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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brian, Rory | SS | Southern Miss Confederates | 19 | 06/28/2020 | Fort Worth | USA | Right | Right | 6' 1" | 175 lbs | - |
| O'Brian, Terry | SP | Louisville High Fives | 20 | 02/06/2020 | Dryden | USA | Right | Left | 6' 1" | 180 lbs | - |
| O'Brien, John | 2B | Washington State Palouse Knights | 20 | 11/13/2019 | Wanaque | USA | Right | Right | 6' 0" | 175 lbs | - |
| O'Brien, Matt | SP | Southern Miss Confederates | 21 | 12/08/2018 | Moab | USA | Switch | Left | 6' 2" | 185 lbs | - |
| O'Brien, Paul | SP | USC Travelers | 20 | 09/23/2019 | Corpus Christi | USA | Right | Right | 6' 4" | 200 lbs | - |
| O'Bryan, Ryan | RP | Indiana Big Daddies | 18 | 07/09/2021 | Phenix City | USA | Switch | Right | 6' 2" | 185 lbs | - |
| O'Day, Sandy | RP | Michigan Red Dawns | 18 | 02/21/2022 | Philadelphia | USA | Left | Left | 6' 1" | 175 lbs | - |
| O'Hyes, Harry | RP | Washington State Palouse Knights | 20 | 11/25/2019 | Saddle River | USA | Right | Right | 6' 6" | 190 lbs | - |
| O'Kernaghan, Ed | C | Washington State Palouse Knights | 21 | 04/12/2019 | Benavides | USA | Right | Right | 6' 1" | 190 lbs | - |
| O'Neal, Ray | LF | Minnesota Lucky Rodents | 20 | 03/08/2020 | Chicago | USA | Left | Right | 6' 2" | 195 lbs | - |
| O'Neil, Gordon | SP | Villanova Starbursts | 18 | 11/12/2021 | New York | USA | Left | Left | 6' 2" | 185 lbs | - |
| O'Neil, Mike | SP | Rice Puddings | 19 | 08/28/2020 | Carrollton | USA | Switch | Right | 6' 2" | 185 lbs | - |
| O'Neil, William | SP | Marshall McConaugheys | 20 | 05/05/2019 | Omaha | USA | Right | Right | 6' 6" | 205 lbs | - |
| O'Neill, Carl | LF | USC Travelers | 19 | 05/04/2020 | Salinas | USA | Right | Right | 6' 4" | 210 lbs | - |
| O'Quinn, Mike | CL | Rutgers Old Queens | 21 | 02/15/2019 | Brooklyn | USA | Switch | Right | 6' 1" | 185 lbs | - |
| Oilvares, Guillermo | C | Oregon State Dambusters | 19 | 12/28/2020 | Riverbank | USA | Right | Right | 6' 1" | 200 lbs | - |
| Okazaki, Eiichi | C | Purdue Astronauts | 20 | 07/11/2019 | Koshi | JPN | Right | Right | 6' 5" | 195 lbs | - |
| Oliver, Carl | RP | Indiana Big Daddies | 18 | 12/17/2021 | Oak Park | USA | Left | Right | 6' 1" | 185 lbs | - |
| Olson, Matt | C | Oregon State Dambusters | 18 | 02/01/2022 | Corvallis | USA | Right | Right | 6' 2" | 190 lbs | - |
| Ordóñez, Raúl | RP | USC Travelers | 18 | 10/24/2021 | Brentwood | USA | Right | Right | 6' 6" | 205 lbs | - |
| Orr, Will | CL | Michigan Red Dawns | 21 | 04/14/2019 | Sterling | USA | Left | Left | 6' 7" | 205 lbs | - |
| Ortega, Clement | RP | Central Florida Wicked Witches | 20 | 11/26/2019 | Trujillo Alto | PUR | Right | Right | 6' 2" | 190 lbs | - |
| Ortega, Dave | RP | Iowa Archers | 18 | 09/17/2021 | Savage | USA | Switch | Left | 6' 2" | 185 lbs | - |
| Ortega, Júlio | RP | Central Florida Wicked Witches | 21 | 11/23/2018 | Tampa | USA | Left | Left | 6' 4" | 200 lbs | - |
| Ortega, Vicente | 1B | Seton Hall Rampage | 18 | 06/25/2021 | Farmington Hills | USA | Right | Right | 5' 11" | 175 lbs | - |
| Ortíz, Armando | RP | Arizona Lutes | 21 | 01/20/2019 | San Juan | PUR | Right | Right | 6' 4" | 195 lbs | - |
| Ortíz, Gustavo | C | UAB Dragons | 20 | 05/15/2019 | Gate City | USA | Right | Right | 6' 2" | 200 lbs | - |
| Ortíz, Jorge | SP | Oregon State Dambusters | 18 | 06/27/2021 | Arden-Arcade | USA | Switch | Right | 6' 4" | 190 lbs | - |
| Ortíz, Pablo | RP | Stanford Axe | 19 | 10/21/2020 | Long Beach | USA | Switch | Right | 6' 2" | 185 lbs | - |
| Ortíz, Pablo | LF | Washington Montlake Malamutes | 21 | 02/24/2019 | East End | USA | Left | Left | 6' 5" | 200 lbs | - |
| Ortíz, Vincente | C | Louisville High Fives | 20 | 09/11/2019 | Temple City | USA | Right | Right | 5' 9" | 190 lbs | - |
| Ottens, Mark | RF | Villanova Starbursts | 19 | 12/26/2020 | Steenwijkerland | NED | Right | Right | 6' 3" | 190 lbs | - |
| Owen, Chris | CL | Villanova Starbursts | 18 | 09/09/2021 | Narragansett | USA | Right | Right | 6' 7" | 215 lbs | - |
| Owen, Jonathon | SP | Notre Dame Evangelists | 19 | 11/25/2020 | Rochester Hills | USA | Right | Right | 5' 11" | 175 lbs | - |
| Owens, Quinn | SP | Georgetown Stonewalls | 18 | 08/20/2021 | Stamford | USA | Right | Right | 5' 9" | 160 lbs | - |
