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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Halloran, Bill | C | Ellenburg Fighting Dachsunds | 30 | 07/21/2012 | Raleigh | USA | Left | Right | 6' 1" | 240 lbs | - |
| O'Neal, Lawrence | 1B | Milton Dogfish Head | 28 | 08/09/2014 | Bensenville | USA | Right | Right | 6' 2" | 220 lbs | - |
| O'Neal, Tim | LF | Sioux Falls Red Pandas | 35 | 09/10/2007 | Kansas City | USA | Left | Left | 6' 3" | 220 lbs | - |
| O'Neill, Mike | SS | Austin Black Mambas | 29 | 12/20/2013 | San Diego | USA | Right | Right | 6' 4" | 225 lbs | - |
| O'Reilly, John | RP | Calgary Lynx | 26 | 04/09/2016 | Ft. Worth | USA | Right | Right | 6' 1" | 200 lbs | - |
| Oliva, Richello | 3B | Monongahela Monsters | 29 | 06/19/2013 | Manila | PHI | Right | Right | 6' 0" | 205 lbs | - |
| Olsen, Fred | SP | Calgary Lynx | 24 | 12/31/2018 | Winnsboro | USA | Right | Right | 6' 4" | 220 lbs | - |
| Opsteegh, Falco | RF | Salt Lake City Buzz | 28 | 06/30/2014 | Willemstad | CUR | Right | Right | 6' 0" | 205 lbs | - |
| Orlovsky, Sasha | CF | Pennsauken Flyers | 28 | 06/29/2014 | Sulphur | USA | Right | Right | 6' 2" | 210 lbs | - |
| Oropeza, Luis | RP | Free Agent | 33 | 04/03/2009 | Santa Ana | SLV | Left | Left | 6' 1" | 190 lbs | - |
| Osborne, Francis | C | Nolensville Knights | 32 | 10/21/2010 | Spanish Town | JAM | Right | Right | 6' 4" | 250 lbs | - |
| Ota, Tsugahara | RP | Santa Barbara Golden Cranes | 27 | 11/28/2015 | Hirakata | JPN | Right | Right | 6' 7" | 230 lbs | - |
