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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Feeny, Douglas | 3B | Greensboro Grasshoppers | 31 | 04/28/1979 | Tulsa | USA | Right | Right | 6' 0" | 195 lbs | - |
| Ogawa, Sumitomo | MR | Lexington Legends | 26 | 03/08/1984 | Nishinasuno | JPN | Switch | Right | 6' 5" | 217 lbs | - |
| Olsen, William | MR | West Virginia Power | 20 | 07/09/1990 | Cincinnati | USA | Right | Right | 5' 9" | 205 lbs | - |
| Orozco, Héctor | SP | Hickory Crawdads | 19 | 01/23/1991 | Portola Valley | USA | Right | Right | 6' 7" | 220 lbs | - |
| Orr, Jon | RF | Rome Braves | 24 | 01/19/1986 | Chicago | USA | Left | Left | 6' 2" | 180 lbs | - |
| Ortíz, Carlos | LF | Rome Braves | 23 | 04/02/1987 | Crowley | USA | Left | Left | 6' 3" | 220 lbs | - |
| Osborne, Mike | 2B | Greenville Drive | 25 | 06/02/1985 | New York | USA | Right | Right | 5' 11" | 185 lbs | - |
| Owens, Matt | 1B | Charleston RiverDogs | 31 | 07/31/1979 | Glendale | USA | Right | Right | 6' 4" | 217 lbs | - |
