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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Jeff | RP | West Virginia Power | 28 | 07/09/2010 | Deer Lodge | USA | Right | Right | 5' 11" | 210 lbs | - |
| O'Monahan, Travis | C | Oklahoma City Owls | 24 | 01/18/2015 | Oswego | USA | Right | Right | 6' 4" | 205 lbs | - |
| O'Neil, Brian | RP | Alexandria Aces | 24 | 06/20/2014 | Ormond Beach | USA | Left | Left | 6' 2" | 190 lbs | - |
| O'Savage, John | 1B | Gainesville Guidos | 25 | 04/09/2013 | New York | USA | Right | Right | 6' 2" | 215 lbs | - |
| O'Toole, Greg | SP | West Virginia Power | 21 | 06/26/2017 | Redondo Beach | USA | Right | Right | 6' 2" | 180 lbs | - |
| Ocampo, Rubén | RP | Oklahoma City Owls | 26 | 10/18/2012 | Mercedes | USA | Right | Right | 5' 11" | 185 lbs | - |
| Oliver, Eric | RP | Oakland Sea Dogs | 20 | 10/24/2018 | New York | USA | Right | Right | 6' 2" | 185 lbs | - |
| Olvera, Santiago | SP | West Virginia Power | 23 | 01/16/2016 | Maturín | VEN | Left | Left | 5' 11" | 165 lbs | $400,000 |
| Ontiveros, Francisco | SP | Key West Barracudas | 25 | 01/14/2014 | Severna Park | USA | Switch | Right | 6' 3" | 205 lbs | $400,000 |
| Ortega, Carlos | RP | West Virginia Power | 22 | 05/14/2016 | Millville | USA | Right | Right | 6' 3" | 185 lbs | - |
| Ortíz, Iván | SP | San Antonio Suns | 25 | 06/18/2013 | La Puerta | USA | Right | Right | 6' 0" | 190 lbs | - |
