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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Farrell, Chris | 1B | Louisville Rockets | 33 | 08/14/1985 | Phoenix | USA | Right | Right | 6' 1" | 206 lbs | - |
| O'Sullivan, Chris | RF | Free Agent | 25 | 09/07/1993 | Snyder | USA | Left | Left | 6' 5" | 220 lbs | - |
| Odhiambo, Ndungu | MR | Athens Assassins | 29 | 04/16/1989 | Accra | GHA | Right | Right | 5' 10" | 230 lbs | - |
| Oglethorpe, Mitchell | 1B | Myrtle Beach Waves | 20 | 11/26/1998 | Plattsburg | USA | Left | Left | 6' 4" | 225 lbs | - |
| Ohashi, Yasushi | SP | Free Agent | 24 | 10/14/1994 | Kobe | JPN | Right | Right | 5' 8" | 205 lbs | - |
| Olson, Mark | MR | Free Agent | 24 | 10/10/1994 | South Miami Heights | USA | Left | Right | 6' 9" | 190 lbs | - |
| Ornelas, Sergio | SP | Free Agent | 24 | 02/11/1994 | Oklahoma City | USA | Switch | Right | 6' 0" | 225 lbs | - |
| Ortíz, Alejandro | C | Free Agent | 31 | 12/15/1987 | Cali | COL | Switch | Right | 6' 2" | 225 lbs | - |
| Ortíz, António | MR | Dunedin Blue Jays | 33 | 12/09/1985 | Matamoros | MEX | Right | Left | 6' 2" | 209 lbs | - |
| Ortíz, Domingo | CL | Myrtle Beach Waves | 23 | 12/30/1995 | Miami | USA | Switch | Right | 6' 1" | 210 lbs | - |
| Ortíz, Manny | C | Louisville Rockets | 24 | 07/08/1994 | Canyon Lake | USA | Left | Right | 6' 0" | 215 lbs | - |
| Ortíz, Roberto | MR | Free Agent | 23 | 08/07/1995 | Jeffersontown | USA | Right | Right | 6' 4" | 230 lbs | - |
