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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Sung-oo | SS | Free Agent | 26 | 05/21/2028 | Busan | KOR | Right | Right | 6' 3" | 190 lbs | - |
| O'Callahan, Ryan | 2B | Nashville Hot Chickens | 24 | 10/29/2030 | Atlanta | USA | Right | Right | 6' 4" | 200 lbs | $280,000 |
| O'Kennelly, Mike | RF | Austin Black Mambas | 26 | 11/10/2028 | Newburgh | USA | Left | Left | 6' 0" | 200 lbs | $280,000 |
| Ogasahara, Tadasu | LF | Free Agent | 30 | 10/13/2024 | Sendai | JPN | Left | Left | 6' 2" | 200 lbs | - |
| Ogasahara, Yoshitaka | RF | Nashville Hot Chickens | 27 | 01/06/2028 | Nagakute | JPN | Left | Left | 6' 1" | 200 lbs | - |
| Ogawa, Seitaro | CF | Sacramento Redlegs | 24 | 12/08/2030 | Gifu | JPN | Left | Left | 6' 5" | 205 lbs | - |
| Ohayashi, Koryusai | LF | Syracuse Squirrel Monkeys | 36 | 04/26/2019 | Tomakomai | JPN | Switch | Right | 6' 4" | 190 lbs | - |
| Olartecoechea, Pablo | CF | Santa Barbara Golden Cranes | 29 | 02/17/2026 | Chanco | CHI | Right | Right | 6' 2" | 200 lbs | - |
| Oleastro, Juan | RF | Hialeah Dodos | 37 | 01/13/2018 | Belén | NCA | Right | Right | 6' 0" | 205 lbs | - |
| Olivares, Edgardo | RP | Free Agent | 21 | 02/18/2034 | San Cristóbal | VEN | Right | Right | 6' 3" | 185 lbs | - |
| Oliver, Hambleton | RF | Port Royal Disaster | 29 | 12/22/2025 | Crescent City North | USA | Left | Left | 6' 0" | 200 lbs | - |
| Olsen, Tommy | SS | Vermont Lake Monsters | 24 | 03/26/2031 | Downey | USA | Left | Right | 6' 2" | 195 lbs | - |
| Oort, Steve | RP | Salt Lake City Buzz | 31 | 11/25/2023 | Willemstad | CUR | Right | Right | 6' 8" | 200 lbs | - |
