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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Dave | MR | Free Agent | 19 | 05/13/1991 | Gainesville | USA | Right | Left | 6' 1" | 190 lbs | - |
| O'Neal, Wade | CF | Orem Owlz | 22 | 01/08/1988 | San Diego | USA | Switch | Right | 6' 1" | 170 lbs | - |
| Ohayashi, Suezo | MR | Casper Ghosts | 22 | 01/07/1988 | Kitakyushu | JPN | Left | Right | 6' 3" | 220 lbs | - |
| Oike, Shigetoki | MR | Free Agent | 18 | 11/03/1991 | Omura | JPN | Left | Left | 6' 2" | 215 lbs | - |
| Olivencio, Vicente | 2B | Missoula Osprey | 23 | 11/20/1986 | Desemparados | CRC | Right | Right | 6' 0" | 195 lbs | - |
| Ortíz, Víctor | MR | Great Falls Voyagers | 21 | 09/08/1988 | Havana | CUB | Right | Right | 6' 0" | 210 lbs | - |
