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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Bill | LF | Calgary Kodiaks | 26 | 02/23/2008 | New York | USA | Right | Left | 6' 3" | 210 lbs | - |
| O'Dell, Greg | SP | Canton Paczkis | 30 | 01/31/2004 | Baytown | USA | Right | Right | 6' 1" | 195 lbs | - |
| Oakley, Maurice | SP | Bronx Bombers | 27 | 02/02/2007 | Mt. Isa | AUS | Right | Right | 6' 2" | 200 lbs | - |
| Ochoa, Ignacio | 3B | Vancouver Canadians | 24 | 10/05/2010 | Naucalpan | MEX | Right | Right | 6' 2" | 200 lbs | $550,000 |
| Ochoa, Julio | SP | Bronx Bombers | 24 | 06/15/2010 | Cambridge | USA | Right | Right | 6' 0" | 170 lbs | - |
| Ogawa, Haruhiko | C | Free Agent | 24 | 04/01/2010 | Nagasaki | JPN | Right | Right | 5' 10" | 190 lbs | - |
| Ogawa, Takeji | SP | Antioch Coal Miners | 34 | 11/04/2000 | Himeji | JPN | Right | Right | 6' 2" | 230 lbs | - |
| Ohayashi, Kagetoki | SP | Espanola Bomberos | 27 | 02/15/2007 | Ichihara | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Ohayashi, Subaru | RP | Billings Mustangs | 26 | 02/01/2008 | Akishima | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Ohayashi, Taheiji | RP | Free Agent | 26 | 05/04/2008 | Izumi | JPN | Left | Right | 6' 1" | 195 lbs | - |
| Okimura, Hiroo | CL | Joplin Fireballs | 22 | 04/04/2012 | Nandan | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Okubo, Hisato | RP | Free Agent | 30 | 12/25/2004 | Gojo | JPN | Right | Right | 6' 5" | 225 lbs | - |
| Okuda, Tameyoshi | RF | Vancouver Canadians | 27 | 02/27/2007 | Obihiro | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Okuta, Munoto | RF | Albuquerque Cacti | 25 | 04/26/2009 | Yokohama | JPN | Right | Right | 6' 4" | 215 lbs | - |
| Oliveira, Esteban | SS | Omaha Raptors | 25 | 07/26/2009 | Unknown | PUR | Left | Right | 6' 0" | 180 lbs | - |
| Olivo, Jorge | SP | Minneapolis Freeze | 24 | 01/03/2010 | Unknown | MEX | Right | Right | 6' 3" | 210 lbs | - |
| Onishi, Fomio | C | Silver Lake Baristas | 25 | 08/18/2009 | Shiga | JPN | Right | Right | 6' 3" | 220 lbs | - |
| Onishi, Mitsuharu | 1B | Free Agent | 25 | 05/10/2009 | Unknown | JPN | Right | Right | 6' 2" | 230 lbs | - |
| Onkwani, Lemn | 1B | Free Agent | 29 | 10/13/2005 | Johannesburg | RSA | Right | Right | 6' 2" | 225 lbs | - |
| Orozco, Héctor | CF | Silver Lake Baristas | 25 | 08/16/2009 | Unknown | PUR | Right | Right | 6' 1" | 195 lbs | - |
| Ortega, Alejandro | SP | Antioch Coal Miners | 26 | 08/30/2008 | Santo Domingo | CUB | Right | Right | 6' 3" | 225 lbs | $2,000,000 |
| Ortega, Carlos | 3B | Free Agent | 28 | 01/01/2006 | Archbold | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortega, Vicente | 2B | Fairfield Flash | 25 | 11/19/2009 | Unknown | MEX | Right | Right | 6' 0" | 185 lbs | - |
| Ortíz, Jesús | 1B | Canton Paczkis | 25 | 04/27/2009 | Maturín | VEN | Switch | Right | 6' 5" | 210 lbs | $550,000 |
| Ortíz, Marcos | LF | Omaha Raptors | 29 | 12/18/2005 | Chicago | USA | Right | Right | 6' 0" | 235 lbs | - |
| Osewe, Ayan | RP | Chicago Titans | 31 | 09/08/2003 | Abidjan | CIV | Right | Right | 6' 0" | 190 lbs | - |
| Osler, Joe | RF | Free Agent | 32 | 01/16/2002 | London | ENG | Right | Right | 6' 2" | 215 lbs | - |
| Ota, Goro | SP | Canton Paczkis | 27 | 04/06/2007 | Unknown | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Otsuka, Kunio | SP | Joplin Fireballs | 23 | 09/06/2011 | Wakayama | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Outlaw, Terry | SP | Espanola Bomberos | 25 | 07/06/2009 | Casas Adobes | USA | Left | Left | 6' 1" | 180 lbs | - |
| Owen, Kent | C | Joplin Fireballs | 26 | 10/02/2008 | Manteca | USA | Right | Right | 6' 0" | 210 lbs | - |
| Owens, Jody | SS | Joplin Fireballs | 22 | 02/27/2012 | Chicago | USA | Left | Right | 6' 1" | 190 lbs | - |
