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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connor, Benny | 1B | Detroit (WIN) Tigers | 27 | 05/04/2021 | Racine | USA | Right | Right | 6' 6" | 200 lbs | - |
| O'Malley, Brandon | CF | Detroit (WIN) Tigers | 24 | 09/17/2024 | Fairfax | USA | Right | Left | 6' 1" | 195 lbs | - |
| O'Reilly, Rick | LF | Cleveland (WIN) Indians | 28 | 12/28/2020 | Toronto | CAN | Right | Right | 6' 2" | 200 lbs | $1,265,000 |
| O'Toole, Barrfhionn | RF | Los Angeles (WIN) Angels | 28 | 03/16/2020 | Roscrea | IRL | Left | Left | 6' 3" | 200 lbs | - |
| Ochoa, Gabe | SS | Cincinnati (WIN) Reds | 26 | 12/04/2022 | Puebla | MEX | Right | Right | 6' 1" | 200 lbs | - |
| Oki, Yutaka | CF | Arizona (WIN) Diamondbacks | 26 | 06/02/2022 | Yokohama | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Okimura, Hideo | RF | Seattle (WIN) Mariners | 25 | 11/11/2023 | Iwaki | JPN | Right | Right | 6' 6" | 200 lbs | $675,000 |
| Olech, Jeff | SP | Atlanta (WIN) Braves | 28 | 10/11/2020 | Columbia | USA | Switch | Right | 6' 0" | 175 lbs | - |
| Oliveri, Evan | C | Washington (WIN) Nationals | 25 | 10/18/2023 | Kensington Park | USA | Left | Left | 6' 0" | 200 lbs | - |
| Oliynyk, Matviy | 3B | Asheville Tourists | 23 | 04/23/2025 | Lutsk | UKR | Right | Right | 6' 8" | 220 lbs | - |
| Olkowicz, Ernest | LF | Arizona (WIN) Diamondbacks | 28 | 01/08/2020 | Jesup | USA | Right | Right | 6' 7" | 200 lbs | - |
| Olson, J.P. | CF | Arizona (WIN) Diamondbacks | 26 | 10/01/2022 | Weslaco | USA | Left | Left | 6' 4" | 200 lbs | - |
| Olson, Scott | RP | Toronto (WIN) Blue Jays | 24 | 09/12/2024 | Red Bank | USA | Right | Right | 5' 11" | 185 lbs | - |
| Olvera, Hector | RF | Minnesota (WIN) Twins | 22 | 04/08/2026 | Santiago de Cuba | CUB | Left | Left | 6' 2" | 175 lbs | - |
| Ontiveros, Jose | CF | Toronto (WIN) Blue Jays | 26 | 08/29/2022 | San Pedro de Macorís | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Oropeza, Angel | RF | Chicago (WIN) Cubs | 22 | 08/05/2026 | San Antonio | USA | Left | Left | 6' 6" | 205 lbs | - |
| Orr, Bryant | RP | Baltimore (WIN) Orioles | 24 | 08/09/2024 | Kennewick | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortiz, Edgar | 1B | Kansas City (WIN) Royals | 21 | 04/06/2027 | Guacara | VEN | Left | Right | 6' 4" | 200 lbs | - |
| Osborn, Tim | 2B | New York (WIN) Yankees | 25 | 07/07/2023 | Taber | CAN | Right | Right | 5' 11" | 195 lbs | - |
| Osborne, Jack | SP | Toronto (WIN) Blue Jays | 20 | 08/26/2028 | Melbourne | AUS | Right | Left | 6' 8" | 200 lbs | - |
| Osgood, Mike | RP | Arizona (WIN) Diamondbacks | 23 | 11/01/2025 | Detroit | USA | Left | Right | 6' 5" | 200 lbs | - |
| Osting, Chris | LF | Asheville Tourists | 24 | 08/14/2024 | North Creek | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ott, Butch | SP | Kansas City (WIN) Royals | 23 | 05/20/2025 | Suffolk | USA | Left | Left | 6' 4" | 200 lbs | - |
| Oviedo, David | CL | Philadelphia (WIN) Phillies | 21 | 04/02/2027 | Chesterfield | USA | Right | Right | 6' 2" | 200 lbs | - |
