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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Brian | SP | Free Agent | 18 | 11/21/2027 | Baltimore | USA | Switch | Right | 6' 0" | 170 lbs | - |
| O'Brien, Mike | CF | Free Agent | 19 | 08/23/2026 | Pottstown | USA | Left | Left | 6' 3" | 185 lbs | - |
| O'Brien, R.J. | LF | Washington Nationals | 33 | 04/18/2012 | Danbury | USA | Left | Left | 6' 2" | 200 lbs | $26,000,000 |
| O'Connor, Josh | SP | Free Agent | 18 | 03/14/2027 | New York | USA | Left | Right | 6' 2" | 175 lbs | - |
| O'Reilly, Rick | LF | St. Louis Cardinals | 25 | 12/28/2020 | Toronto | CAN | Right | Right | 6' 2" | 200 lbs | $675,000 |
| Oakes, Eric | RP | Chicago Cubs | 25 | 10/30/2020 | Mitchellville | USA | Right | Right | 6' 5" | 200 lbs | $2,250,000 |
| Ocampo, Ignacio | CF | Free Agent | 16 | 01/15/2029 | Fajardo | PUR | Left | Left | 6' 2" | 165 lbs | - |
| Odom, Danny | C | California Angels | 33 | 10/27/2012 | Elkhart | USA | Right | Right | 6' 2" | 205 lbs | $26,000,000 |
| Ogle, Nick | LF | Cleveland Indians | 23 | 08/28/2022 | Flora | USA | Right | Right | 6' 4" | 200 lbs | - |
| Ogren, Bill | RP | Colorado Rockies | 24 | 12/10/2021 | DeFuniak Springs | USA | Right | Left | 6' 2" | 195 lbs | $675,000 |
| Ohmer, Austin | CF | Montreal Expos | 23 | 07/17/2022 | St. Joseph | USA | Left | Right | 5' 10" | 190 lbs | $675,000 |
| Ohnn, Young-kwang | C | Seattle Mariners | 27 | 05/04/2018 | Incheon | KOR | Right | Right | 6' 0" | 200 lbs | $1,350,000 |
| Olivares, Eric | RP | Free Agent | 19 | 10/19/2026 | Mansfield | USA | Right | Right | 6' 8" | 200 lbs | - |
| Olsen, Mike | CF | Free Agent | 19 | 12/17/2026 | Dent | USA | Left | Left | 6' 1" | 165 lbs | - |
| Olson Jr., Ben | RF | Free Agent | 18 | 09/24/2027 | Highland Park | USA | Left | Left | 5' 11" | 175 lbs | - |
| Omura, Katsumi | SP | Free Agent | 31 | 10/24/2014 | Ago | JPN | Switch | Left | 6' 1" | 180 lbs | - |
| Ono, Shigeru | RF | Washington Nationals | 22 | 04/22/2023 | Okinawa | JPN | Left | Left | 5' 11" | 185 lbs | - |
| Ornelas, Tomas | CF | Free Agent | 16 | 03/03/2029 | Bajos de Haina | DOM | Left | Right | 6' 2" | 180 lbs | - |
| Orosz, Earl | 3B | Free Agent | 21 | 05/11/2024 | Grain Valley | USA | Right | Right | 6' 2" | 195 lbs | - |
| Ortega, Kyle | SP | Free Agent | 18 | 09/03/2027 | Lawrenceville | USA | Right | Left | 6' 1" | 175 lbs | - |
| Ortega, Rich | RP | Arizona Diamondbacks | 36 | 08/27/2009 | La Vega | DOM | Right | Right | 6' 0" | 205 lbs | $4,000,000 |
| Ortiz, Tony | SP | Free Agent | 18 | 05/30/2027 | Terrell | USA | Right | Right | 5' 11" | 165 lbs | - |
| Orton, Ward | SS | Free Agent | 18 | 04/21/2027 | Vancouver | CAN | Right | Right | 6' 1" | 165 lbs | - |
| Ostrom, Jason | CF | Chicago Cubs | 24 | 10/10/2021 | Levittown | USA | Right | Right | 6' 1" | 195 lbs | $675,000 |
| Otero, Mario | 2B | Free Agent | 21 | 10/19/2024 | Santo Domingo | DOM | Right | Right | 6' 1" | 170 lbs | - |
| Ottinger, Corey | 3B | Seattle Mariners | 31 | 11/06/2014 | Madison | USA | Right | Right | 6' 2" | 200 lbs | $1,000,000 |
| Outen, Shane | 3B | Free Agent | 19 | 08/19/2026 | Las Vegas | USA | Right | Right | 6' 0" | 180 lbs | - |
| Ovando, Rafael | SS | Free Agent | 20 | 09/17/2025 | Wichita Falls | USA | Right | Right | 6' 2" | 170 lbs | - |
| Ovens-Toots, Kevin | SP | Atlanta Braves | 24 | 05/27/2021 | Lake Charles | USA | Right | Right | 6' 1" | 180 lbs | $30,000,000 |
| Overbeek, Jack | SP | Free Agent | 29 | 03/13/2016 | Tytsjerksteradiel | NED | Right | Right | 6' 6" | 200 lbs | - |
| Owens, John | RP | Oakland Athletics | 25 | 07/21/2020 | Norristown | USA | Right | Right | 6' 3" | 200 lbs | $675,000 |
