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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Joey | RF | Oklahoma City Dodgers | 20 | 11/28/1997 | Okinawa | JPN | Right | Right | 6' 2" | 215 lbs | - |
| O'Brien, Peter | 1B | Las Vegas 51s | 28 | 07/15/1990 | Miami Gardens | USA | Right | Right | 6' 3" | 235 lbs | - |
| O'Hearn, Ryan | 1B | Louisville Bats | 25 | 07/26/1993 | Frisco | USA | Left | Left | 6' 3" | 200 lbs | - |
| O'Keefe, Brian | C | Buffalo Bisons | 25 | 07/15/1993 | Albany | USA | Right | Right | 6' 0" | 210 lbs | - |
| O'Neil, Conner | RP | Nashville Sounds | 24 | 09/25/1994 | Unknown | USA | Right | Right | 6' 2" | 195 lbs | - |
| O'Neill, Michael | LF | Reno Aces | 26 | 06/12/1992 | Powell | USA | Right | Right | 6' 0" | 195 lbs | $545,000 |
| O'Reilly, Mike | SP | Indianapolis Indians | 24 | 09/03/1994 | Wading River | USA | Right | Right | 5' 10" | 180 lbs | - |
| Ohanian, Sarkis | RP | Indianapolis Indians | 25 | 08/06/1993 | Boynton Beach | USA | Right | Right | 5' 10" | 195 lbs | - |
| Olson, JB | RP | Salt Lake Bees | 23 | 02/15/1995 | Shady Shores | USA | Right | Right | 6' 2" | 195 lbs | - |
| Olson, Tyler | RP | Scranton WB RailRiders | 29 | 10/02/1989 | Spokane | USA | Right | Left | 6' 3" | 195 lbs | $545,000 |
| Orf, Nate | 2B | Columbus Clippers | 28 | 02/01/1990 | Wentzville | USA | Right | Right | 5' 8" | 180 lbs | - |
| Orlando, Paulo | RF | Colorado Springs Sky Sox | 33 | 11/01/1985 | São Paulo | BRA | Right | Right | 6' 2" | 215 lbs | $558,250 |
| Ortiz, Luis | SP | Memphis Redbirds | 23 | 09/22/1995 | Sanger | USA | Right | Right | 6' 3" | 230 lbs | $545,000 |
| Oswalt, Corey | SP | Free Agent | 25 | 09/03/1993 | San Diego | USA | Right | Right | 6' 5" | 250 lbs | - |
| Outman, James | RF | Buffalo Bisons | 21 | 05/14/1997 | Redwood City | USA | Left | Right | 6' 2" | 195 lbs | - |
