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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Canavan, Jonathan | RP | Free Agent | 24 | 03/14/2021 | Sherwood | USA | Right | Right | 6' 2" | 200 lbs | - |
| O'Coleman, Billy | SP | Free Agent | 25 | 07/04/2020 | Pleasant Garden | USA | Right | Right | 6' 4" | 205 lbs | - |
| O'Donnell, Bailey | SP | Charleston Battery | 23 | 01/21/2022 | Gulfport | USA | Left | Left | 6' 0" | 180 lbs | $280,000 |
| O'Quinlevan, Dana | C | Seattle Rocketeers | 25 | 04/03/2020 | Vallejo | USA | Right | Right | 6' 0" | 205 lbs | $1,300,000 |
| Odom, Carson | SP | Free Agent | 24 | 03/08/2021 | Luna Pier | USA | Right | Right | 6' 1" | 185 lbs | - |
| Ohayashi, Yaichiro | SP | Long Island Lighthouse | 17 | 10/26/2028 | Kodaira | JPN | Right | Right | 6' 0" | 170 lbs | - |
| Okamoto, Takeo | CF | Buffalo White Walkers | 18 | 04/16/2027 | Yokohama | JPN | Right | Right | 6' 2" | 175 lbs | - |
| Onishi, Yasuhiko | C | Seattle Rocketeers | 29 | 02/13/2016 | Kushiro | JPN | Switch | Right | 5' 11" | 205 lbs | $3,400,000 |
| Ortega, Carlos | RP | Athletic Club KC | 26 | 10/01/2019 | Hazard | USA | Right | Left | 6' 0" | 190 lbs | $280,000 |
| Ortega, Ricardo | CF | Northern Virginia Rainbow Mermaids | 16 | 05/22/2029 | Barquisimeto | VEN | Right | Left | 6' 0" | 175 lbs | - |
| Ortíz, Héctor | SS | Pittsburgh Kingfishers | 16 | 05/05/2029 | Patarra | CRC | Right | Right | 6' 2" | 175 lbs | - |
| Ortíz, Miguel | RF | Free Agent | 25 | 03/03/2020 | Ponce | PUR | Left | Left | 6' 3" | 210 lbs | - |
| Ortíz, Tony | RP | Free Agent | 26 | 09/29/2019 | Philadelphia | USA | Right | Right | 6' 1" | 205 lbs | - |
| Ota, Yakamochi | 3B | Seattle Rocketeers | 32 | 02/03/2013 | Kishiwada | JPN | Right | Right | 5' 10" | 195 lbs | $980,000 |
| Ottens, Aldo | SP | Boston Patriots | 31 | 09/07/2014 | Sint Michiel | CUR | Right | Right | 6' 3" | 190 lbs | $480,000 |
