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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Aaron | SP | Modesto Nuts | 19 | 10/24/2029 | Tamalpais-Homestead Valley | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Brien, Keith | RP | Winston-Salem Dash | 20 | 11/16/2028 | Rowlett | USA | Left | Left | 6' 2" | 190 lbs | - |
| O'Connor, Austin | SP | Salem Red Sox | 22 | 11/12/2026 | Anaheim | USA | Right | Right | 6' 4" | 200 lbs | - |
| O'Connor, Troy | SP | Winston-Salem Dash | 20 | 01/13/2028 | Sydney | AUS | Right | Right | 6' 2" | 175 lbs | - |
| O'Donnell, Jonathan | RP | Free Agent | 28 | 02/03/2020 | Farwell | USA | Left | Left | 6' 5" | 200 lbs | - |
| O'Dwyer, Jim | 1B | Tampa Yankees | 19 | 09/29/2029 | Montreal | CAN | Right | Right | 6' 5" | 215 lbs | - |
| O'Neal, Justin | 2B | Tampa Yankees | 22 | 12/05/2026 | Murfreesboro | USA | Left | Right | 6' 6" | 200 lbs | - |
| Oake, Ed | 3B | Lake Elsinore Storm | 24 | 06/19/2024 | Laval | CAN | Right | Right | 6' 2" | 200 lbs | - |
| Oakes, Mike | RP | Dunedin Blue Jays | 23 | 07/08/2025 | Brooklyn | USA | Left | Left | 6' 4" | 200 lbs | - |
| Ocampo, Ignacio | LF | Palm Beach Cardinals | 19 | 01/15/2029 | Fajardo | PUR | Left | Left | 6' 2" | 175 lbs | - |
| Ochoa, Willie | C | Lakeland Flying Tigers | 26 | 06/12/2022 | San Diego | USA | Right | Right | 6' 5" | 205 lbs | - |
| Oetker, Terry | 1B | Fort Myers Miracle | 21 | 04/12/2027 | Euless | USA | Right | Right | 6' 5" | 205 lbs | - |
| Oglesby, Chris | RP | Rancho Cucamonga Quakes | 18 | 04/07/2030 | Mundelein | USA | Right | Right | 5' 10" | 160 lbs | - |
| Oliver, Mike | RP | Charlotte Stone Crabs | 20 | 04/13/2028 | Rubidoux | USA | Right | Right | 6' 6" | 195 lbs | - |
| Olivo, Jon | RP | Salem Red Sox | 24 | 07/07/2024 | Coyuca | MEX | Right | Right | 6' 7" | 200 lbs | - |
| Olujimi, Iften | SS | Tampa Yankees | 25 | 07/13/2023 | Cape Town | RSA | Right | Right | 6' 1" | 200 lbs | - |
| Olvera, Tony | CF | Potomac Nationals | 18 | 02/02/2030 | Waspan | NCA | Left | Left | 6' 4" | 185 lbs | - |
| Ontiveros, Melvin | SP | Wilmington Blue Rocks | 20 | 02/17/2028 | Kissimmee | USA | Left | Left | 6' 1" | 180 lbs | - |
| Ordonez, Juan | CF | Lynchburg Hillcats | 21 | 05/24/2027 | Santo Domingo | DOM | Right | Right | 6' 3" | 190 lbs | - |
| Orengo, Melvin | SP | Myrtle Beach Pelicans | 20 | 08/29/2028 | El Viejo | NCA | Right | Right | 6' 4" | 170 lbs | - |
| Orosco, Adrian | 1B | Wilmington Blue Rocks | 24 | 03/12/2024 | Madera Acres | USA | Switch | Left | 6' 2" | 200 lbs | - |
| Orozco, Dan | SS | Myrtle Beach Pelicans | 20 | 05/21/2028 | Hot Springs | USA | Right | Right | 5' 11" | 190 lbs | - |
| Ortega, Franklin | 3B | Potomac Nationals | 19 | 05/15/2029 | Havana | CUB | Right | Right | 6' 2" | 195 lbs | - |
| Ortiz, Jon | LF | Potomac Nationals | 20 | 07/12/2028 | Panama | PAN | Right | Right | 6' 4" | 195 lbs | - |
| Ortiz, Ricardo | 1B | Lake Elsinore Storm | 23 | 04/23/2025 | Detroit | USA | Right | Right | 6' 1" | 205 lbs | - |
| Osorio, Travis | SP | Visalia Rawhide | 22 | 01/19/2026 | Laurence Harbor | USA | Left | Left | 6' 2" | 185 lbs | - |
| Ott, Dan | RP | High Desert Mavericks | 25 | 03/02/2023 | Zillah | USA | Switch | Left | 6' 0" | 190 lbs | - |
| Oyler, Adam | SP | Lakeland Flying Tigers | 23 | 03/04/2025 | Santa Rosa | USA | Right | Right | 6' 1" | 190 lbs | - |
| Oyola, Antonio | LF | Bakersfield Blaze | 23 | 07/28/2025 | Mariara | VEN | Right | Right | 6' 3" | 205 lbs | - |
