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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ogasahara, Satoru | RP | Machida Dustdevils | 30 | 04/10/2004 | Taiwa | JPN | Right | Right | 6' 1" | 250 lbs | $102,000 |
| Ogawa, Hiroyasu | CF | Matsuyama Miracle | 19 | 05/23/2015 | Mitsukaido | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Ogawa, Katsumi | SP | Okazaki Tornado | 25 | 10/21/2009 | Kawasaki | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Ogawa, Misao | 1B | Free Agent | 27 | 02/05/2007 | Kamagaya | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Ohara, Takuro | C | Okazaki Tornado | 23 | 11/07/2011 | Fukuoka | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Ohayashi, Hiroya | SS | Sendai Hopes | 31 | 12/09/2003 | Miyoshi | JPN | Right | Right | 5' 10" | 195 lbs | $494,000 |
| Ohayashi, Katsunosuki | RP | Sendai Hopes | 20 | 12/20/2014 | Kasukabe | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Ohayashi, Kazuki | RP | Fukuyama Norsemen | 27 | 05/20/2007 | Kashiwa | JPN | Right | Right | 6' 0" | 210 lbs | $230,000 |
| Ohayashi, Kiichi | C | Free Agent | 19 | 11/20/2015 | Hiroshima | JPN | Right | Right | 5' 10" | 185 lbs | - |
| Ohayashi, Kikaku | SP | Free Agent | 21 | 06/21/2013 | Kumamoto | JPN | Left | Left | 6' 2" | 200 lbs | - |
| Ohayashi, Mototsune | SS | Okazaki Tornado | 33 | 01/07/2002 | Nago | JPN | Switch | Right | 6' 3" | 230 lbs | - |
| Ohayashi, Takayuki | RP | Okazaki Tornado | 22 | 10/02/2012 | Osaka | JPN | Left | Right | 5' 10" | 185 lbs | - |
| Oike, Tsuramatsu | SP | Kobe Speeders | 24 | 01/11/2011 | Nakano | JPN | Left | Right | 5' 11" | 185 lbs | - |
| Ojima, Hideaki | CF | Sendai Hopes | 25 | 08/15/2009 | Hachioji | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Ojima, Kanzaburo | RP | Sendai Hopes | 26 | 08/27/2008 | Kyoto | JPN | Right | Right | 5' 11" | 210 lbs | - |
| Ojima, Katai | RP | Machida Dustdevils | 25 | 02/24/2009 | Matsudo | JPN | Switch | Right | 6' 1" | 205 lbs | - |
| Ojima, Muneyaki | CF | Okazaki Tornado | 28 | 12/31/2006 | Sakai | JPN | Switch | Right | 5' 10" | 185 lbs | - |
| Ojima, Razan | 1B | Niigata Cardinals | 22 | 06/17/2012 | Wako | JPN | Left | Left | 6' 0" | 195 lbs | $50,000 |
| Ojima, Tsugumichi | RP | Free Agent | 36 | 12/28/1998 | Fukuoka | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Okabe, Senzo | 1B | Kobe Speeders | 27 | 07/23/2007 | Ikeda | JPN | Right | Right | 6' 5" | 250 lbs | $510,000 |
| Okada, Oda | LF | Sendai Hopes | 24 | 08/24/2010 | Ichinomiya | JPN | Left | Left | 6' 1" | 190 lbs | $498,000 |
| Okada, Okakura | 1B | Sendai Hopes | 31 | 12/06/2003 | Izumi | JPN | Left | Left | 6' 4" | 215 lbs | $1,302,000 |
| Okamoto, Soshu | SP | Fukuyama Norsemen | 27 | 06/05/2007 | Neyagawa | JPN | Left | Left | 6' 3" | 210 lbs | $99,000 |
| Okamoto, Tokutomi | CF | Fukuyama Norsemen | 29 | 11/27/2005 | Takasago | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Okubo, Yuki | SS | Kobe Speeders | 21 | 05/02/2013 | Kasugai | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Okumura, Katsunan | RP | Matsuyama Miracle | 32 | 11/23/2002 | Higashiosaka | JPN | Left | Left | 5' 9" | 220 lbs | $326,000 |
| Oliva, Alfonso | 3B | Okazaki Tornado | 20 | 06/16/2014 | Punta Cardón | VEN | Right | Right | 6' 1" | 190 lbs | - |
| Olvera, Ángelo | SP | Sendai Hopes | 17 | 09/27/2017 | San Cristóbal | DOM | Right | Right | 6' 0" | 165 lbs | - |
| Onishi, Akihito | RP | Okazaki Tornado | 21 | 07/06/2013 | Fuchu | JPN | Right | Right | 6' 3" | 210 lbs | - |
| Onishi, Narihari | 1B | Matsuyama Miracle | 24 | 07/03/2010 | Tokyo | JPN | Left | Left | 6' 2" | 220 lbs | $50,000 |
| Ono, Katsumi | RP | Free Agent | 28 | 11/12/2006 | Sukumo | JPN | Left | Right | 6' 4" | 220 lbs | - |
| Ono, Nobuhiko | RP | Fukuyama Norsemen | 26 | 01/19/2008 | Hasuda | JPN | Right | Right | 6' 1" | 200 lbs | $50,000 |
| Ono, Noburo | SP | Matsuyama Miracle | 34 | 02/23/2000 | Yokohama | JPN | Right | Right | 5' 9" | 210 lbs | $338,000 |
| Ono, Soetsu | CF | Sendai Hopes | 28 | 04/30/2006 | Kofu | JPN | Right | Right | 6' 4" | 210 lbs | $88,000 |
| Ono, Tetsuzan | 3B | Fukuyama Norsemen | 26 | 09/20/2008 | Nihommatsu | JPN | Right | Right | 6' 0" | 210 lbs | $104,000 |
| Ontiveros, Jack | RF | Fukuyama Norsemen | 24 | 11/20/2010 | Maunabo | PUR | Left | Left | 6' 5" | 225 lbs | - |
| Ontiveros, Luis | 3B | Matsuyama Miracle | 22 | 12/08/2012 | Irapuato | MEX | Left | Right | 6' 0" | 175 lbs | - |
| Ornelza, Gilberto | SP | Fukuyama Norsemen | 22 | 03/28/2012 | Trujillo Alto | PUR | Right | Right | 6' 4" | 195 lbs | - |
| Orosco, Pedro | SP | Okazaki Tornado | 18 | 07/29/2016 | San Juan | PUR | Right | Right | 6' 0" | 170 lbs | - |
| Osada, Teika | CF | Fukuyama Norsemen | 31 | 04/11/2003 | Yoichi | JPN | Left | Left | 6' 2" | 230 lbs | - |
| Osawa, Takashi | 1B | Sendai Hopes | 30 | 10/10/2004 | Setaka | JPN | Right | Right | 6' 2" | 270 lbs | $80,000 |
| Oshima, Jun | RF | Okazaki Tornado | 19 | 07/03/2015 | Fujinomiya | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Ota, Masutaro | CF | Niigata Cardinals | 20 | 04/25/2014 | Himeji | JPN | Left | Left | 6' 3" | 200 lbs | - |
| Ota, Shozo | SS | Kobe Speeders | 22 | 03/31/2012 | Wakayama | JPN | Right | Right | 5' 8" | 170 lbs | - |
| Otani, Kinji | 3B | Sendai Hopes | 30 | 02/21/2004 | Miharu | JPN | Left | Right | 6' 2" | 235 lbs | $89,000 |
| Otani, Masanobu | CF | Machida Dustdevils | 29 | 08/01/2005 | Wakayama | JPN | Right | Right | 6' 4" | 230 lbs | - |
| Otani, Seiichi | RP | Niigata Cardinals | 32 | 06/01/2002 | Nagaoka | JPN | Switch | Right | 6' 2" | 235 lbs | $104,000 |
| Otsuka, Masahiro | RP | Sendai Hopes | 22 | 08/10/2012 | Shimosuwa | JPN | Left | Left | 5' 10" | 180 lbs | $110,000 |
| Oyama, Tatsukichi | SS | Niigata Cardinals | 27 | 01/03/2008 | Ibaraki | JPN | Right | Right | 5' 9" | 190 lbs | $50,000 |
| Oyama, Yoshiteru | SP | Kobe Speeders | 27 | 10/19/2007 | Sagamihara | JPN | Right | Right | 6' 1" | 205 lbs | $154,000 |
