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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Dea, Matt | 1B | Aberdeen Ironbirds | 23 | 12/30/2023 | East Bethel | USA | Right | Right | 6' 3" | 205 lbs | - |
| O'Neal, Josh | RP | Hudson Valley Renegades | 21 | 02/14/2026 | St. Johns | USA | Right | Right | 6' 2" | 185 lbs | - |
| Obote, Areda | RF | Tri-City ValleyCats | 24 | 11/22/2023 | Khorixas | NAM | Right | Right | 6' 0" | 195 lbs | - |
| Ochoa, Javier | 1B | Free Agent | 28 | 12/10/2019 | Kennewick | USA | Right | Right | 6' 6" | 200 lbs | - |
| Odom, Danny | C | Spokane Indians | 35 | 10/27/2012 | Elkhart | USA | Right | Right | 6' 2" | 205 lbs | - |
| Ogasawara, Ryuki | SS | Hillsboro Hops | 33 | 09/14/2014 | Yokohama | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Ogilvie, Jamie | 3B | Vancouver Canadians | 36 | 01/01/2011 | New York | USA | Right | Right | 6' 1" | 200 lbs | - |
| Oldfield, Adam | LF | Aberdeen Ironbirds | 24 | 11/10/2023 | Prescott Valley | USA | Left | Right | 6' 1" | 200 lbs | - |
| Olivares, C.J. | LF | Milwaukee (NYP) Brewers | 22 | 01/22/2025 | Brooklyn | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Olmqvist, Påske | SP | Chicago (NYP) White Sox | 31 | 07/05/2016 | Göteborg | SWE | Right | Right | 6' 2" | 200 lbs | - |
| Olson, John | SP | Everett AquaSox | 18 | 03/10/2029 | Reno | USA | Right | Right | 6' 2" | 190 lbs | - |
| Orozco, Dan | SS | Eugene Emeralds | 19 | 05/21/2028 | Hot Springs | USA | Right | Right | 5' 11" | 185 lbs | - |
| Orozco, Victor | 3B | Lowell Spinners | 28 | 10/01/2019 | Santo Domingo | DOM | Right | Right | 6' 3" | 200 lbs | - |
| Ortega, Alfonso | RP | Free Agent | 28 | 02/26/2019 | Tuxtla Gutiérrez | MEX | Right | Right | 6' 3" | 200 lbs | - |
| Ortiz, Ricardo | 1B | Tri-City Dust Devils | 22 | 04/23/2025 | Detroit | USA | Right | Right | 6' 1" | 205 lbs | - |
| Ostrom, Jason | CF | Free Agent | 26 | 10/10/2021 | Levittown | USA | Right | Right | 6' 1" | 200 lbs | - |
| Ostrowski, Cy | 1B | Free Agent | 27 | 12/08/2020 | Elkhart | USA | Left | Left | 6' 2" | 200 lbs | - |
| Osumi, Yasushi | RP | Chicago (NYP) White Sox | 33 | 04/02/2014 | Saijo | JPN | Left | Right | 6' 4" | 200 lbs | - |
| Ott, Lee | SP | Free Agent | 27 | 06/12/2020 | Los Angeles | USA | Right | Right | 6' 8" | 200 lbs | - |
| Otton, Jared | RP | Free Agent | 33 | 11/16/2014 | Phoenix | USA | Right | Right | 5' 11" | 200 lbs | - |
| Oya, Kunimatsu | SS | Chicago (NYP) White Sox | 25 | 02/02/2022 | Iwaki | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Oyola, Antonio | LF | Everett AquaSox | 22 | 07/28/2025 | Mariara | VEN | Right | Right | 6' 3" | 200 lbs | - |
| Ozuna, Nelson | RF | Free Agent | 31 | 08/21/2016 | San Cristóbal | DOM | Right | Right | 6' 1" | 200 lbs | - |
