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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Canavan, Jonathan | RP | Free Agent | 22 | 03/14/2021 | Sherwood | USA | Right | Right | 6' 2" | 195 lbs | - |
| O'Coleman, Billy | SP | Free Agent | 23 | 07/04/2020 | Pleasant Garden | USA | Right | Right | 6' 4" | 205 lbs | - |
| O'Donnell, Jon | 2B | Free Agent | 20 | 06/05/2023 | Clearlake | USA | Right | Right | 6' 2" | 190 lbs | - |
| O'Keefe, Harvey | RP | Free Agent | 20 | 04/15/2023 | Somerset | USA | Left | Left | 6' 4" | 195 lbs | - |
| O'Quinn, Dave | SP | Free Agent | 21 | 10/30/2022 | Farmington | USA | Right | Right | 5' 10" | 180 lbs | - |
| O'Rourke, Mike | SP | Free Agent | 20 | 08/14/2023 | Tillmans Corner | USA | Left | Left | 6' 3" | 185 lbs | - |
| Ocasio, Gilberto | RF | Hollywood Shredders | 31 | 10/29/2012 | Burbank | USA | Left | Right | 6' 2" | 215 lbs | $6,000,000 |
| Odom, Carson | SP | Free Agent | 22 | 03/08/2021 | Luna Pier | USA | Right | Right | 6' 1" | 180 lbs | - |
| Ohm, Jae-woo | LF | Boston Patriots | 25 | 12/05/2018 | Gongju | KOR | Switch | Right | 6' 8" | 230 lbs | $7,160,000 |
| Okamoto, Takeo | CF | Buffalo White Walkers | 16 | 04/16/2027 | Yokohama | JPN | Right | Right | 6' 2" | 170 lbs | - |
| Olartecoechea, Pablo | CF | Greenville 84s | 17 | 02/17/2026 | Chanco | CHI | Right | Right | 6' 1" | 170 lbs | - |
| Olieman, Tonny | CF | Baltimore Bullets | 17 | 05/09/2026 | Cul De Sac | SIM | Right | Right | 6' 0" | 165 lbs | - |
| Olivant, Elton | SS | Long Island Lighthouse | 18 | 06/20/2025 | Anotto Bay | JAM | Switch | Right | 6' 1" | 170 lbs | - |
| Oliver, Andrew | CF | Free Agent | 19 | 07/15/2024 | Bethpage | USA | Right | Right | 5' 11" | 175 lbs | - |
| Oliver, Hambleton | RF | Free Agent | 18 | 12/22/2025 | Crescent City North | USA | Left | Left | 6' 0" | 175 lbs | - |
| Olthof, Gerold | C | Long Island Lighthouse | 32 | 06/23/2011 | Veghel | NED | Right | Right | 6' 1" | 210 lbs | $1,000,000 |
| Orlebar, Gerald | SP | Baltimore Bullets | 29 | 04/07/2014 | Kingston | JAM | Left | Left | 6' 2" | 205 lbs | $9,390,000 |
| Ortíz, Miguel | RF | Free Agent | 23 | 03/03/2020 | Ponce | PUR | Left | Left | 6' 3" | 205 lbs | - |
| Ortíz, Tony | SP | Free Agent | 24 | 09/29/2019 | Philadelphia | USA | Right | Right | 6' 1" | 200 lbs | - |
| Osterman, Jon | RF | Boston Patriots | 36 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 205 lbs | $1,000,000 |
| Ott, Rob | CF | Free Agent | 18 | 08/23/2025 | Shorewood | USA | Right | Right | 6' 2" | 185 lbs | - |
| Owens, Dave | SP | Free Agent | 25 | 03/22/2018 | Bensalem Township | USA | Right | Right | 5' 10" | 170 lbs | - |
| Owens, Nolan | SP | Buffalo White Walkers | 24 | 08/26/2019 | Elkhart | USA | Switch | Right | 6' 7" | 220 lbs | $280,000 |
| Özdemir, Gökhan | 1B | New Orleans Voodoo | 18 | 11/20/2025 | Çayeli | TUR | Left | Left | 6' 4" | 220 lbs | - |
