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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Bronagham, Wilfred | RP | Free Agent | 22 | 08/13/2029 | Southwick | USA | Right | Right | 5' 11" | 175 lbs | - |
| O'Neil, José | RP | Missoula Osprey | 21 | 06/22/2030 | San Francisco | USA | Right | Right | 6' 5" | 215 lbs | - |
| Ochoa, Pablo | SP | Idaho Falls Chukars | 25 | 10/15/2026 | Sulphur | USA | Right | Right | 6' 2" | 205 lbs | - |
| Ohara, Kojuro | LF | Free Agent | 24 | 02/05/2027 | Tokyo | JPN | Right | Left | 6' 4" | 220 lbs | - |
| Ohayashi, Katsunan | C | Grand Junction Rockies | 21 | 04/11/2030 | Nagareyama | JPN | Switch | Right | 5' 9" | 165 lbs | - |
| Ohayashi, Minoru | C | Idaho Falls Chukars | 21 | 03/28/2030 | Kyoto | JPN | Switch | Right | 6' 4" | 205 lbs | - |
| Okada, Yoshimasa | C | Helena Brewers | 22 | 10/29/2029 | Ichikawa | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Oliver, Larry | 2B | Grand Junction Rockies | 20 | 04/24/2031 | Bensenville | USA | Right | Right | 6' 1" | 180 lbs | - |
| Ontiveros, Ricardo | RP | Orem Owlz | 19 | 01/06/2032 | Chiantla | GUA | Left | Right | 5' 11" | 165 lbs | - |
| Ortíz, Jorge | C | Helena Brewers | 22 | 07/31/2029 | Palmyra | USA | Left | Right | 6' 2" | 210 lbs | - |
| Owens, Arnold | RP | Missoula Osprey | 22 | 07/27/2029 | Saint Paul | USA | Right | Right | 6' 0" | 190 lbs | - |
