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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oakley, Steven | 3B | Chunichi (Ni-Gun) Dragons | 25 | 07/03/1997 | Durham | USA | Right | Right | 6' 3" | 195 lbs | - |
| Oberg, Scott | RP | Yomiuri (Ni-Gun) Giants | 32 | 03/13/1990 | Tewksbury | USA | Right | Right | 6' 2" | 225 lbs | - |
| Obeso, Norberto | 2B | Tokyo Yakult (Ni-Gun) Swallows | 27 | 07/09/1995 | Hermosillo | MEX | Left | Right | 6' 0" | 185 lbs | - |
| Oda, Yeijiro | RP | Free Agent | 26 | 10/30/1996 | Kyoto | JPN | Left | Left | 5' 10" | 180 lbs | - |
| Odaka, Sadao | RP | Free Agent | 23 | 12/25/1998 | Tokyo | JPN | Switch | Right | 6' 0" | 190 lbs | - |
| Ogawa, Ryuya | RP | Free Agent | 31 | 09/03/1991 | Chiba | JPN | Left | Left | 6' 0" | 180 lbs | - |
| Ogawa, Takenao | RP | Chunichi (Ni-Gun) Dragons | 22 | 09/27/2000 | Hiroshima | JPN | Right | Right | 5' 11" | 190 lbs | - |
| Ohashi, Muneyaki | RP | Hokkaido Nippon Ham (Ni-Gun) Fighters | 19 | 03/18/2003 | Ichinoseki | JPN | Left | Left | 6' 2" | 185 lbs | - |
| Ohashi, Naoya | RP | Seibu (Ni-Gun) Lions | 30 | 04/25/1992 | Osaka | JPN | Left | Left | 5' 8" | 165 lbs | - |
| Ohashi, Ryoma | RF | Free Agent | 26 | 10/10/1996 | Oyodo | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Ohayashi, Kazunari | 3B | Yokohama (Ni-Gun) Bay Stars | 20 | 11/27/2001 | Joyo | JPN | Switch | Right | 6' 1" | 195 lbs | - |
| Ohayashi, Keiji | RP | Free Agent | 24 | 05/19/1998 | Yokosuka | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Ohayashi, Kiyoshi | SP | Tokyo Yakult (Ni-Gun) Swallows | 18 | 03/20/2004 | Hiroshima | JPN | Left | Left | 6' 0" | 175 lbs | - |
| Ohayashi, Masaaki | RP | Chiba Lotte (Ni-Gun) Marines | 22 | 12/11/1999 | Nakagawa | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Ohayashi, Masakazu | RP | Tokyo Yakult (Ni-Gun) Swallows | 24 | 02/13/1998 | Matsue | JPN | Left | Right | 6' 2" | 200 lbs | - |
| Ohayashi, Masazumi | RP | Free Agent | 22 | 12/31/1999 | Shiojiri | JPN | Left | Left | 6' 3" | 200 lbs | - |
| Ohayashi, Ogai | 2B | Free Agent | 20 | 10/27/2002 | Saitama | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Ohayashi, Ryunosuke | RP | Free Agent | 28 | 04/12/1994 | Tokyo | JPN | Right | Right | 6' 3" | 220 lbs | - |
| Ohayashi, Toshiyuki | SP | Yomiuri (Ni-Gun) Giants | 17 | 02/10/2005 | Misato | JPN | Right | Left | 5' 10" | 160 lbs | - |
| Ohlman, Michael | C | Free Agent | 31 | 12/14/1990 | Bradenton | USA | Right | Right | 6' 3" | 220 lbs | - |
| Oka, Kansuke | CF | Fukuoka SoftBank (Ni-Gun) Hawks | 19 | 10/08/2003 | Iwaki | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Okabe, Kazutoshi | RP | Tokyo Yakult (Ni-Gun) Swallows | 19 | 08/04/2003 | Fuji | JPN | Left | Right | 6' 0" | 180 lbs | - |
| Okabe, Terumoto | RP | Free Agent | 22 | 05/22/2000 | Funabashi | JPN | Right | Right | 6' 3" | 210 lbs | - |
| Okada, Nobuyori | RF | Yomiuri (Ni-Gun) Giants | 19 | 12/22/2002 | Soka | JPN | Left | Left | 6' 3" | 190 lbs | - |
| Okamoto, Eisuke | CF | Hiroshima Toyo (Ni-Gun) Carp | 23 | 06/20/1999 | Kawachinagano | JPN | Switch | Right | 5' 11" | 185 lbs | - |
| Okamura, Yoriie | 2B | Yokohama (Ni-Gun) Bay Stars | 21 | 11/14/2001 | Yokohama | JPN | Switch | Right | 5' 10" | 170 lbs | - |
| Okazaki, Katsuhito | CF | Yokohama (Ni-Gun) Bay Stars | 18 | 01/04/2004 | Misaki | JPN | Switch | Right | 6' 1" | 175 lbs | - |
| Okumura, Ton | RF | Yomiuri (Ni-Gun) Giants | 24 | 03/22/1998 | Naha | JPN | Left | Left | 6' 2" | 200 lbs | - |
| Okuta, Mototsune | 1B | Tohoku Rakuten (Ni-Gun) Golden Eagles | 21 | 10/17/2001 | Katsuura | JPN | Switch | Right | 6' 0" | 185 lbs | - |
| Okuyama, Motoyuki | RP | Free Agent | 20 | 09/16/2002 | Yaizu | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Olivo, Benito | LF | Free Agent | 28 | 07/11/1994 | Bayaguana | DOM | Right | Right | 6' 0" | 190 lbs | - |
| Olt, Mike | 3B | Free Agent | 34 | 08/27/1988 | Branford | USA | Right | Right | 6' 2" | 210 lbs | - |
| Omine, Shota | SS | Free Agent | 31 | 09/17/1991 | Ishigaki | JPN | Right | Right | 5' 10" | 195 lbs | - |
| Omori, Kiyomori | SS | Yokohama (Ni-Gun) Bay Stars | 21 | 04/20/2001 | Nagoya | JPN | Switch | Right | 6' 0" | 185 lbs | - |
| Omori, Mamoru | RF | Seibu (Ni-Gun) Lions | 20 | 06/07/2002 | Komaki | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Onishi, Masaki | RP | Chunichi (Ni-Gun) Dragons | 25 | 02/13/1997 | Koshigaya | JPN | Right | Right | 6' 3" | 220 lbs | - |
| Ono, Yudai | RP | Free Agent | 34 | 09/26/1988 | Kyoto | JPN | Left | Left | 6' 0" | 190 lbs | - |
| Onodera, Yoshitaka | RP | Free Agent | 26 | 03/20/1996 | Usa | JPN | Right | Right | 5' 10" | 185 lbs | - |
| Ortega, Ariel | SS | Hiroshima Toyo (Ni-Gun) Carp | 25 | 06/20/1997 | Panama | PAN | Right | Right | 5' 10" | 180 lbs | - |
| Ortega, Efrin | 2B | Yomiuri (Ni-Gun) Giants | 25 | 07/20/1997 | San Francisco de Macorís | DOM | Right | Right | 6' 0" | 195 lbs | - |
| Ortiz, Phillip | RP | Free Agent | 27 | 03/06/1995 | Ponce | PUR | Right | Right | 6' 0" | 200 lbs | - |
| Orui, Susumu | 3B | Free Agent | 32 | 08/31/1990 | Sapporo | JPN | Right | Right | 5' 8" | 195 lbs | - |
| Osuna, Roberto | RP | Free Agent | 27 | 02/07/1995 | Juan José Ríos | MEX | Right | Right | 6' 2" | 245 lbs | - |
| Oswalt, Corey | RP | Hokkaido Nippon Ham (Ni-Gun) Fighters | 29 | 09/03/1993 | San Diego | USA | Right | Right | 6' 3" | 205 lbs | - |
| Ota, Atori | RP | Free Agent | 33 | 08/12/1989 | Nishihara | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Ota, Soshu | 2B | Free Agent | 26 | 06/02/1996 | Tokyo | JPN | Right | Right | 6' 0" | 205 lbs | - |
| Otani, Roku | 2B | Yomiuri (Ni-Gun) Giants | 20 | 01/31/2002 | Kyoto | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Ottavino, Adam | RP | Fukuoka SoftBank (Ni-Gun) Hawks | 36 | 11/22/1985 | New York | USA | Right | Right | 6' 5" | 240 lbs | - |
| Otuka, Takahito | RP | Free Agent | 28 | 10/13/1994 | Yame | JPN | Left | Left | 5' 8" | 175 lbs | - |
| Over, Devin | RP | Free Agent | 29 | 01/06/1993 | Windsor Locks | USA | Right | Right | 6' 0" | 190 lbs | - |
| Oviedo, Jorge | RP | Tokyo Yakult (Ni-Gun) Swallows | 26 | 10/06/1996 | Carora | VEN | Left | Left | 6' 2" | 195 lbs | - |
| Oyama, Katsuhiko | 3B | Orix (Ni-Gun) Buffaloes | 19 | 03/08/2003 | Goshogawara | JPN | Right | Right | 5' 10" | 175 lbs | - |
| Oyama, Munoto | RP | Chunichi (Ni-Gun) Dragons | 23 | 12/20/1998 | Kawachi | JPN | Right | Left | 6' 5" | 215 lbs | - |
| Oyama, Shoin | C | Hanshin (Ni-Gun) Tigers | 19 | 04/03/2003 | Fukuoka | JPN | Left | Right | 6' 1" | 200 lbs | - |
| Ozawa, Mito | CF | Tokyo Yakult (Ni-Gun) Swallows | 19 | 10/14/2003 | Yokohama | JPN | Right | Right | 5' 10" | 170 lbs | - |
| Ozawa, Mototsune | LF | Free Agent | 29 | 07/16/1993 | Hadano | JPN | Left | Left | 6' 0" | 215 lbs | - |
