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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Billy | SP | Free Agent | 17 | 07/09/2022 | Greenville | USA | Right | Right | 5' 11" | 165 lbs | - |
| O'Brien, Jim | SP | Free Agent | 15 | 06/22/2024 | Hudson | USA | Left | Left | 6' 2" | 165 lbs | - |
| O'Connell, Jake | SS | Chicago White Sox | 23 | 10/18/2016 | Waterboro | USA | Right | Right | 6' 7" | 200 lbs | $720,000 |
| O'Connor, Jimmy | RP | Free Agent | 17 | 05/24/2022 | Fircrest | USA | Left | Left | 6' 0" | 170 lbs | - |
| O'Donnell, Jon | 2B | San Francisco Giants | 25 | 03/05/2015 | Clarendon | USA | Right | Right | 6' 0" | 190 lbs | - |
| O'Donnell, Josh | 2B | Houston Astros | 25 | 07/08/2014 | Naperville | USA | Right | Right | 6' 4" | 200 lbs | $720,000 |
| O'Donohue, Chris | RP | Free Agent | 17 | 08/19/2022 | Middletown Township | USA | Right | Left | 6' 0" | 165 lbs | - |
| O'Maley, Mike | CF | New York Mets | 22 | 05/12/2017 | Portland | USA | Right | Right | 6' 1" | 195 lbs | - |
| O'Malley, Chris | RF | New York Yankees | 34 | 01/25/2006 | Talladega | USA | Switch | Right | 6' 1" | 200 lbs | $3,120,000 |
| O'Neill, Rio | LF | Atlanta Braves | 29 | 12/20/2010 | Oranjestad | ARU | Left | Right | 5' 11" | 190 lbs | - |
| O'Reilly, Mike | SS | Free Agent | 21 | 12/23/2018 | Norman | USA | Right | Right | 6' 0" | 180 lbs | - |
| O'Shoney, Joe | 1B | Free Agent | 18 | 03/08/2022 | McKinney | USA | Right | Right | 6' 1" | 175 lbs | - |
| Oates, Chad | SP | Free Agent | 19 | 06/09/2020 | Stafford | USA | Left | Left | 6' 0" | 180 lbs | - |
| Ocasio, Roger | RP | New York Mets | 19 | 11/01/2020 | Ciudad Guayana | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Ochoa, Andres | C | St. Louis Cardinals | 34 | 05/28/2005 | San Mateo | VEN | Right | Right | 6' 1" | 200 lbs | $1,200,000 |
| Ochoa, Hector | 3B | Houston Astros | 23 | 07/17/2016 | Maracay | VEN | Switch | Right | 6' 0" | 185 lbs | $720,000 |
| Ochoa, Tony | SS | New York Mets | 18 | 08/24/2021 | Santo Domingo | DOM | Switch | Right | 6' 3" | 180 lbs | - |
| Ochoa, William | SP | Detroit Tigers | 16 | 10/12/2023 | Hato Mayor | DOM | Right | Right | 6' 1" | 170 lbs | - |
| Ogden, Chad | 3B | Free Agent | 18 | 10/09/2021 | Tucson | USA | Right | Right | 6' 2" | 185 lbs | - |
| Oglesby, Jim | 3B | Free Agent | 18 | 06/03/2021 | Chicago | USA | Switch | Right | 6' 0" | 180 lbs | - |
| Oglesby, Joe | C | Free Agent | 21 | 01/07/2019 | Basalt | USA | Right | Right | 6' 0" | 195 lbs | - |
| Okabe, Kosami | SP | Milwaukee Brewers | 31 | 12/08/2008 | Nagasaki | JPN | Switch | Right | 6' 2" | 185 lbs | $8,900,000 |
| Oliver, Mike | 2B | Texas Rangers | 29 | 08/25/2010 | Forest Grove | USA | Switch | Right | 6' 1" | 200 lbs | - |
| Olivier, Dave | RF | Free Agent | 27 | 01/14/2013 | Brandon | USA | Right | Right | 6' 3" | 200 lbs | - |
| Olmos Jr., Edgar | SP | Free Agent | 17 | 08/12/2022 | Kenmore | USA | Right | Right | 6' 2" | 165 lbs | - |
| Olson, Bobby | CF | San Francisco Giants | 30 | 09/18/2009 | Bellevue | USA | Switch | Right | 6' 1" | 205 lbs | $720,000 |
| Olson, Jeremy | 1B | Free Agent | 30 | 10/07/2009 | Bridgewater Township | USA | Right | Right | 6' 4" | 195 lbs | - |
| Olson, Pat | CF | Free Agent | 18 | 01/03/2022 | Charles City | USA | Left | Left | 6' 1" | 170 lbs | - |
| Oluoch, Ixzi | RP | Chicago White Sox | 31 | 04/09/2008 | Pretoria | RSA | Left | Left | 6' 1" | 185 lbs | $1,200,000 |
| Olvera, Bill | RP | St. Louis Cardinals | 34 | 10/22/2005 | Sun City Center | USA | Right | Right | 6' 0" | 195 lbs | $2,080,000 |
| Ong, Bobby | RP | Free Agent | 17 | 07/09/2022 | Plymouth Township | USA | Right | Right | 6' 7" | 200 lbs | - |
| Ong, Wing-chiu | RP | St. Louis Cardinals | 37 | 09/12/2002 | Hsinying | TPE | Right | Right | 6' 1" | 205 lbs | $3,600,000 |
| Opie, Walter | SP | Toronto Blue Jays | 19 | 03/25/2021 | Perth | AUS | Right | Right | 6' 0" | 170 lbs | - |
| Ormonde, Pat | CF | Cincinnati Reds | 27 | 01/22/2013 | New Baltimore | USA | Right | Right | 6' 0" | 190 lbs | $2,572,800 |
| Ornelas, Tobias | SS | Minnesota Twins | 18 | 01/26/2022 | Santa Teresa | VEN | Left | Right | 6' 2" | 180 lbs | - |
| Oropesa, Edwin | C | Philadelphia Phillies | 19 | 09/15/2020 | Kralendijk | ANT | Left | Right | 6' 0" | 190 lbs | - |
| Orozco, Marco | C | Pittsburgh Pirates | 18 | 12/17/2021 | Maracaibo | VEN | Right | Right | 6' 5" | 215 lbs | - |
| Orris, J.J. | 2B | Free Agent | 17 | 01/02/2023 | Davie | USA | Switch | Right | 5' 11" | 170 lbs | - |
| Ortega, Ruben | SP | Detroit Tigers | 18 | 07/01/2021 | Barquisimeto | VEN | Left | Left | 6' 2" | 185 lbs | - |
| Ortez, Dennis | CF | San Diego Padres | 17 | 02/28/2023 | Sint Nicolas | ARU | Left | Right | 6' 2" | 180 lbs | - |
| Ortis, Alex | SP | Washington Nationals | 33 | 06/03/2006 | Simi Valley | USA | Left | Left | 6' 2" | 200 lbs | $20,000,000 |
| Ortiz, Dave | SP | St. Louis Cardinals | 35 | 01/06/2005 | Santo Domingo | DOM | Left | Right | 6' 4" | 200 lbs | $24,900,000 |
| Ortiz, Eddie | 3B | St. Louis Cardinals | 18 | 12/01/2021 | Santiago | DOM | Left | Right | 6' 2" | 195 lbs | - |
| Ortiz, Jimmy | CF | Free Agent | 15 | 05/29/2024 | Colorado Springs | USA | Right | Right | 6' 1" | 165 lbs | - |
| Ortiz, Jon | RP | Free Agent | 16 | 05/08/2023 | Asheville | USA | Right | Right | 6' 2" | 175 lbs | - |
| Ortiz, Juan | C | Free Agent | 18 | 07/25/2021 | Westminster | USA | Left | Right | 5' 11" | 180 lbs | - |
| Ortiz, Leo | C | Chicago Cubs | 30 | 12/19/2009 | Willemstad | CUR | Right | Right | 6' 4" | 205 lbs | $720,000 |
| Ortiz, Manny | 1B | Seattle Mariners | 25 | 06/12/2014 | North Adams | USA | Right | Right | 6' 5" | 200 lbs | - |
| Ortiz, Sergio | 1B | New York Yankees | 21 | 07/09/2018 | San Francisco de Macorís | DOM | Right | Right | 6' 5" | 205 lbs | - |
| Ortiz, Victor | SP | Oakland Athletics | 16 | 04/14/2023 | Mao | DOM | Left | Right | 6' 4" | 185 lbs | - |
| Osaki, Tsugunosuke | CF | Houston Astros | 26 | 11/13/2013 | Utsunomiya | JPN | Right | Right | 6' 4" | 205 lbs | $35,600,000 |
| Osorio, Jose | CF | Miami Marlins | 27 | 03/22/2013 | San Francisco de Macorís | DOM | Right | Right | 6' 0" | 200 lbs | $720,000 |
| Otero, Orlando | SP | Cincinnati Reds | 16 | 06/30/2023 | Quimbaya | COL | Left | Left | 6' 2" | 170 lbs | - |
| Otten, Phil | SP | Free Agent | 16 | 10/23/2023 | Edison | USA | Right | Right | 6' 4" | 185 lbs | - |
| Outlaw, Eric | RP | Texas Rangers | 23 | 07/21/2016 | San Antonio | USA | Right | Right | 6' 7" | 200 lbs | - |
| Ovalle, Moises | C | Montreal Expos | 18 | 12/17/2021 | Maracay | VEN | Right | Right | 6' 5" | 200 lbs | - |
| Overby, Jeremy | 1B | Free Agent | 17 | 10/07/2022 | Chandler | USA | Right | Right | 6' 7" | 225 lbs | - |
| Overton, Mike | SP | Baltimore Orioles | 32 | 10/11/2007 | San Jose | USA | Left | Right | 6' 2" | 200 lbs | $4,000,000 |
| Owens, Jon | LF | Oakland Athletics | 26 | 02/02/2014 | East Flat Rock | USA | Right | Left | 6' 2" | 200 lbs | $720,000 |
| Owens, Sam | SP | Free Agent | 22 | 05/19/2017 | Boise | USA | Right | Right | 5' 9" | 175 lbs | - |
| Oxley, Nate | LF | Free Agent | 17 | 11/12/2022 | Bristol | USA | Right | Right | 6' 4" | 205 lbs | - |
| Ozaeta, Jose | RP | Free Agent | 34 | 04/11/2005 | Nuevo Laredo | MEX | Right | Right | 6' 1" | 195 lbs | - |
