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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Brian, Pat | 2B | Free Agent | 27 | 05/24/1989 | Trent Woods | USA | Right | Right | 6' 0" | 206 lbs | - |
| O'Cornyn, Ralph | RF | Free Agent | 27 | 09/16/1989 | Tucson | USA | Left | Left | 6' 3" | 247 lbs | - |
| O'Day, Jaime | C | Free Agent | 23 | 06/05/1993 | Holyoke | USA | Right | Right | 6' 5" | 220 lbs | - |
| O'Higgins, Dan | LF | Free Agent | 29 | 09/02/1987 | Framingham | USA | Right | Right | 6' 0" | 183 lbs | - |
| O'Mulvey, Ron | LF | Free Agent | 26 | 11/10/1990 | Richmond Heights | USA | Left | Left | 6' 3" | 192 lbs | - |
| O'Neal, Joe | RF | Free Agent | 28 | 08/01/1988 | Corralitos | USA | Left | Left | 6' 6" | 218 lbs | - |
| O'Neil, Jerry | 2B | Houston Sting | 18 | 08/05/1998 | Gatineau | CAN | Left | Right | 5' 8" | 195 lbs | - |
| O'Neill, Myles | CF | Huntsville Sabercats | 18 | 12/07/1998 | Ottawa | CAN | Right | Right | 6' 0" | 155 lbs | - |
| O'Quinn, Edward | LF | Free Agent | 26 | 09/02/1990 | Chicago | USA | Right | Left | 6' 3" | 230 lbs | - |
| O'Rorke, Everett | CF | Westside Road Warriors | 22 | 01/24/1994 | San Marcos | USA | Right | Right | 6' 2" | 185 lbs | - |
| Ochoa, José | MR | Westside Road Warriors | 18 | 06/15/1998 | Los Teques | VEN | Switch | Right | 6' 0" | 245 lbs | - |
| Ochoa, Juan | CF | Free Agent | 28 | 07/08/1988 | Las Cruces | USA | Right | Right | 6' 2" | 146 lbs | - |
| Ogawa, Hidehira | LF | Houston Sting | 19 | 07/28/1997 | Himeji | JPN | Left | Right | 6' 5" | 205 lbs | - |
| Ogawa, Tomohiko | LF | Huntsville Sabercats | 18 | 10/08/1998 | Nirasaki | JPN | Left | Left | 6' 0" | 220 lbs | - |
| Oger, Joël | 3B | Chippewa River Chiefs | 26 | 05/21/1990 | Toronto | CAN | Right | Right | 6' 2" | 167 lbs | - |
| Ogura, Nobukazu | LF | Chippewa River Chiefs | 22 | 09/06/1994 | Kumamoto | JPN | Left | Left | 6' 4" | 200 lbs | - |
| Ohayashi, Masu | RF | Free Agent | 31 | 10/25/1985 | Inagawa | JPN | Left | Left | 6' 0" | 188 lbs | - |
| Ohayashi, Matsu | RF | Free Agent | 35 | 09/23/1981 | Hirakata | JPN | Left | Left | 6' 0" | 219 lbs | - |
| Ohayashi, Shirai | MR | Dearborn Pioneers | 21 | 12/21/1995 | Nara | JPN | Right | Right | 5' 10" | 225 lbs | - |
| Ohayashi, Takahashi | RF | Free Agent | 26 | 06/20/1990 | Kawasaki | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Ohayashi, Tatsukichi | CF | Roman Fascists | 22 | 07/03/1994 | Mino | JPN | Right | Left | 6' 1" | 205 lbs | - |
| Ojeda, Carlos | MR | Kingwood Knights | 22 | 09/02/1994 | Levittown | PUR | Right | Right | 6' 2" | 225 lbs | - |
| Ojima, Keitaro | 1B | Palm Beach Bums | 25 | 12/04/1991 | Yame | JPN | Right | Right | 6' 3" | 235 lbs | - |
| Okada, Nobuyoshi | SP | Free Agent | 25 | 12/21/1991 | Kawagoe | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Okamoto, Yachi | SS | Palm Beach Bums | 20 | 08/03/1996 | Osaka | JPN | Right | Right | 5' 10" | 180 lbs | - |
| Okawa, Yoichibei | LF | Free Agent | 36 | 06/08/1980 | Hachinohe | JPN | Switch | Right | 6' 1" | 195 lbs | - |
| Okumura, Izumo | MR | Roman Fascists | 21 | 04/17/1995 | Tokyo | JPN | Right | Right | 6' 8" | 250 lbs | - |
| Oliuo, Luis | SS | Free Agent | 27 | 06/26/1989 | Central Falls | USA | Right | Right | 6' 0" | 234 lbs | - |
| Olson, Aaron | 1B | Free Agent | 23 | 05/09/1993 | Baltimore | USA | Right | Right | 6' 5" | 215 lbs | - |
| Olson, Eric | CF | Free Agent | 27 | 09/22/1989 | Ridgeland | USA | Right | Right | 6' 0" | 222 lbs | - |
| Olson, Wayne | LF | Penzance Pirates | 22 | 02/15/1994 | Chevy Chase | USA | Left | Right | 6' 5" | 160 lbs | - |
| Olvera, Guillermo | LF | Penzance Pirates | 22 | 12/27/1994 | Trinidad | CRC | Right | Right | 6' 0" | 220 lbs | - |
| Ono, Mitsuhide | SP | Baltimore Blue Claws | 20 | 07/16/1996 | Hamamatsu | JPN | Switch | Right | 6' 9" | 210 lbs | - |
| Ono, Tsurayuki | SP | Bel Air Princes | 24 | 10/08/1992 | Ichinomiya | JPN | Right | Right | 6' 5" | 215 lbs | - |
| Onodera, Ichizo | LF | Huntsville Sabercats | 18 | 07/11/1998 | Mizumaki | JPN | Left | Left | 5' 11" | 185 lbs | - |
| Oram, Rick | MR | Penzance Pirates | 21 | 11/06/1995 | Montreal | CAN | Right | Left | 6' 2" | 180 lbs | - |
| Orozco, Adrián | SP | Roman Fascists | 24 | 12/16/1992 | West Valley City | USA | Right | Right | 6' 3" | 227 lbs | - |
| Orozco, Sergio | LF | Westside Road Warriors | 22 | 03/06/1994 | Caracas | VEN | Switch | Right | 6' 4" | 170 lbs | - |
| Ortega, Eduardo | MR | Dearborn Pioneers | 20 | 06/18/1996 | Guayama | PUR | Right | Right | 5' 11" | 215 lbs | - |
| Ortíz, Dani | CF | Free Agent | 28 | 11/08/1988 | Esperanza | DOM | Right | Right | 6' 3" | 224 lbs | - |
| Ortíz, Jesús | CL | Huntsville Sabercats | 23 | 11/23/1993 | Santiago | DOM | Right | Right | 6' 2" | 215 lbs | - |
| Ortíz, Jorge | MR | Nichols Gnats | 21 | 08/11/1995 | Carrizal | VEN | Left | Left | 6' 0" | 200 lbs | - |
| Ortíz, José | SP | Free Agent | 26 | 10/03/1990 | Kokomo | USA | Left | Left | 6' 1" | 208 lbs | - |
| Ortíz, Juan | SP | St. Paul Saints | 20 | 06/30/1996 | Ponce | PUR | Right | Right | 5' 10" | 250 lbs | - |
| Ortíz, Raúl | MR | Free Agent | 28 | 10/01/1988 | Charleston | USA | Right | Right | 6' 1" | 216 lbs | - |
| Orton, Don | CF | Roman Fascists | 20 | 03/30/1996 | Trois-Rivičres | CAN | Right | Right | 6' 1" | 195 lbs | - |
| Osborn, Pete | RF | Las Vegas Lost | 31 | 04/22/1985 | Farnham | CAN | Left | Left | 6' 2" | 184 lbs | - |
| Osburn, Harold | MR | Free Agent | 25 | 01/16/1991 | Deltona | USA | Left | Left | 6' 0" | 200 lbs | - |
| Oshima, Junji | LF | Free Agent | 21 | 03/04/1995 | Ichinomiya | JPN | Left | Left | 6' 1" | 185 lbs | - |
| Oshima, Motoyuki | MR | Free Agent | 21 | 02/14/1995 | Hasuda | JPN | Right | Right | 6' 1" | 225 lbs | - |
| Osorio, José | 1B | Free Agent | 27 | 04/05/1989 | Lawrence | USA | Left | Right | 6' 2" | 225 lbs | - |
| Ota, Makoto | CF | Victoria Vikings | 20 | 05/15/1996 | Tahara | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Otero, Vicente | MR | Coney Island Cyclones | 20 | 05/29/1996 | Guantanamo | CUB | Left | Left | 5' 9" | 220 lbs | - |
| Ottaway, Quentin | LF | Bethesda Hornets | 27 | 01/09/1989 | Perth | AUS | Left | Left | 6' 1" | 195 lbs | - |
| Owens, Nathan | MR | Barrow Frosties | 21 | 05/11/1995 | Edmonton | CAN | Left | Left | 6' 3" | 230 lbs | - |
| Oyama, Shunso | MR | Free Agent | 25 | 09/16/1991 | Yamato | JPN | Left | Left | 6' 7" | 222 lbs | - |
