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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Joe | SS | Chattanooga Lookouts | 30 | 02/07/1980 | Lake Ridge | USA | Right | Right | 5' 8" | 177 lbs | - |
| Ohayashi, Tsuramatsu | SP | Chattanooga Lookouts | 23 | 01/19/1987 | Sakaide | JPN | Left | Left | 6' 7" | 225 lbs | - |
| Ojima, Hirohisa | MR | Tennessee Smokies | 29 | 04/22/1981 | Komae | JPN | Switch | Right | 6' 2" | 220 lbs | - |
| Okamoto, Toin | RF | Birmingham Barons | 22 | 11/17/1987 | Hiroshima | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Oporta, David | SP | Montgomery Biscuits | 21 | 04/03/1989 | Grapevine | USA | Left | Right | 6' 1" | 185 lbs | - |
| Ouellette, Fred | 1B | Montgomery Biscuits | 23 | 04/02/1987 | Winnipeg | CAN | Right | Right | 6' 3" | 240 lbs | - |
| Owens, John | 3B | Chattanooga Lookouts | 26 | 06/15/1984 | Riverdale | USA | Left | Right | 6' 3" | 205 lbs | - |
| Oyama, Naoki | LF | Mississippi Braves | 22 | 02/22/1988 | Matsumoto | JPN | Right | Right | 6' 3" | 185 lbs | - |
