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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Farrell, David | SP | Buffalo White Walkers | 34 | 02/04/2021 | Lutherville-Timonium | USA | Left | Left | 6' 3" | 200 lbs | $750,000 |
| O'Quinlevan, Dana | C | Athletic Club KC | 35 | 04/03/2020 | Vallejo | USA | Right | Right | 6' 0" | 200 lbs | $1,550,000 |
| O'Reilly, Robert | RP | Athletic Club KC | 26 | 03/09/2029 | Manhattan | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Odilia, Jesús | SS | Buffalo White Walkers | 33 | 12/05/2021 | Cotuí | DOM | Right | Right | 6' 1" | 195 lbs | $280,000 |
| Ohayashi, Koryusai | LF | Athletic Club KC | 36 | 04/26/2019 | Tomakomai | JPN | Switch | Right | 6' 4" | 190 lbs | - |
| Ojíto, Ricardo | RF | Ft. Worth Cattlemen | 33 | 03/05/2022 | Tres Ríos | CRC | Right | Right | 6' 1" | 200 lbs | $1,300,000 |
| Olieman, Tonny | 2B | New Orleans Voodoo | 28 | 05/09/2026 | Cul De Sac | SIM | Right | Right | 6' 1" | 205 lbs | $2,600,000 |
| Olson, Craig | SP | Free Agent | 20 | 03/10/2035 | Chestnut Ridge | USA | Right | Right | 6' 2" | 185 lbs | - |
| Ooyendijk, Melis | RP | New Orleans Voodoo | 26 | 12/28/2028 | Willemstad | CUR | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Orosco, Gregorio | SP | Free Agent | 23 | 09/08/2031 | San Francisco de Macorís | DOM | Right | Right | 6' 4" | 190 lbs | - |
| Ortega, Oliver | RF | St. Louis Coeur | 24 | 07/22/2030 | Tres Ríos | CRC | Left | Left | 6' 2" | 200 lbs | $280,000 |
| Ortíz, Xavier | SS | Vancouver Grey Wolves | 28 | 10/16/2026 | Tierra Blanca | CRC | Right | Right | 6' 1" | 185 lbs | $7,000,000 |
| Osborn, Steve | RP | Free Agent | 23 | 09/29/2031 | Dayton | USA | Right | Right | 6' 6" | 230 lbs | - |
| Osborne, Stanley | SP | St. Louis Coeur | 29 | 06/19/2025 | Syosset | USA | Left | Left | 6' 2" | 200 lbs | $430,000 |
| Ow, Tuo-zhou | SP | Athletic Club KC | 16 | 09/11/2038 | Shantou | CHN | Left | Left | 6' 1" | 170 lbs | - |
| Owen, Doug | RP | Vancouver Grey Wolves | 27 | 10/25/2027 | Carrollton | USA | Left | Left | 6' 0" | 195 lbs | $450,000 |
