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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Leary, Doug | 3B | Frisco Rams | 24 | 01/01/2010 | Laval | CAN | Left | Right | 6' 1" | 225 lbs | - |
| O'Reilly, Matt | 3B | Riverside Red Bulls | 26 | 12/11/2008 | Rosenberg | USA | Right | Right | 6' 1" | 205 lbs | - |
| Ochoa, Domingo | RF | Free Agent | 30 | 07/07/2004 | Santa Teresa | VEN | Right | Right | 6' 4" | 250 lbs | - |
| Ohayashi, Hidehira | C | Riverside Red Bulls | 28 | 08/29/2006 | Niigata | JPN | Right | Right | 6' 4" | 215 lbs | - |
| Ohng, Seung-min | CL | Madison Beehive | 22 | 03/17/2012 | Icheon | KOR | Right | Right | 6' 3" | 200 lbs | - |
| Ohnuki, Kyousuke | 3B | Marysville Monarchs | 23 | 09/24/2011 | Hamamatsu | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Ojima, Mitsukuni | LF | Youngstown Tune-Ups | 27 | 08/12/2007 | Matsubara | JPN | Left | Left | 5' 10" | 185 lbs | - |
| Okada, Naoki | RP | Free Agent | 25 | 01/11/2009 | Okinawa | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Okada, Sakutaro | RF | Free Agent | 28 | 11/29/2006 | Matsumoto | JPN | Right | Right | 6' 3" | 235 lbs | - |
| Okawa, Yasujiro | RF | Free Agent | 27 | 08/07/2007 | Unknown | JPN | Left | Left | 6' 5" | 220 lbs | - |
| Okazawaya, Taroemon | RP | Free Agent | 27 | 04/24/2007 | Nagasaki | JPN | Left | Left | 5' 10" | 195 lbs | - |
| Oki, Takamasa | CL | Long Island Ducks | 23 | 03/30/2011 | Nagano | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Okumura, Motonobu | RP | Free Agent | 27 | 12/25/2007 | Nagoya | JPN | Left | Left | 6' 0" | 195 lbs | - |
| Ono, Tetsuzan | SP | Jacksonville Hellcats | 26 | 03/18/2008 | Naha | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Oosterman, Shalom | RF | Youngstown Tune-Ups | 24 | 08/08/2010 | Unknown | ARU | Right | Right | 6' 1" | 185 lbs | - |
| Ordóńez, Jesús | RP | Boise Hawks | 23 | 03/01/2011 | Unknown | CUB | Left | Right | 6' 0" | 185 lbs | - |
| Organ, Stuart | RP | Long Island Ducks | 26 | 05/23/2008 | Southampton | ENG | Right | Right | 6' 6" | 225 lbs | - |
| Orosco, Orlando | 3B | Free Agent | 25 | 08/11/2009 | Unknown | NCA | Switch | Right | 6' 0" | 185 lbs | - |
| Ortega, Lorenzo | CL | San Antonio Storm Troopers | 31 | 01/12/2003 | Unknown | MEX | Switch | Right | 6' 1" | 200 lbs | - |
| Ortiz, Elias | SP | Boise Hawks | 22 | 06/28/2012 | San José | CRC | Left | Left | 6' 2" | 190 lbs | - |
| Ortiz, Juan | SP | Jacksonville Hellcats | 23 | 11/09/2011 | Greeley | USA | Right | Right | 6' 2" | 195 lbs | - |
| Ortíz, Juan | RP | Youngstown Tune-Ups | 25 | 09/21/2009 | Unknown | PAN | Left | Right | 6' 0" | 170 lbs | - |
| Osborn, Curt | SP | Spokane Bulldogs | 22 | 05/06/2012 | Davis | USA | Right | Right | 6' 1" | 200 lbs | - |
| Oster, T.J. | CF | Spokane Bulldogs | 22 | 04/07/2012 | Newport | USA | Right | Right | 6' 3" | 205 lbs | - |
| Owen, Rich | RP | San Antonio Storm Troopers | 23 | 08/25/2011 | Mountain Home | USA | Right | Right | 5' 10" | 170 lbs | - |
| Oxinos, Sofronio | 3B | Free Agent | 29 | 07/11/2005 | Chicago | USA | Right | Right | 6' 0" | 195 lbs | - |
