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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Paxton | C | Hudson Valley Renegades | 25 | 07/06/2027 | Parma | USA | Switch | Right | 6' 0" | 200 lbs | - |
| O'Dell, Stuart | SP | Martinez Clippers | 22 | 08/13/2029 | Crestview | USA | Right | Right | 6' 5" | 195 lbs | - |
| O'Neill, A.J. | SP | Ventura Gulls | 23 | 10/18/2028 | Tucson | USA | Left | Left | 6' 7" | 200 lbs | $500,000 |
| O'Sullivan, Dominic | 2B | Pittsburg Diamonds | 24 | 05/15/2028 | New York | USA | Right | Right | 6' 3" | 190 lbs | - |
| Oberhausen, Mason | SP | Bradenton Marauders | 25 | 02/23/2027 | Chicago | USA | Right | Right | 6' 2" | 200 lbs | - |
| Oberholtzer, Alex | RP | Free Agent | 26 | 05/04/2026 | Red Chute | USA | Left | Right | 6' 1" | 200 lbs | - |
| Ochoa, Cristo | SP | Lancaster JetHawks | 24 | 08/27/2027 | Guaynabo | PUR | Right | Right | 6' 5" | 210 lbs | - |
| Oko, Nathan | RP | Jupiter Hammerheads | 22 | 10/13/2029 | Brooklyn | USA | Right | Right | 6' 6" | 205 lbs | - |
| Okuma, Quincy | SP | Pittsburg Diamonds | 22 | 03/01/2030 | Citrus Heights | USA | Right | Right | 6' 2" | 195 lbs | - |
| Olajuwon, Keilan | SP | Virginia Beach Mariners | 23 | 01/30/2029 | Valinda | USA | Right | Right | 6' 3" | 200 lbs | - |
| Olguin, Josuan | 2B | High Desert Mavericks | 25 | 09/24/2026 | Santo Domingo | DOM | Right | Right | 6' 5" | 200 lbs | - |
| Olivas, Bram | SS | Modesto Nuts | 25 | 03/02/2027 | La Romana | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Olsen, Christopher | CF | Florida Fire Frogs | 25 | 01/31/2027 | Douglasville | USA | Right | Right | 6' 3" | 200 lbs | - |
| Oquendo, Leonardo | SP | Traverse City Pit Spitters | 23 | 01/10/2029 | Charleston | USA | Right | Right | 6' 2" | 195 lbs | - |
| Orsburn, Curran | LF | Free Agent | 23 | 03/21/2029 | West Chester | USA | Right | Left | 6' 6" | 200 lbs | - |
| Osmer, Lewis | CL | Jupiter Hammerheads | 25 | 06/30/2027 | New York | USA | Right | Right | 6' 3" | 185 lbs | - |
| Ospina, Alvin | SP | Carolina Mudcats | 23 | 11/05/2028 | Reading | USA | Right | Right | 6' 3" | 200 lbs | - |
| Ostray, Lendon | SP | Winston-Salem Dash | 24 | 03/23/2028 | Amsterdam | USA | Switch | Left | 6' 4" | 195 lbs | - |
| Otstot, Noe | C | Carolina Mudcats | 24 | 08/11/2027 | Darby | USA | Right | Right | 5' 9" | 185 lbs | - |
