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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brian, Frank | RF | Dayton Dragons | 18 | 10/11/1991 | Gardendale | USA | Right | Right | 5' 11" | 185 lbs | - |
| Ogawa, Motonobu | C | Great Lakes Loons | 21 | 03/24/1989 | Nishio | JPN | Right | Right | 6' 3" | 225 lbs | - |
| Oliver, George | 2B | Peoria Chiefs | 23 | 02/17/1987 | Terra Mar | USA | Switch | Right | 6' 0" | 190 lbs | - |
| Orr, Randy | CL | South Bend Silver Hawks | 20 | 02/09/1990 | Kendall West | USA | Right | Right | 5' 10" | 210 lbs | - |
| Ortíz, César | RF | Wisconsin Timber Rattlers | 23 | 05/30/1987 | Santiago | DOM | Switch | Right | 6' 1" | 210 lbs | - |
| Otero, José | LF | Kane County Cougars | 26 | 12/16/1983 | Brooklyn | USA | Left | Left | 6' 2" | 225 lbs | - |
| Otero, Rafael | SP | Kane County Cougars | 21 | 12/24/1988 | Ciudad Guayana | VEN | Right | Right | 6' 2" | 205 lbs | - |
| Ow, Hang-fu | CL | Quad Cities River Bandits | 23 | 06/24/1987 | Jiagedagi | CHN | Right | Left | 6' 2" | 195 lbs | - |
| Ozaki, Tsukasa | SP | Kane County Cougars | 21 | 08/13/1989 | Oi | JPN | Right | Right | 6' 2" | 210 lbs | - |
