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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 |
|---|---|---|---|---|---|---|---|---|---|
| Casey O'Finan | 2146-2152 | .000 | 0 | 0 | 2 | 1 | 4 | 0.89 | 23 |
| Ron O'Halloran | 2130-2133 | .273 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Wolde-Selassie Oba | 2139-2145 | .200 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Masnsen Obadele | 2153-2153 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ocampo | 2143-2146 | .000 | 0 | 0 | 0 | 1 | 1 | 2.25 | 8 |
| Corazon Ocaya | 2154-2154 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 1 |
| Mariano Ochoa | 2141-2151 | .250 | 0 | 0 | 2 | 4 | 0 | 6.45 | 42 |
| Stefan Oeggl | 2149-2150 | .182 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Yujiro Ogura | 2134-2138 | .217 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Chin-seok Oh | 2126-2132 | .100 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Man-ho Oh | 2138-2146 | .071 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nestor Ohapkin | 2142-2142 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kojuro Ohayashi | 2129-2129 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Takao Ohayashi | 2127-2135 | .000 | 0 | 0 | 1 | 1 | 1 | 5.23 | 13 |
| Hideki Oka | 2137-2145 | .171 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Susumu Okamoto | 2153-2154 | .000 | 0 | 0 | 1 | 0 | 0 | 2.25 | 10 |
| Madidu Olamina | 2131-2131 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Roger Oldford | 2140-2152 | .000 | 0 | 0 | 1 | 1 | 0 | 6.97 | 9 |
| Dimas Olival | 2127-2133 | .000 | 0 | 0 | 1 | 0 | 0 | 1.00 | 5 |
| Carlos Oliveira | 2126-2126 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Oliver | 2145-2145 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marcus Oliver | 2129-2131 | .417 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Kululu Olujimi | 2146-2148 | .000 | 0 | 0 | 0 | 0 | 0 | 2.16 | 7 |
| Amente Omar | 2127-2127 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Misa Omeragic | 2152-2154 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Takiji Ono | 2125-2132 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 4 |
| Cisco Ontiveros | 2131-2132 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Runar Opgård | 2144-2144 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bartolomeo Orlandi | 2133-2135 | .500 | 0 | 0 | 0 | 0 | 0 | 1.08 | 10 |
| Ramón Ornelas | 2152-2154 | .267 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Isko Orpilla | 2134-2140 | .000 | 0 | 0 | 0 | 2 | 0 | 3.32 | 22 |
| Ken Osborn | 2153-2154 | .412 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Lance Osborne | 2127-2132 | .077 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alfonso Osequedo | 2147-2147 | 1.000 | 0 | 1 | 0 | 0 | 0 | 5.79 | 5 |
| Matabei Oshima | 2134-2143 | .167 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Khaleel Osmani | 2126-2139 | .200 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Kokaji Ottah | 2148-2153 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Galimberto Ottini | 2148-2153 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kateb Ouko | 2154-2154 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Ron Outhwaite | 2128-2131 | .263 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
