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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ernesto O'Callinghan | 2102-2104 | .302 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Migdônio O'Callinghan | 2104-2107 | .245 | 28 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Steven O'connor | 2144-2144 | .174 | 0 | 4 | 10 | 10 | 0 | 3.28 | 171 |
| Ron O'Halloran | 2127-2128 | .348 | 0 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Brent O'Monahan | 2102-2104 | .395 | 1 | 9 | 17 | 5 | 35 | 1.96 | 169 |
| Lloyd O'Neal | 2104-2104 | .125 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Neill | 2116-2117 | .213 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Neill | 2115-2116 | .271 | 28 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent O'Quinn | 2104-2104 | .284 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Nicky O'Reilly | 2141-2146 | .253 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Tomulty | 2123-2124 | .243 | 0 | 11 | 12 | 9 | 0 | 3.41 | 187 |
| Wolde-Selassie Oba | 2136-2136 | .242 | 12 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Fasilidas Obanjoko | 2146-2146 | .245 | 9 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Ocampo | 2107-2109 | .110 | 0 | 12 | 20 | 18 | 0 | 3.05 | 262 |
| Sifaks Ochieng | 2109-2109 | .429 | 0 | 1 | 4 | 0 | 0 | 4.87 | 46 |
| Mariano Ochoa | 2141-2141 | .037 | 0 | 1 | 5 | 6 | 0 | 2.84 | 75 |
| Kikpurui Odhieng | 2142-2142 | 1.000 | 0 | 0 | 2 | 4 | 0 | 3.06 | 42 |
| Saled Odion | 2131-2131 | .189 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Yujiro Ogura | 2131-2132 | .247 | 27 | 103 | 0 | 0 | 0 | 0.00 | 0 |
| Man-ho Oh | 2133-2133 | .302 | 14 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Seong-hyeon Oh | 2143-2145 | .213 | 14 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Nestor Ohapkin | 2135-2138 | .191 | 31 | 124 | 0 | 0 | 0 | 0.00 | 0 |
| Ienobu Ohayashi | 2134-2141 | .224 | 0 | 13 | 28 | 12 | 0 | 2.27 | 388 |
| Hideki Oka | 2133-2133 | .255 | 9 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Seitaro Okubo | 2111-2118 | .298 | 4 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Shoichi Okubo | 2143-2146 | .159 | 1 | 5 | 5 | 12 | 0 | 5.02 | 127 |
| Madidu Olamina | 2130-2133 | .266 | 0 | 12 | 15 | 15 | 0 | 3.39 | 186 |
| Roger Oldford | 2138-2138 | 1.000 | 0 | 0 | 5 | 10 | 31 | 3.94 | 65 |
| Gareth Oldknow | 2131-2131 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Oliva | 2143-2143 | .000 | 0 | 0 | 1 | 4 | 2 | 4.83 | 44 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Dimas Olival | 2120-2140 | .233 | 0 | 8 | 15 | 21 | 0 | 4.10 | 120 |
| José Olivas | 2112-2112 | .323 | 22 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Olivas | 2114-2121 | .297 | 25 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Oliveira | 2116-2116 | .345 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Oliveira | 2104-2108 | .167 | 0 | 1 | 12 | 27 | 0 | 6.38 | 200 |
| Marçall Olmpio | 2102-2106 | .246 | 0 | 7 | 15 | 9 | 6 | 3.13 | 189 |
| Odd Olsen | 2135-2139 | .256 | 7 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Kululu Olujimi | 2138-2138 | .203 | 0 | 7 | 17 | 5 | 0 | 2.64 | 139 |
| Alfredo Olvera | 2118-2118 | .189 | 1 | 4 | 7 | 10 | 0 | 4.09 | 123 |
| Ramón Olvera | 2146-2146 | .220 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Amente Omar | 2133-2133 | .256 | 24 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Fath Omar | 2137-2140 | .097 | 0 | 12 | 39 | 38 | 0 | 3.17 | 541 |
| Masgaba Omariba | 2146-2146 | .179 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Karolek Omelko | 2111-2113 | .254 | 45 | 166 | 0 | 0 | 0 | 0.00 | 0 |
| Tekeste Omitra | 2144-2145 | .500 | 0 | 0 | 5 | 2 | 1 | 3.49 | 67 |
| Miguel Ondonez | 2115-2116 | .000 | 0 | 0 | 3 | 9 | 52 | 3.08 | 127 |
| Subaru Ono | 2144-2146 | .228 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Cisco Ontiveros | 2127-2127 | .280 | 17 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| Irving Oort | 2116-2116 | .244 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Runar Opgård | 2140-2143 | .205 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Angus Opie | 2145-2145 | .140 | 0 | 1 | 8 | 9 | 0 | 2.97 | 102 |
| Fabio Opsteegh | 2142-2142 | .345 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Reþit Orbay | 2124-2131 | .143 | 0 | 6 | 17 | 10 | 6 | 2.71 | 386 |
| Isko Orpilla | 2130-2130 | .029 | 0 | 0 | 3 | 15 | 0 | 7.24 | 34 |
| Héctor Ortega | 2139-2139 | .301 | 25 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Ortega | 2119-2124 | .286 | 0 | 3 | 7 | 14 | 57 | 2.49 | 113 |
| Randall Orton | 2101-2113 | .298 | 20 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2107-2107 | .265 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortíz | 2144-2146 | .302 | 1 | 10 | 19 | 21 | 3 | 2.95 | 285 |
| Héctor Ortíz | 2129-2135 | .150 | 0 | 4 | 13 | 13 | 9 | 4.06 | 212 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jorge Ortíz | 2104-2118 | .316 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2111-2119 | .209 | 0 | 4 | 16 | 11 | 6 | 3.60 | 287 |
| Manuel Ortíz | 2100-2105 | .240 | 17 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Ortíz | 2142-2146 | .184 | 5 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Rubén Ortíz | 2103-2108 | .259 | 18 | 127 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Ortíz | 2104-2104 | .308 | 0 | 3 | 2 | 1 | 2 | 3.20 | 0 |
| Subhadran Oruganti | 2117-2125 | .270 | 14 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Lance Osborne | 2124-2124 | .292 | 6 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Zagwe Osei | 2142-2145 | .255 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Alfonso Osequedo | 2139-2139 | .254 | 0 | 5 | 12 | 7 | 0 | 2.79 | 150 |
| Peter Ostgerg | 2133-2136 | .283 | 42 | 224 | 0 | 0 | 0 | 0.00 | 0 |
| Masashige Ota | 2145-2146 | .176 | 0 | 3 | 9 | 8 | 2 | 1.70 | 189 |
| Fernando Otero | 2118-2118 | .319 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Senichi Otsuka | 2110-2110 | .000 | 0 | 0 | 0 | 0 | 3 | 0.87 | 5 |
| Kokaji Ottah | 2145-2146 | .284 | 12 | 70 | 5 | 3 | 1 | 1.71 | 54 |
| Galimberto Ottini | 2144-2144 | .285 | 4 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Yic Ou-yang | 2135-2139 | .254 | 8 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Outhwaite | 2125-2125 | .283 | 3 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Lucas Overy | 2144-2146 | .000 | 0 | 0 | 9 | 5 | 10 | 1.97 | 119 |
| Mark Owen | 2103-2103 | .229 | 4 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oxford | 2118-2128 | .284 | 12 | 86 | 0 | 0 | 0 | 0.00 | 0 |
