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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Fennaghty, Steve | RP | Port Huron Blitzkrieg | 29 | 02/22/2014 | Ft. Campbell North | USA | Right | Left | 6' 3" | 235 lbs | - |
| O'Halloran, Bill | C | Ellenburg Fighting Dachsunds | 31 | 07/21/2012 | Raleigh | USA | Left | Right | 6' 1" | 240 lbs | - |
| O'Neal, Lawrence | 1B | Milton Dogfish Head | 29 | 08/09/2014 | Bensenville | USA | Right | Right | 6' 2" | 220 lbs | - |
| O'Reilly, John | RP | Calgary Lynx | 27 | 04/09/2016 | Ft. Worth | USA | Right | Right | 6' 1" | 200 lbs | - |
| Ogawa, Torajiro | CF | Vermont Lake Monsters | 29 | 07/13/2014 | Utsunomiya | JPN | Right | Right | 6' 4" | 225 lbs | - |
| Okel, Gavin | CF | Salt Lake City Buzz | 23 | 12/25/2020 | San Ignacio | BLZ | Switch | Right | 6' 3" | 190 lbs | - |
| Oliwa, Ainanani | RP | Calgary Lynx | 31 | 01/23/2012 | Nuuuli | ASA | Right | Right | 5' 10" | 185 lbs | $445,000 |
| Ortega, Claudio | RP | Milton Dogfish Head | 22 | 04/23/2021 | La Descubierta | DOM | Right | Right | 6' 1" | 180 lbs | - |
| Ortíz, Francisco | SS | Austin Black Mambas | 28 | 11/25/2015 | Batan | CRC | Right | Right | 6' 2" | 200 lbs | - |
| Osborne, Francis | C | Nolensville Knights | 33 | 10/21/2010 | Spanish Town | JAM | Right | Right | 6' 4" | 250 lbs | - |
| Ota, Tsugahara | RP | Santa Barbara Golden Cranes | 28 | 11/28/2015 | Hirakata | JPN | Right | Right | 6' 7" | 225 lbs | - |
| Otani, Shohei | 1B | Free Agent | 32 | 01/16/2011 | Iwate | JPN | Left | Left | 6' 0" | 195 lbs | - |
| Overdevest, Conrad | RF | Vermont Lake Monsters | 22 | 05/14/2021 | Willemstad | CUR | Left | Left | 6' 1" | 190 lbs | - |
