagles | 23 | 11/09/1995 | Higashiosaka | JPN | Right | Right | 5' 10" | 185 lbs | - |
| Osaki, Yutaro | LF | Seibu (Ni-Gun) Lions | 31 | 10/18/1987 | Tsukuba | JPN | Left | Right | 5' 6" | 180 lbs | - |
| Ota, Kengo | SS | Hokkaido Nippon Ham (Ni-Gun) Fighters | 19 | 01/19/2000 | Kawagoe | JPN | Left | Right | 6' 0" | 165 lbs | $50,000 |
| Ota, Shigochiyo | CF | Seibu (Ni-Gun) Lions | 20 | 07/08/1999 | Niiza | JPN | Left | Left | 6' 0" | 180 lbs | - |
| Otuka, Takahito | RP | Tohoku Rakuten (Ni-Gun) Golden Eagles | 21 | 10/13/1997 | Yame | JPN | Left | Left | 5' 8" | 160 lbs | - |
| Oyama, Keiji | C | Free Agent | 35 | 11/19/1983 | Sendai | JPN | Right | Right | 5' 8" | 180 lbs | - |
| Oyama, Satoshi | RP | Orix (Ni-Gun) Buffaloes | 27 | 10/06/1991 | Oita | JPN | Left | Left | 5' 6" | 155 lbs | - |
| Ozaki, Masaya | C | Yokohama (Ni-Gun) Bay Stars | 32 | 06/02/1987 | Itami | JPN | Right | Right | 6' 0" | 180 lbs | $55,000 |
| Ozawa, Joji | SS | Seibu (Ni-Gun) Lions | 21 | 01/22/1998 | Sugito | JPN | Right | Right | 6' 0" | 180 lbs | - |
