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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Craig O'Farrell | 2110-2110 | .265 | 8 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Keith O'Malley | 2127-2129 | .327 | 13 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent O'Quinn | 2111-2113 | .235 | 34 | 183 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Tomulty | 2126-2127 | .204 | 1 | 3 | 12 | 21 | 0 | 2.86 | 278 |
| Enrique Ocampo | 2113-2117 | .051 | 0 | 1 | 10 | 12 | 0 | 3.86 | 140 |
| Sifaks Ochieng | 2109-2109 | .500 | 0 | 1 | 1 | 0 | 0 | 5.40 | 4 |
| Bezzi Ogwambi | 2114-2122 | .268 | 35 | 200 | 0 | 0 | 0 | 0.00 | 0 |
| Chin-seok Oh | 2125-2128 | .279 | 13 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Eiji Ohashi | 2101-2104 | .243 | 9 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Ohayashi | 2100-2110 | .240 | 12 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Kisho Ohayashi | 2124-2129 | .175 | 1 | 9 | 24 | 36 | 23 | 3.22 | 334 |
| Kojuro Ohayashi | 2120-2129 | .257 | 29 | 178 | 0 | 0 | 0 | 0.00 | 0 |
| Takafumi Ohayashi | 2102-2104 | .245 | 0 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Takao Ohayashi | 2126-2129 | .250 | 0 | 0 | 10 | 5 | 31 | 2.84 | 131 |
| Vsevolod Ohlupin | 2100-2104 | .245 | 26 | 121 | 0 | 0 | 0 | 0.00 | 0 |
| Hagos Ojwang | 2105-2115 | .332 | 65 | 393 | 0 | 0 | 0 | 17.18 | 1 |
| Masazumi Okamoto | 2102-2102 | .276 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Sumitomo Okazaki | 2110-2119 | .268 | 48 | 258 | 0 | 0 | 0 | 0.00 | 0 |
| Dejenie Okoth | 2100-2105 | .307 | 37 | 243 | 0 | 0 | 0 | 0.00 | 0 |
| Said Okoth | 2108-2110 | .239 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Gareth Oldknow | 2122-2129 | .229 | 10 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| José Olivas | 2107-2111 | .288 | 68 | 268 | 0 | 0 | 0 | 0.00 | 0 |
| Amente Omar | 2125-2128 | .238 | 38 | 127 | 0 | 0 | 0 | 0.00 | 0 |
| Rajminder Omarjeet | 2103-2110 | .291 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Wole Omaswa | 2102-2109 | .269 | 39 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| Nader Omotunde | 2100-2107 | .244 | 56 | 263 | 0 | 0 | 0 | 0.00 | 0 |
| Bayani Ong | 2122-2127 | .217 | 6 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Takiji Ono | 2121-2122 | .000 | 0 | 0 | 6 | 8 | 45 | 3.31 | 101 |
| Yoshihide Ono | 2100-2103 | .223 | 34 | 127 | 0 | 0 | 0 | 0.00 | 0 |
| Cisco Ontiveros | 2129-2129 | .278 | 22 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pedro Ontiveros | 2114-2121 | .184 | 0 | 9 | 43 | 51 | 25 | 4.08 | 426 |
| Reþit Orbay | 2117-2123 | .137 | 0 | 5 | 19 | 10 | 4 | 3.00 | 295 |
| Raúl Ordóñez | 2104-2108 | .000 | 0 | 0 | 11 | 4 | 38 | 4.09 | 172 |
| Galip Orga | 2104-2104 | .000 | 0 | 0 | 2 | 0 | 19 | 0.00 | 28 |
| Bartolomeo Orlandi | 2129-2129 | .111 | 0 | 0 | 2 | 3 | 0 | 4.18 | 48 |
| Mauro Ortega | 2122-2122 | .000 | 0 | 0 | 1 | 2 | 0 | 9.75 | 27 |
| Andrés Ortíz | 2118-2119 | .061 | 0 | 4 | 8 | 11 | 2 | 3.37 | 185 |
| Carlos Ortíz | 2112-2116 | .256 | 36 | 151 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2114-2114 | .254 | 2 | 5 | 7 | 12 | 0 | 3.79 | 67 |
| Percy Oskam | 2106-2110 | .211 | 15 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Khaleel Osmani | 2121-2125 | .293 | 9 | 153 | 0 | 0 | 0 | 0.00 | 0 |
| Seika Otani | 2100-2103 | .083 | 0 | 2 | 9 | 8 | 0 | 3.09 | 153 |
| Senichi Otsuka | 2100-2108 | .111 | 0 | 4 | 19 | 15 | 11 | 2.97 | 231 |
| Duridar Ottah | 2106-2110 | .000 | 0 | 0 | 13 | 19 | 29 | 2.97 | 209 |
| Matt Ottenhof | 2113-2116 | .250 | 35 | 190 | 0 | 0 | 0 | 0.00 | 0 |
| Ibrahim Ouaziz | 2105-2112 | .156 | 0 | 3 | 22 | 33 | 43 | 6.01 | 344 |
| Tom Oxford | 2124-2124 | .236 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
