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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| O'Toole, Emory | MR | Murfreesboro Deacons | 26 | 06/27/1990 | Dunlap | USA | Right | Right | 6' 2" | 197 lbs | - |
| Ochoa, Jesús | 2B | Cincinnati Snaps | 27 | 06/04/1989 | Sacramento | USA | Right | Right | 5' 11" | 155 lbs | - |
| Ochoa, Pancho | MR | Long Island Ducks | 25 | 04/23/1991 | Chicago | USA | Right | Right | 6' 2" | 222 lbs | - |
| Ogawa, Hiroji | 1B | New York Ninjas | 22 | 07/15/1994 | Komatsu | JPN | Right | Right | 6' 1" | 165 lbs | - |
| Oglethorpe, Bryant | CL | Ottawa Outlaws | 25 | 03/12/1991 | Scottdale | USA | Left | Left | 6' 7" | 210 lbs | - |
| Ohashi, Sekien | 2B | Anniston Cougars | 25 | 08/22/1991 | Koshoku | JPN | Right | Right | 6' 1" | 170 lbs | - |
| Okamoto, Michihiro | CF | Frisco Rams | 22 | 06/01/1994 | Kitakami | JPN | Right | Left | 6' 0" | 205 lbs | - |
| Oliver, Harumi | 3B | Free Agent | 23 | 09/22/1993 | Visalia | USA | Right | Right | 6' 1" | 185 lbs | - |
| Olson, Denny | RF | Free Agent | 29 | 11/17/1987 | Statesboro | USA | Right | Right | 6' 3" | 180 lbs | - |
| Onishi, Hirohisa | MR | Lake of the Isles Wolves | 21 | 10/03/1995 | Fuchu | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Onishi, Takao | SP | Rock River Rats | 21 | 03/10/1995 | Sapporo | JPN | Right | Right | 5' 9" | 215 lbs | - |
| Onishi, Yasukazu | LF | Riverside Red Bulls | 20 | 07/22/1996 | Suzuka | JPN | Right | Right | 6' 3" | 185 lbs | - |
| Ortíz, Adrián | 3B | Long Island Ducks | 23 | 11/02/1993 | Newport Beach | USA | Right | Right | 6' 2" | 215 lbs | - |
| Ortíz, Ernesto | MR | San Antonio Storm Troopers | 27 | 04/19/1989 | Rogers | USA | Right | Right | 6' 7" | 214 lbs | - |
| Ortíz, Félix | CL | Anniston Cougars | 23 | 05/15/1993 | New York | USA | Left | Left | 6' 2" | 200 lbs | - |
| Ortíz, José | MR | Prussian Marxists | 27 | 08/10/1989 | Maracaibo | VEN | Right | Left | 6' 2" | 213 lbs | - |
| Ortíz, Pedro | MR | Anniston Cougars | 24 | 11/04/1992 | Calumet City | USA | Left | Left | 5' 9" | 188 lbs | - |
| Ortíz, Sergio | SP | Blackpool Gamblers | 22 | 12/11/1994 | Yabucoa | PUR | Left | Left | 5' 11" | 260 lbs | - |
| Orton, Conrad | MR | Madison Beehive | 21 | 03/25/1995 | Ottawa | CAN | Right | Right | 6' 0" | 225 lbs | - |
| Osborn, Dave | LF | Murfreesboro Deacons | 23 | 01/14/1993 | Fabens | USA | Left | Left | 6' 0" | 180 lbs | - |
| Oswald, Chris | 3B | Wichita Wolverines | 27 | 09/20/1989 | Plainfield | USA | Right | Right | 6' 0" | 179 lbs | - |
| Otto, Guonçalo | SP | Blackpool Gamblers | 21 | 07/08/1995 | Valle de la Pascua | VEN | Right | Right | 6' 2" | 225 lbs | - |
| Owens, Jacob | MR | Spokane Bulldogs | 23 | 12/14/1993 | Mayflower Village | USA | Left | Left | 6' 1" | 225 lbs | - |
| Owens, Keith | MR | Free Agent | 30 | 12/29/1986 | West Peoria | USA | Switch | Right | 6' 1" | 193 lbs | - |
| Oyama, Kata | CF | Lake of the Isles Wolves | 25 | 08/06/1991 | Kisogawa | JPN | Left | Right | 6' 1" | 160 lbs | - |
