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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Bryan, Elliott | SS | Free Agent | 18 | 06/16/2024 | Elk Grove | USA | Right | Right | 6' 4" | 185 lbs | - |
| O'Canavan, Jonathan | RP | Free Agent | 21 | 03/14/2021 | Sherwood | USA | Right | Right | 6' 2" | 195 lbs | - |
| O'Coleman, Billy | SP | Free Agent | 22 | 07/04/2020 | Pleasant Garden | USA | Right | Right | 6' 4" | 205 lbs | - |
| O'Connell, Colin | C | Buffalo White Walkers | 34 | 12/14/2008 | Dublin | IRL | Right | Right | 6' 2" | 205 lbs | $850,000 |
| O'Day, Greg | RF | Free Agent | 19 | 12/12/2023 | South Fulton | USA | Left | Left | 6' 5" | 205 lbs | - |
| O'Donnell, Jon | 2B | Free Agent | 19 | 06/05/2023 | Clearlake | USA | Right | Right | 6' 2" | 190 lbs | - |
| O'Heyne, Tim | SP | Free Agent | 18 | 01/21/2024 | Elizabeth | USA | Left | Left | 6' 1" | 175 lbs | - |
| O'Rorke, Jason | CF | Free Agent | 21 | 04/12/2021 | Stratford | USA | Right | Right | 6' 4" | 200 lbs | - |
| O'Rourke, Mike | SP | Free Agent | 19 | 08/14/2023 | Tillmans Corner | USA | Left | Left | 6' 3" | 185 lbs | - |
| O'Slattery, Nate | SP | Free Agent | 17 | 01/05/2025 | Rockwell | USA | Right | Right | 6' 2" | 175 lbs | - |
| Ocasio, Gilberto | RF | Hollywood Shredders | 30 | 10/29/2012 | Burbank | USA | Left | Right | 6' 2" | 215 lbs | $6,000,000 |
| Ochoa, Juan | SP | Detroit Elite | 20 | 09/18/2022 | Santo Domingo | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Odom, Carson | SP | Free Agent | 21 | 03/08/2021 | Luna Pier | USA | Right | Right | 6' 1" | 175 lbs | - |
| Ogawa, Torajiro | CF | Charleston Battery | 28 | 07/13/2014 | Utsunomiya | JPN | Right | Right | 6' 4" | 215 lbs | $600,000 |
| Ohm, Jae-woo | LF | Boston Patriots | 24 | 12/05/2018 | Gongju | KOR | Switch | Right | 6' 8" | 230 lbs | $280,000 |
| Oliver, Andrew | CF | Free Agent | 18 | 07/15/2024 | Bethpage | USA | Right | Right | 5' 11" | 170 lbs | - |
| Orlebar, Gerald | SP | Portland Evergreens | 28 | 04/07/2014 | Kingston | JAM | Left | Left | 6' 2" | 205 lbs | $9,390,000 |
| Oroto, Daniel | C | Free Agent | 31 | 12/17/2011 | San Juan | PUR | Right | Right | 6' 0" | 230 lbs | - |
| Ortíz, Miguel | RF | Free Agent | 22 | 03/03/2020 | Ponce | PUR | Left | Left | 6' 3" | 200 lbs | - |
| Ortíz, Tony | SP | Free Agent | 23 | 09/29/2019 | Philadelphia | USA | Right | Right | 6' 1" | 200 lbs | - |
| Osterman, Jon | RF | Boston Patriots | 35 | 09/26/2007 | Rammingen | GER | Right | Right | 6' 1" | 200 lbs | $1,000,000 |
| Overshown, DeMarvion | DH | Northern Virginia Rainbow Mermaids | 29 | 02/24/2013 | San Antonio | USA | Left | Left | 6' 6" | 240 lbs | $7,270,000 |
| Overwater, Herman | SP | Portland Evergreens | 18 | 04/15/2024 | Willemstad | CUR | Right | Right | 6' 8" | 205 lbs | - |
| Owens, Dave | SP | Free Agent | 24 | 03/22/2018 | Bensalem Township | USA | Right | Right | 5' 10" | 165 lbs | - |
| Owens, Jake | SP | Free Agent | 18 | 10/23/2024 | New Hope | USA | Switch | Right | 6' 1" | 185 lbs | - |
| Owens, Nolan | RP | Buffalo White Walkers | 23 | 08/26/2019 | Elkhart | USA | Switch | Right | 6' 7" | 220 lbs | $280,000 |
