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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brien, Buck | MR | Portland Protons | 33 | 05-09-1977 | Washington | USA | Right | Right | 5' 10" | 188 lbs | - |
| O'Neill, Steve | C | Vista Red Sox | 33 | 07-06-1977 | Henderson | USA | Right | Right | 5' 10" | 165 lbs | - |
| Oldring, Rube | CF | Toledo Gas House Gang | 30 | 05-30-1980 | Cleveland | USA | Right | Right | 5' 10" | 186 lbs | - |
| Oliva, Tony | RF | Belville Miners | 35 | 07-20-1975 | Brownsville | USA | Left | Right | 6' 2" | 190 lbs | - |
| Oliver, Al | 1B | Hamden Red Sox | 39 | 10-14-1970 | Chula Vista | USA | Left | Left | 6' 0" | 195 lbs | - |
| Ontiveros, Steve | MR | Round Rock Express | 28 | 03-05-1982 | Corpus Christi | USA | Right | Right | 6' 0" | 190 lbs | - |
| Orr, Dave | 1B | Reno Rustlers | 34 | 09-29-1975 | Phoenix | USA | Right | Right | 5' 10" | 250 lbs | - |
| Osteen, Claude | SP | Dearborn Heights Homers | 37 | 08-09-1973 | Walnut Creek | USA | Left | Left | 5' 10" | 173 lbs | - |
| Owen, Marv | 3B | GHosts of '84 | 32 | 03-22-1978 | Idaho Falls | USA | Right | Right | 6' 0" | 175 lbs | - |
