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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Callaghan, Wes | 1B | Augusta GreenJackets | 22 | 11/14/2038 | Beverly Hills | USA | Right | Right | 6' 0" | 185 lbs | - |
| O'Meara, Jovi | RP | West Virginia Power | 21 | 09/11/2039 | Madison Heights | USA | Right | Right | 6' 5" | 200 lbs | - |
| O'Sullivan, Joshua | RP | Clinton LumberKings | 25 | 08/24/2036 | Oakville | USA | Right | Right | 6' 4" | 200 lbs | - |
| Ochoa, Dani | SP | Charleston RiverDogs | 24 | 07/15/2037 | Sogamoso | COL | Right | Right | 6' 4" | 200 lbs | - |
| Ochoa, Shan | SP | West Michigan Whitecaps | 23 | 07/27/2038 | North Attleborough | USA | Left | Left | 6' 2" | 180 lbs | - |
| Odell, Mason | RP | Fond du Lac Dock Spiders | 22 | 05/05/2039 | Broken Arrow | USA | Right | Right | 6' 5" | 200 lbs | - |
| Ogando, Yainier | RP | Lansing Lugnuts | 21 | 01/19/2040 | Boca Chica | DOM | Left | Left | 6' 2" | 180 lbs | - |
| Ogden, R.J. | SP | Greensboro Grasshoppers | 21 | 09/17/2039 | Ventura | USA | Switch | Right | 6' 3" | 180 lbs | - |
| Ogg, John | LF | Greensboro Grasshoppers | 21 | 11/08/2039 | Dallas | USA | Left | Right | 6' 0" | 180 lbs | - |
| Oldham, Kayden | CF | Great Lakes Loons | 20 | 09/24/2040 | Corpus Christi | USA | Right | Left | 6' 2" | 170 lbs | - |
| Olmeda, Alonso | RP | Madison Muskies | 23 | 10/12/2037 | Santo Domingo | DOM | Right | Right | 6' 1" | 190 lbs | - |
| Olney, Ronan | LF | Greensboro Grasshoppers | 21 | 05/15/2040 | Sunnyside | USA | Left | Left | 6' 6" | 200 lbs | - |
| Olteanu, Alexandru | SP | Cedar Rapids Haymakers | 24 | 06/29/2037 | Bucharest | ROM | Right | Left | 6' 5" | 200 lbs | - |
| Ontiveros, Marco | RP | West Virginia Power | 22 | 06/09/2039 | Barquisimeto | VEN | Left | Left | 6' 2" | 195 lbs | - |
| Ore, Nathan | SP | Quad Cities River Bandits | 22 | 06/17/2039 | Charlotte | USA | Right | Right | 6' 2" | 170 lbs | - |
| Ortega, Cristián | RF | Dayton Dragons | 24 | 08/18/2037 | San Juan | PUR | Left | Left | 6' 0" | 200 lbs | - |
| Ortega, Warren | 1B | Free Agent | 25 | 04/28/2036 | Avon Lake | USA | Left | Right | 6' 4" | 200 lbs | - |
| Ortiz, Sammie | SP | Wisconsin Timber Rattlers | 21 | 03/16/2040 | Ecatepec | MEX | Right | Right | 6' 7" | 200 lbs | - |
| Ortmeyer, Chance | SP | Columbus Catfish | 23 | 08/18/2038 | Anderson | USA | Switch | Right | 6' 5" | 200 lbs | - |
| Ouellette, David | SP | Savannah Bananas | 23 | 11/16/2037 | River Grove | USA | Left | Left | 5' 10" | 165 lbs | - |
| Overbay, Chase | RF | Great Lakes Loons | 23 | 06/04/2038 | Glenview | USA | Left | Left | 6' 6" | 205 lbs | - |
| Oxendine, Major | RP | Free Agent | 24 | 11/22/2036 | Columbus | USA | Right | Left | 6' 0" | 175 lbs | - |
| Ozaki, Hideo | SP | Free Agent | 23 | 07/06/2038 | Fukuoka | JPN | Right | Right | 6' 1" | 180 lbs | - |
| Ozuna, Trinidad | 3B | Clinton LumberKings | 22 | 05/09/2039 | Guatire | VEN | Right | Right | 6' 2" | 195 lbs | - |
