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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Canavan, Jonathan | RP | Free Agent | 25 | 03/14/2021 | Sherwood | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Coleman, Billy | RP | Free Agent | 26 | 07/04/2020 | Pleasant Garden | USA | Right | Right | 6' 4" | 205 lbs | - |
| O'Quinlevan, Dana | C | Seattle Rocketeers | 26 | 04/03/2020 | Vallejo | USA | Right | Right | 6' 0" | 200 lbs | $1,300,000 |
| Obregón, Gabriel | 1B | Free Agent | 30 | 08/21/2016 | Puerto Armuelles | PAN | Left | Right | 6' 2" | 210 lbs | - |
| Odom, Carson | SP | Free Agent | 25 | 03/08/2021 | Luna Pier | USA | Right | Right | 6' 1" | 190 lbs | - |
| Ohayashi, Koryusai | LF | Greenville 84s | 27 | 04/26/2019 | Tomakomai | JPN | Switch | Right | 6' 4" | 210 lbs | $12,000,000 |
| Ohayashi, Yaichiro | SP | Long Island Lighthouse | 18 | 10/26/2028 | Kodaira | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Okel, Gavin | CF | Nova Scotia Leviathan | 26 | 12/25/2020 | San Ignacio | BLZ | Switch | Right | 6' 3" | 200 lbs | $280,000 |
| Onishi, Yasuhiko | C | Free Agent | 30 | 02/13/2016 | Kushiro | JPN | Switch | Right | 5' 11" | 205 lbs | - |
| Oostermeer, Nils | SP | Nova Scotia Leviathan | 16 | 01/24/2030 | Cul De Sac | SIM | Right | Right | 6' 2" | 175 lbs | - |
| Orozco, António | LF | San Mateo Dirty Reds | 22 | 01/23/2024 | Rodas | CUB | Right | Right | 6' 2" | 190 lbs | $280,000 |
| Ortega, Carlos | RP | Athletic Club KC | 27 | 10/01/2019 | Hazard | USA | Right | Left | 6' 0" | 195 lbs | $430,000 |
| Ortega, Ricardo | CF | Northern Virginia Rainbow Mermaids | 17 | 05/22/2029 | Barquisimeto | VEN | Right | Left | 6' 0" | 175 lbs | - |
| Ortíz, Héctor | SS | Pittsburgh Kingfishers | 17 | 05/05/2029 | Patarra | CRC | Right | Right | 6' 3" | 180 lbs | - |
| Ortíz, Miguel | LF | Free Agent | 26 | 03/03/2020 | Ponce | PUR | Left | Left | 6' 3" | 205 lbs | - |
| Ortíz, Vicente | SP | Nova Scotia Leviathan | 16 | 08/16/2030 | Buenos Aires | ARG | Right | Left | 5' 10" | 155 lbs | - |
| Osorio, Lorenzo | SS | Free Agent | 17 | 05/28/2029 | San José | CRC | Right | Right | 6' 2" | 170 lbs | - |
| Ota, Yakamochi | 3B | Free Agent | 33 | 02/03/2013 | Kishiwada | JPN | Right | Right | 5' 10" | 200 lbs | - |
| Ottens, Aldo | SP | Long Island Lighthouse | 32 | 09/07/2014 | Sint Michiel | CUR | Right | Right | 6' 3" | 190 lbs | $2,500,000 |
