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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Meara, Dan | SP | Flint Coney Dogs | 25 | 08/07/2027 | Paoli | USA | Right | Right | 6' 6" | 205 lbs | $545,000 |
| O'Sullivan, Ferris | CF | Free Agent | 26 | 11/10/2026 | Limerick | IRL | Right | Right | 5' 11" | 190 lbs | - |
| Ocampo, Fernando | C | Flint Coney Dogs | 23 | 01/26/2030 | Santo Domingo | DOM | Right | Right | 6' 7" | 205 lbs | - |
| Ochoa, Victor | CF | Free Agent | 31 | 05/23/2021 | Nagua | DOM | Left | Left | 5' 11" | 190 lbs | - |
| Ochoa, Vinny | SP | Ho Chi Minh City Tigers | 30 | 08/05/2022 | El Vigía | VEN | Right | Right | 6' 4" | 205 lbs | $545,000 |
| Odeneal, Chris | 2B | Free Agent | 30 | 07/27/2022 | Lincoln | USA | Right | Right | 6' 4" | 205 lbs | - |
| Ogan, Adam | LF | Free Agent | 31 | 05/01/2022 | Columbus | USA | Right | Right | 6' 3" | 200 lbs | - |
| Ohata, Kanezane | 2B | Free Agent | 32 | 10/09/2020 | Fukuyama | JPN | Switch | Right | 6' 2" | 205 lbs | - |
| Ojeda, Raul | CF | Free Agent | 27 | 11/13/2025 | Barquisimeto | VEN | Right | Left | 6' 3" | 205 lbs | - |
| Orozco, Armando | 2B | Rochester River Sharks | 23 | 06/23/2029 | Santo Domingo | DOM | Left | Right | 6' 3" | 200 lbs | $545,000 |
| Ortiz, Enrique | 1B | Phoenix Palisades | 27 | 01/17/2026 | Libertyville | USA | Right | Right | 6' 4" | 205 lbs | $545,000 |
| Oswald, Jesse | LF | Kinsale Fisherman | 29 | 12/02/2023 | Mansfield Center | USA | Switch | Right | 6' 2" | 195 lbs | $4,625,000 |
| Ottoboni, Quintino | CF | Philadelphia Avalanche | 22 | 03/08/2031 | Lagunillas | VEN | Right | Right | 6' 3" | 185 lbs | $545,000 |
| Ouchi, Shuhei | RP | Philadelphia Avalanche | 34 | 02/09/2019 | Miyakonojo | JPN | Left | Left | 6' 0" | 205 lbs | $28,000,000 |
| Overman, Matt | SP | Memphis BBQ | 24 | 05/04/2029 | Yarmouth | USA | Left | Left | 6' 5" | 205 lbs | - |
