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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 | 2108-2112 | .238 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Halloran | 2140-2140 | .294 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Sifaks Ochieng | 2108-2108 | .000 | 0 | 0 | 0 | 0 | 0 | 20.25 | 1 |
| Yujiro Ogura | 2136-2144 | .238 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Chin-seok Oh | 2136-2136 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Man-ho Oh | 2136-2144 | .157 | 4 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Ienobu Ohayashi | 2136-2140 | .000 | 0 | 0 | 0 | 1 | 0 | 7.36 | 9 |
| Kojuro Ohayashi | 2120-2124 | .162 | 2 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Takao Ohayashi | 2136-2144 | .000 | 0 | 0 | 2 | 0 | 3 | 1.77 | 35 |
| Hideki Oka | 2140-2148 | .114 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Sumitomo Okazaki | 2112-2116 | .333 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Seitaro Okubo | 2116-2116 | .211 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Gareth Oldknow | 2124-2124 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dimas Olival | 2124-2136 | .125 | 0 | 0 | 0 | 2 | 0 | 5.40 | 43 |
| José Olivas | 2112-2112 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marcus Oliver | 2136-2136 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Odd Olsen | 2136-2140 | .111 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Rajminder Omarjeet | 2108-2108 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Takiji Ono | 2124-2124 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 6 |
| Angus Opie | 2148-2148 | 1.000 | 0 | 1 | 0 | 0 | 0 | 2.08 | 2 |
| Reþit Orbay | 2120-2120 | .000 | 0 | 0 | 0 | 0 | 0 | 36.00 | 3 |
| Raúl Ordóñez | 2108-2108 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Randall Orton | 2108-2112 | .286 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2108-2116 | .241 | 2 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2108-2116 | .297 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2116-2120 | .333 | 0 | 0 | 1 | 1 | 0 | 9.28 | 16 |
| Vicente Ortíz | 2108-2108 | .421 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ramdas Oruganti | 2140-2144 | .182 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Alfonso Osequedo | 2140-2148 | 1.000 | 0 | 1 | 0 | 1 | 0 | 5.06 | 10 |
| Matabei Oshima | 2136-2144 | .133 | 5 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Khaleel Osmani | 2128-2140 | .210 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Senichi Otsuka | 2108-2112 | 1.000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 6 |
| Galimberto Ottini | 2148-2148 | .200 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Yic Ou-yang | 2140-2140 | .174 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oxford | 2120-2124 | .091 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
