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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Benny | 1B | Lakeland Flying Tigers | 26 | 05/04/2021 | Racine | USA | Right | Right | 6' 6" | 200 lbs | - |
| O'Donnell, Jonathan | RP | Free Agent | 27 | 02/03/2020 | Farwell | USA | Left | Left | 6' 5" | 200 lbs | - |
| O'Malley, Brandon | CF | Lakeland Flying Tigers | 23 | 09/17/2024 | Fairfax | USA | Right | Left | 6' 1" | 190 lbs | - |
| O'Neal, Justin | 2B | Tampa Yankees | 21 | 12/05/2026 | Murfreesboro | USA | Left | Right | 6' 6" | 200 lbs | - |
| Oake, Ed | 3B | Lake Elsinore Storm | 23 | 06/19/2024 | Laval | CAN | Right | Right | 6' 2" | 200 lbs | - |
| Oakes, Mike | RP | Dunedin Blue Jays | 22 | 07/08/2025 | Brooklyn | USA | Left | Left | 6' 4" | 205 lbs | - |
| Oetker, Terry | 1B | Fort Myers Miracle | 20 | 04/12/2027 | Euless | USA | Right | Right | 6' 5" | 210 lbs | - |
| Ojeda, Manny | RP | Bakersfield Blaze | 19 | 09/18/2028 | Santo Domingo | DOM | Switch | Right | 6' 2" | 190 lbs | - |
| Okimura, Hideo | RF | Bakersfield Blaze | 24 | 11/11/2023 | Iwaki | JPN | Right | Right | 6' 6" | 205 lbs | $675,000 |
| Okuhara, Sumiki | LF | Myrtle Beach Pelicans | 34 | 02/18/2013 | Atsugi | JPN | Left | Left | 6' 1" | 190 lbs | - |
| Olausson, Joel | CL | Bradenton Marauders | 24 | 04/01/2023 | Canton | USA | Right | Right | 6' 1" | 195 lbs | - |
| Olech, Jeff | SP | Carolina Mudcats | 27 | 10/11/2020 | Columbia | USA | Switch | Right | 6' 0" | 175 lbs | - |
| Oliva, Noe | CF | Richmond Flying Squirrels | 19 | 04/25/2028 | San Carlos | NCA | Right | Right | 6' 4" | 195 lbs | - |
| Olivo, Jon | RP | Salem Red Sox | 23 | 07/07/2024 | Coyuca | MEX | Right | Right | 6' 7" | 205 lbs | - |
| Olkowicz, Ernest | LF | Lynchburg Hillcats | 27 | 01/08/2020 | Jesup | USA | Right | Right | 6' 7" | 200 lbs | - |
| Olson, Scott | RP | Dunedin Blue Jays | 23 | 09/12/2024 | Red Bank | USA | Right | Right | 5' 11" | 185 lbs | - |
| Olujimi, Iften | SS | Tampa Yankees | 24 | 07/13/2023 | Cape Town | RSA | Right | Right | 6' 1" | 200 lbs | - |
| Olvera, Hector | RF | Fort Myers Miracle | 21 | 04/08/2026 | Santiago de Cuba | CUB | Left | Left | 6' 2" | 175 lbs | - |
| Olvera, Tony | CF | Potomac Nationals | 17 | 02/02/2030 | Waspan | NCA | Left | Left | 6' 4" | 185 lbs | - |
| Ontiveros, Jose | CF | Dunedin Blue Jays | 25 | 08/29/2022 | San Pedro de Macorís | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Orr, Bryant | RP | Frederick Keys | 23 | 08/09/2024 | Kennewick | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortega, Franklin | 3B | Potomac Nationals | 18 | 05/15/2029 | Havana | CUB | Right | Right | 6' 2" | 195 lbs | - |
| Ortiz, Edgar | 1B | Wilmington Blue Rocks | 20 | 04/06/2027 | Guacara | VEN | Left | Right | 6' 4" | 205 lbs | - |
| Ortiz, Jorge | SP | Lancaster JetHawks | 19 | 11/29/2028 | Dajabón | DOM | Right | Left | 6' 1" | 165 lbs | - |
| Ortiz, Terciero | 1B | Lancaster JetHawks | 19 | 11/24/2028 | Ceres | USA | Switch | Right | 6' 3" | 190 lbs | - |
| Ortiz, Tony | SP | Bradenton Marauders | 23 | 10/15/2024 | La Victoria | VEN | Right | Right | 5' 9" | 180 lbs | - |
| Ott, Butch | SP | Wilmington Blue Rocks | 22 | 05/20/2025 | Suffolk | USA | Left | Left | 6' 4" | 200 lbs | - |
| Oviedo, David | CL | Clearwater Threshers | 20 | 04/02/2027 | Chesterfield | USA | Right | Right | 6' 2" | 200 lbs | - |
