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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Bobby | SP | Vancouver Canadians | 38 | 12/25/2011 | Colorado Springs | USA | Right | Right | 6' 0" | 200 lbs | - |
| O'Connor, Austin | SP | Lowell Spinners | 23 | 11/12/2026 | Anaheim | USA | Right | Right | 6' 4" | 200 lbs | - |
| O'Connor, Jared | 3B | Hillsboro Hops | 27 | 07/23/2022 | Toledo | USA | Switch | Right | 6' 0" | 195 lbs | - |
| O'Hare, Adam | LF | Vancouver Canadians | 30 | 01/11/2019 | Fairview Park | USA | Right | Right | 6' 0" | 195 lbs | - |
| Obote, Areda | SS | Los Angeles (NYP) Dodgers | 26 | 11/22/2023 | Khorixas | NAM | Right | Right | 6' 0" | 200 lbs | - |
| Ogasawara, Ryuki | SS | Free Agent | 35 | 09/14/2014 | Yokohama | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Ogilvie, Jamie | 3B | Vancouver Canadians | 38 | 01/01/2011 | New York | USA | Right | Right | 6' 1" | 200 lbs | - |
| Okuhara, Sumiki | RF | Free Agent | 36 | 02/18/2013 | Atsugi | JPN | Left | Left | 6' 1" | 195 lbs | - |
| Olausson, Joel | RP | Free Agent | 26 | 04/01/2023 | Canton | USA | Right | Right | 6' 1" | 205 lbs | - |
| Olivares, C.J. | LF | Milwaukee (NYP) Brewers | 24 | 01/22/2025 | Brooklyn | USA | Switch | Right | 6' 2" | 205 lbs | - |
| Olivo, Jon | RP | Lowell Spinners | 25 | 07/07/2024 | Coyuca | MEX | Right | Right | 6' 7" | 200 lbs | - |
| Ontiveros, Melvin | SP | Idaho Falls Chukars | 21 | 02/17/2028 | Kissimmee | USA | Left | Left | 6' 1" | 190 lbs | - |
| Orosco, Adrian | 1B | Idaho Falls Chukars | 25 | 03/12/2024 | Madera Acres | USA | Switch | Left | 6' 2" | 200 lbs | - |
| Orozco, Victor | 3B | Lowell Spinners | 30 | 10/01/2019 | Santo Domingo | DOM | Right | Right | 6' 3" | 200 lbs | - |
| Ortega, Cesar | 3B | Tri-City Dust Devils | 30 | 08/18/2019 | Cotuí | DOM | Right | Right | 6' 0" | 175 lbs | - |
| Ortiz, Bill | 1B | Mahoning Valley Scrappers | 23 | 10/02/2026 | Santo Domingo | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Ortiz, Jon | RP | Milwaukee (NYP) Brewers | 22 | 03/19/2027 | Gatún | PAN | Left | Left | 6' 5" | 200 lbs | - |
| Ostrowski, Cy | 1B | Salem-Keizer Volcanoes | 29 | 12/08/2020 | Elkhart | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ott, Dan | RP | Free Agent | 26 | 03/02/2023 | Zillah | USA | Switch | Left | 6' 0" | 190 lbs | - |
| Owens, Brian | SP | Idaho Falls Chukars | 20 | 06/11/2029 | Arden-on-the-Severn | USA | Right | Right | 6' 0" | 180 lbs | - |
| Ozuna, Nelson | RF | Free Agent | 33 | 08/21/2016 | San Cristóbal | DOM | Right | Right | 6' 1" | 200 lbs | - |
