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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Lee | SP | Lake County Captains | 23 | 09/11/2028 | South Kingstown | USA | Left | Left | 6' 2" | 180 lbs | - |
| O'Connor, Clint | SP | Lansing Lugnuts | 23 | 02/17/2029 | Montreal | CAN | Left | Left | 5' 10" | 185 lbs | - |
| O'Neal, Vern | RP | Columbus Catfish | 24 | 09/25/2027 | Old Forge | USA | Right | Right | 6' 3" | 190 lbs | - |
| O'Neil, Ryne | RP | Greensboro Grasshoppers | 22 | 10/01/2029 | Fall River | USA | Right | Right | 6' 4" | 200 lbs | - |
| Odom, Strom | C | Lansing Lugnuts | 23 | 05/03/2029 | Greenwich | USA | Right | Right | 6' 0" | 180 lbs | - |
| Ogando, Dale | RP | West Michigan Whitecaps | 22 | 04/08/2030 | Barahona | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Ogando, Orlando | LF | Great Lakes Loons | 21 | 10/24/2030 | San Juan | PUR | Right | Right | 6' 2" | 175 lbs | - |
| Olivarez, Rolando | LF | Lexington Legends | 23 | 11/19/2028 | Santo Domingo | DOM | Right | Right | 6' 0" | 195 lbs | - |
| Olsen, Conner | RP | Lexington Legends | 23 | 07/06/2029 | Westchase | USA | Right | Right | 6' 3" | 190 lbs | - |
| Olsen, Milton | C | Augusta GreenJackets | 24 | 09/27/2027 | Mesquite | USA | Right | Right | 6' 6" | 200 lbs | - |
| Ordaz, Blair | CF | Fort Wayne TinCaps | 22 | 06/04/2030 | Hampstead | USA | Left | Left | 6' 3" | 185 lbs | - |
| Ordoñez, Quirce | SP | Lansing Lugnuts | 21 | 07/25/2030 | Santo Domingo | DOM | Switch | Left | 6' 0" | 175 lbs | - |
| Orosco, Ismael | SP | Cedar Rapids Haymakers | 22 | 01/13/2030 | Santo Domingo | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Orozco, T.J. | RF | Lake County Captains | 23 | 01/19/2029 | Barcelona | VEN | Left | Left | 6' 4" | 200 lbs | - |
| Orr, Russ | RP | Augusta GreenJackets | 22 | 01/06/2030 | Delmar | USA | Right | Right | 6' 4" | 200 lbs | - |
| Ortiz, Darwin | CF | Greenville Drive | 21 | 01/31/2031 | Santo Domingo | DOM | Left | Right | 6' 2" | 185 lbs | - |
| Ortiz, Emanuel | 1B | Ames Sod Poodles | 21 | 07/31/2030 | Chicago | USA | Right | Right | 6' 5" | 200 lbs | - |
| Ostenson, Steve | C | Great Lakes Loons | 24 | 07/24/2027 | Jackson | USA | Left | Right | 6' 3" | 200 lbs | - |
| Oviedo, Martin | RP | Free Agent | 24 | 11/25/2027 | Cabral | DOM | Left | Right | 6' 1" | 195 lbs | - |
| Oxendine, Phil | RP | Greensboro Grasshoppers | 22 | 11/29/2029 | Mitchell | USA | Switch | Right | 6' 5" | 200 lbs | - |
