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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Malley, Brandon | LF | Detroit (WIN) Tigers | 25 | 09/17/2024 | Fairfax | USA | Right | Left | 6' 1" | 200 lbs | $675,000 |
| O'Neal, Justin | 2B | New York (WIN) Yankees | 23 | 12/05/2026 | Murfreesboro | USA | Left | Right | 6' 6" | 200 lbs | - |
| Obawole, Torquato | 2B | Miami (WIN) Marlins | 26 | 02/01/2023 | Quinhamel | GNB | Right | Right | 6' 1" | 200 lbs | - |
| Ocampo, Ignacio | LF | St. Louis (WIN) Cardinals | 20 | 01/15/2029 | Fajardo | PUR | Left | Left | 6' 2" | 175 lbs | - |
| Okimura, Hideo | RF | Seattle (WIN) Mariners | 26 | 11/11/2023 | Iwaki | JPN | Right | Right | 6' 6" | 200 lbs | $675,000 |
| Olbera, Carlos | RP | Los Angeles (WIN) Angels | 22 | 05/17/2027 | Santo Domingo | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Oliver, Mike | RP | Tampa Bay (WIN) Rays | 21 | 04/13/2028 | Rubidoux | USA | Right | Right | 6' 6" | 200 lbs | - |
| Oliveri, Evan | C | Washington (WIN) Nationals | 26 | 10/18/2023 | Kensington Park | USA | Left | Left | 6' 0" | 200 lbs | - |
| Olivo, Frank | LF | Boston (WIN) Red Sox | 24 | 01/10/2025 | Murrells Inlet | USA | Left | Right | 6' 0" | 200 lbs | - |
| Olkowicz, Ernest | LF | Arizona (WIN) Diamondbacks | 29 | 01/08/2020 | Jesup | USA | Right | Right | 6' 7" | 200 lbs | - |
| Olson, Scott | RP | Toronto (WIN) Blue Jays | 25 | 09/12/2024 | Red Bank | USA | Right | Right | 5' 11" | 195 lbs | $675,000 |
| Oropeza, Angel | RF | Chicago (WIN) Cubs | 23 | 08/05/2026 | San Antonio | USA | Left | Left | 6' 6" | 205 lbs | - |
| Orphan, Matthew | SP | Kansas City (WIN) Royals | 25 | 02/13/2024 | Hillsborough | USA | Right | Right | 6' 2" | 200 lbs | $675,000 |
| Orr, Bryant | RP | Baltimore (WIN) Orioles | 25 | 08/09/2024 | Kennewick | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortiz, Jorge | SP | Houston (WIN) Astros | 21 | 11/29/2028 | Dajabón | DOM | Right | Left | 6' 1" | 175 lbs | - |
| Ortiz, Tony | SP | Cincinnati (WIN) Reds | 25 | 10/15/2024 | La Victoria | VEN | Right | Right | 5' 9" | 180 lbs | $675,000 |
| Osborn, Tim | 2B | New York (WIN) Yankees | 26 | 07/07/2023 | Taber | CAN | Right | Right | 5' 11" | 195 lbs | - |
| Osborne, Harry | RP | St. Louis (WIN) Cardinals | 26 | 10/04/2023 | Trois-Rivières | CAN | Left | Left | 6' 6" | 205 lbs | - |
| Osgood, Mike | RP | Arizona (WIN) Diamondbacks | 24 | 11/01/2025 | Detroit | USA | Left | Right | 6' 5" | 200 lbs | $675,000 |
| Osting, Chris | LF | Asheville Tourists | 25 | 08/14/2024 | North Creek | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ostrom, Jason | RF | Texas (WIN) Rangers | 28 | 10/10/2021 | Levittown | USA | Right | Right | 6' 1" | 200 lbs | - |
