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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Connell, Bobby | SP | Buffalo Bisons | 34 | 12/25/2011 | Colorado Springs | USA | Right | Right | 6' 0" | 190 lbs | - |
| O'Hare, Adam | LF | Iowa Cubs | 26 | 01/11/2019 | Fairview Park | USA | Right | Right | 6' 0" | 185 lbs | $650,000 |
| O'Leary, Bobby | 3B | Memphis Redbirds | 23 | 10/16/2022 | Clarksville | USA | Switch | Right | 6' 0" | 195 lbs | - |
| O'Toole, Barrfhionn | RF | Salt Lake Bees | 25 | 03/16/2020 | Roscrea | IRL | Left | Left | 6' 3" | 200 lbs | - |
| Oba, Tetsuya | 1B | Albuquerque Isotopes | 30 | 08/30/2015 | Yamagata | JPN | Left | Right | 6' 0" | 185 lbs | $850,000 |
| Ochoa, Gabe | SS | Sacramento River Cats | 23 | 12/04/2022 | Puebla | MEX | Right | Right | 6' 1" | 200 lbs | - |
| Ody, Adam | SP | Sacramento River Cats | 24 | 04/16/2021 | Raleigh | USA | Left | Left | 6' 5" | 200 lbs | - |
| Ogasawara, Ryuki | SS | New Orleans Zephyrs | 31 | 09/14/2014 | Yokohama | JPN | Right | Right | 6' 2" | 195 lbs | - |
| Ogilvie, Jamie | 3B | Free Agent | 34 | 01/01/2011 | New York | USA | Right | Right | 6' 1" | 195 lbs | - |
| Oki, Yutaka | CF | Sacramento River Cats | 23 | 06/02/2022 | Yokohama | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Okuhara, Sumiki | LF | Free Agent | 32 | 02/18/2013 | Atsugi | JPN | Left | Left | 6' 1" | 195 lbs | - |
| Olson, J.P. | CF | Sacramento River Cats | 23 | 10/01/2022 | Weslaco | USA | Left | Left | 6' 4" | 200 lbs | - |
| Ou-yang, Zhi-bin | 2B | Free Agent | 33 | 12/19/2012 | Kaohsiung | TPE | Right | Right | 6' 1" | 200 lbs | - |
| Oxenrider, Alan | 3B | Free Agent | 32 | 11/14/2013 | Lyman | USA | Right | Right | 6' 2" | 200 lbs | - |
