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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Colin | C | Oakland Oaks | 18 | 12/14/2008 | Dublin | IRL | Right | Right | 6' 1" | 185 lbs | - |
| Ohara, Munemori | 2B | Northern Virginia Retrievers | 28 | 12/16/1998 | Matsudo | JPN | Left | Right | 6' 3" | 215 lbs | $5,390,000 |
| Ohayashi, Shigenobu | CF | Chicago Gold Sox | 17 | 06/07/2009 | Kamakura | JPN | Left | Left | 5' 10" | 160 lbs | - |
| Okonjo, Idowu | SP | Portland Evergreens | 18 | 06/25/2008 | Windhoek | NAM | Right | Right | 6' 1" | 175 lbs | - |
| Ornelas, Francisco | LF | Northern Virginia Retrievers | 26 | 07/19/2000 | Santiago | DOM | Left | Left | 6' 0" | 200 lbs | $880,000 |
| Ortíz, Juan | 1B | Houston 1837 BBC | 17 | 09/21/2009 | Mexico City | MEX | Right | Right | 6' 2" | 190 lbs | - |
| Ortíz, Pedro | SP | Buckhead Bowties | 28 | 09/10/1998 | Cumana | VEN | Left | Left | 6' 6" | 205 lbs | $2,050,000 |
| Ortíz, Ximena | CF | Houston 1837 BBC | 17 | 08/18/2009 | Trujillo | VEN | Right | Right | 6' 1" | 175 lbs | - |
| Osterman, Jon | CF | New Amsterdam Republics | 19 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 165 lbs | - |
| Oulton, Everton | RF | Houston 1837 BBC | 18 | 02/23/2008 | Bradford | ENG | Right | Right | 6' 2" | 190 lbs | - |
