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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Billy | RF | Tokyo Yakult Swallows | 20 | 12/16/2014 | Anchorage | USA | Left | Left | 6' 3" | 200 lbs | - |
| O'Neil, David | RP | Hokkaido Nippon-Ham Fighters | 22 | 10/15/2012 | Del Rio | USA | Right | Right | 6' 6" | 210 lbs | - |
| Oba, Yozaburo | SS | Hiroshima Toyo Carp | 22 | 10/08/2012 | Koriyama | JPN | Left | Right | 6' 0" | 175 lbs | - |
| Ochiai, Itsuo | RP | Saitama Seibu Lions | 21 | 01/21/2013 | Kawasaki | JPN | Right | Right | 5' 10" | 175 lbs | - |
| Ogasahara, Katsutoshi | RF | Saitama Seibu Lions | 21 | 06/05/2013 | Nishinomiya | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Ogata, Kanbu | SP | Hiroshima Toyo Carp | 19 | 03/04/2015 | Kodaira | JPN | Right | Right | 5' 11" | 170 lbs | - |
| Ogata, Kentaro | CL | Free Agent | 23 | 06/02/2011 | Ichikawa | JPN | Left | Right | 6' 3" | 200 lbs | - |
| Ogawa, Akiharu | RP | Free Agent | 23 | 02/03/2011 | Nabari | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Ogawa, Harukazu | LF | Yokohama Bay Stars | 22 | 12/26/2012 | Miyoshi | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Ogawa, Kanzaburo | RP | Free Agent | 22 | 10/05/2012 | Saitama | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Ogawa, Kojiro | 3B | Fukuoka SoftBank Hawks | 21 | 02/25/2013 | Ichikawa | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Ogino, Taro | RP | Hanshin Tigers | 21 | 05/21/2013 | Sagae | JPN | Left | Right | 6' 4" | 200 lbs | - |
| Ogura, Kiyonori | RF | Hanshin Tigers | 22 | 08/15/2012 | Misato | JPN | Left | Left | 6' 5" | 215 lbs | - |
| Oh, Byung-ki | 1B | Chunichi Dragons | 20 | 06/07/2014 | Ansan | KOR | Left | Left | 6' 2" | 210 lbs | - |
| Ohira, Fumito | RP | Hokkaido Nippon-Ham Fighters | 20 | 05/14/2014 | Kitakami | JPN | Left | Left | 6' 0" | 180 lbs | - |
| Oide, Asakichi | SP | Yokohama Bay Stars | 22 | 06/15/2012 | Nishinomiya | JPN | Right | Right | 6' 2" | 190 lbs | - |
| Okamura, Minoru | RP | Free Agent | 23 | 08/15/2011 | Tsuru | JPN | Right | Right | 6' 6" | 215 lbs | - |
| Okano, Yoshida | RF | Tohoku Rakuten Golden Eagles | 21 | 03/13/2013 | Higashiosaka | JPN | Left | Left | 5' 10" | 165 lbs | - |
| Okazaki, Kyotaka | LF | Tohoku Rakuten Golden Eagles | 22 | 12/25/2012 | Sasebo | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Okazaki, Yashiya | 2B | ORIX Buffaloes | 21 | 04/02/2013 | Kawasaki | JPN | Right | Right | 5' 10" | 180 lbs | - |
| Okazaki, Yozo | 1B | Hanshin Tigers | 22 | 09/24/2012 | Amagasaki | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Okita, Hatsuo | RF | Hiroshima Toyo Carp | 19 | 10/25/2015 | Nabari | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Okumura, Yasusaburo | C | Tohoku Rakuten Golden Eagles | 21 | 04/23/2013 | Sugito | JPN | Right | Right | 5' 10" | 185 lbs | - |
| Okura, Tatsuma | RP | ORIX Buffaloes | 21 | 05/03/2013 | Tokyo | JPN | Left | Left | 6' 3" | 185 lbs | - |
| Okuyama, Takuzo | SP | ORIX Buffaloes | 21 | 03/27/2013 | Yamoto | JPN | Left | Left | 6' 2" | 195 lbs | - |
| Oler, Vince | RP | Fukuoka SoftBank Hawks | 18 | 01/01/2016 | Glendale | USA | Right | Right | 6' 3" | 190 lbs | - |
| Olheiser, Ben | RP | Yokohama Bay Stars | 19 | 04/30/2015 | Placid Lakes | USA | Left | Left | 6' 3" | 175 lbs | - |
| Olson, Josh | SP | Hokkaido Nippon-Ham Fighters | 18 | 05/31/2016 | Belvedere | USA | Right | Right | 6' 5" | 200 lbs | - |
| Omori, Moritake | SP | Chunichi Dragons | 19 | 03/27/2015 | Osaka | JPN | Right | Right | 6' 7" | 215 lbs | - |
| Omori, Shoji | SP | Hiroshima Toyo Carp | 20 | 10/26/2014 | Shime | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Omori, Yoneo | RP | Hiroshima Toyo Carp | 22 | 11/16/2012 | Kamogawa | JPN | Right | Right | 5' 11" | 190 lbs | - |
| Omoto, Yusuke | RP | Free Agent | 23 | 03/29/2011 | Tokyo | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Omura, Kohji | RP | Hokkaido Nippon-Ham Fighters | 21 | 03/07/2013 | Koshigaya | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Omura, Yoichibei | SP | Hiroshima Toyo Carp | 22 | 08/31/2012 | Matsusaka | JPN | Left | Left | 6' 0" | 180 lbs | - |
| Onishi, Michio | C | Free Agent | 23 | 11/29/2011 | Kasaoka | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Ono, Chikashi | 3B | Yomiuri Giants | 22 | 08/06/2012 | Tokyo | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Ono, Kenkichi | RP | Yomiuri Giants | 21 | 03/08/2013 | Chiba | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Ono, Shinya | SS | Chunichi Dragons | 21 | 04/11/2013 | Kashiwa | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Ono, Takato | 1B | Chiba Lotte Marines | 21 | 04/10/2013 | Shimizu | JPN | Left | Left | 6' 2" | 220 lbs | - |
| Ono, Teruo | 3B | Hiroshima Toyo Carp | 21 | 06/01/2013 | Akishima | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Ornelas, Tony | RP | Hanshin Tigers | 19 | 03/17/2015 | San Antonio de los Altos | VEN | Right | Right | 6' 2" | 175 lbs | - |
| Osaka, Ryo | SP | Hanshin Tigers | 19 | 02/02/2015 | Shimada | JPN | Right | Right | 5' 11" | 180 lbs | - |
| Osborne, John | 1B | Free Agent | 24 | 12/19/2010 | Baiyin | CHN | Left | Left | 6' 3" | 235 lbs | - |
| Osborne, Noah | RP | Tohoku Rakuten Golden Eagles | 19 | 01/25/2015 | Kiln | USA | Left | Right | 6' 3" | 175 lbs | - |
| Oshima, Hiroto | SP | Tohoku Rakuten Golden Eagles | 22 | 06/10/2012 | Tomiya | JPN | Left | Right | 5' 9" | 165 lbs | - |
| Osugi, Sadaharu | RP | Hokkaido Nippon-Ham Fighters | 22 | 12/09/2012 | Mishima | JPN | Right | Right | 5' 11" | 175 lbs | - |
| Oto, Kazuyoshi | 2B | Free Agent | 23 | 01/06/2011 | Kashiwazaki | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Otsubo, Masayuki | SP | Free Agent | 23 | 02/05/2011 | Kawanishi | JPN | Right | Right | 6' 5" | 210 lbs | - |
| Otsuka, Shuichiro | RP | ORIX Buffaloes | 22 | 08/23/2012 | Nagoya | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Oyama, Sofu | RP | Tohoku Rakuten Golden Eagles | 22 | 06/12/2012 | Takasago | JPN | Left | Right | 5' 11" | 170 lbs | - |
| Ozaki, Hiromitsu | RP | Yokohama Bay Stars | 22 | 07/14/2012 | Kumamoto | JPN | Switch | Right | 6' 1" | 185 lbs | - |
| Ozawa, Yoshimatsu | RF | Free Agent | 23 | 04/04/2011 | Kushiro City | JPN | Right | Right | 6' 0" | 185 lbs | - |
