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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Aaron | RP | Grand Junction Rockies | 21 | 10/24/2029 | Tamalpais-Homestead Valley | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Dwyer, Jim | 1B | Pulaski Yankees | 21 | 09/29/2029 | Montreal | CAN | Right | Right | 6' 5" | 210 lbs | - |
| Ochoa, Willie | C | Detroit (APP) Tigers | 28 | 06/12/2022 | San Diego | USA | Right | Right | 6' 5" | 200 lbs | - |
| Ogura, Masami | RP | Cleveland (APP) Indians | 21 | 09/29/2029 | Nara | JPN | Right | Right | 6' 6" | 200 lbs | - |
| Ogura, Takao | CF | Miami (APP) Marlins | 22 | 03/09/2028 | Sapporo | JPN | Left | Left | 6' 4" | 200 lbs | - |
| Ohmer, Adrian | CF | Cleveland (APP) Indians | 21 | 01/23/2029 | St. Joseph | USA | Switch | Left | 5' 10" | 200 lbs | - |
| Ojeda, Manny | RP | Seattle (APP) Mariners | 22 | 09/18/2028 | Santo Domingo | DOM | Switch | Right | 6' 2" | 195 lbs | - |
| Okura, Yukitsura | 3B | Texas (APP) Rangers | 18 | 06/01/2032 | Maebashi | JPN | Left | Right | 6' 3" | 185 lbs | - |
| Oliva, Noe | CF | San Francisco (APP) Giants | 22 | 04/25/2028 | San Carlos | NCA | Right | Right | 6' 4" | 200 lbs | - |
| Oliveros, Juan | RP | Billings Mustangs | 22 | 12/11/2028 | San Andrés | PAN | Right | Right | 6' 5" | 200 lbs | - |
| Olmos, Tony | 1B | Miami (APP) Marlins | 19 | 04/21/2031 | Detroit | USA | Left | Left | 6' 2" | 200 lbs | - |
| Olson, Jerry | LF | Texas (APP) Rangers | 18 | 04/25/2032 | Leon Valley | USA | Right | Right | 6' 1" | 155 lbs | - |
| Omori, Toshikatsu | 1B | Princeton Rays | 24 | 07/19/2026 | Kitakyushu | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Oram, Dorian | 1B | Cleveland (APP) Indians | 22 | 03/24/2028 | Los Angeles | USA | Left | Left | 6' 3" | 200 lbs | - |
| Ortega, Jose | SP | Danville Braves | 19 | 04/07/2031 | West Covina | USA | Right | Right | 5' 11" | 165 lbs | - |
| Ortegon, Luis | LF | Miami (APP) Marlins | 19 | 08/09/2031 | Westmont | USA | Left | Left | 6' 6" | 200 lbs | - |
| Ortiz, Albert | C | Texas (APP) Rangers | 25 | 03/02/2025 | Poteet | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Ortiz, Dave | C | Pulaski Yankees | 22 | 11/23/2028 | Güira de Melena | CUB | Left | Right | 6' 1" | 200 lbs | - |
| Ortiz, Jose | RP | Washington (APP) Nationals | 21 | 07/01/2029 | Masaya | NCA | Right | Right | 6' 0" | 190 lbs | - |
| Ortiz, Robert | RF | Baltimore (APP) Orioles | 22 | 11/08/2028 | Río Grande | PUR | Left | Left | 6' 8" | 200 lbs | - |
| Ortiz, Tony | SP | Bluefield Blue Jays | 21 | 11/30/2029 | Santiago | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Ortman, Lou | CF | Washington (APP) Nationals | 18 | 06/18/2032 | Glassboro | USA | Right | Left | 6' 1" | 165 lbs | - |
| Osorio, Juan | SP | Grand Junction Rockies | 20 | 09/22/2030 | Los Angeles | USA | Right | Right | 6' 5" | 200 lbs | - |
| Otieno, Lencho | SS | Chicago (APP) Cubs | 22 | 11/09/2028 | Garissa | KEN | Right | Right | 6' 5" | 205 lbs | - |
