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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Tyler | RP | Philadelphia Keystones | 17 | 06/20/1993 | Kingston | JAM | Left | Right | 6' 6" | 195 lbs | - |
| O'Connor, Jimmy | 1B | Free Agent | 36 | 08/25/1974 | Merced | USA | Right | Right | 6' 0" | 200 lbs | - |
| O'Neill, Josh | CL | Toronto Titans | 23 | 01/19/1987 | Ellwood City | USA | Right | Right | 6' 0" | 185 lbs | $100,000 |
| Oba, Taketo | C | St. Louis Lions | 17 | 11/05/1993 | Tobetsu | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Obuya, Tsige | CF | Chicago Blackhawks | 16 | 02/12/1994 | Accra | GHA | Left | Left | 5' 10" | 170 lbs | - |
| Ocasio, Mike | SP | Philadelphia Keystones | 25 | 01/02/1985 | Honolulu | USA | Right | Right | 6' 4" | 205 lbs | $100,000 |
| Okeke, Ronald | CF | Boston Shamrocks | 16 | 03/11/1994 | Soweto | RSA | Right | Left | 6' 5" | 200 lbs | - |
| Okimura, Anrrique | RF | Atlanta Pilots | 16 | 05/09/1994 | Salvador | BRA | Left | Right | 6' 2" | 175 lbs | - |
| Oldfield, Chris | 1B | Free Agent | 34 | 11/08/1976 | Davenport | USA | Right | Right | 6' 2" | 205 lbs | - |
| Ollson, Robin | SP | Las Vegas Aces | 29 | 10/04/1981 | Mandurah | AUS | Right | Right | 6' 7" | 200 lbs | $100,000 |
| Olson, Josh | RF | Boston Shamrocks | 26 | 06/04/1984 | Roosevelt | USA | Left | Left | 6' 3" | 195 lbs | $100,000 |
| On, Sung-ho | CF | Los Angeles Knights | 17 | 04/26/1993 | Cheonan | KOR | Switch | Right | 6' 4" | 205 lbs | - |
| Ontiveros, Alex | CF | Detroit Motors | 16 | 01/12/1994 | Villa Nueva | GUA | Left | Left | 5' 11" | 170 lbs | - |
| Orellana, Manny | SP | Boston Shamrocks | 29 | 11/14/1981 | St. Cloud | USA | Left | Left | 6' 0" | 185 lbs | $820,000 |
| Ortega, Carlos | C | Houston Mavericks | 16 | 01/14/1994 | San Marcos | SLV | Left | Right | 6' 2" | 195 lbs | - |
| Ortiz, Edward | 2B | Boston Shamrocks | 17 | 06/07/1993 | Jutiapa | GUA | Right | Right | 6' 0" | 165 lbs | - |
| Otani, Kosho | SP | Free Agent | 31 | 10/17/1979 | Ushiku | JPN | Right | Right | 5' 11" | 190 lbs | - |
| Ottens, Austin | SS | San Francisco Peanuts | 25 | 07/17/1985 | Salem | USA | Right | Right | 6' 2" | 190 lbs | $100,000 |
| Ozawa, Katsutaka | 1B | El Paso Diablos | 30 | 01/22/1980 | Kanazawa | JPN | Right | Right | 6' 2" | 205 lbs | $600,000 |
