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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 |
|---|---|---|---|---|---|---|---|---|---|
| Norm O'Brian | 2147-2149 | .091 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Halloran | 2125-2127 | .302 | 5 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Keith O'Malley | 2119-2134 | .334 | 26 | 191 | 0 | 0 | 0 | 0.00 | 0 |
| Brent O'Monahan | 2101-2101 | .154 | 0 | 5 | 15 | 8 | 0 | 2.10 | 153 |
| Tom O'Neill | 2113-2114 | .268 | 20 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent O'Quinn | 2102-2103 | .280 | 27 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Tomulty | 2122-2123 | .221 | 0 | 6 | 18 | 6 | 0 | 2.63 | 243 |
| Wolde-Selassie Oba | 2135-2135 | .203 | 4 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Fasilidas Obanjoko | 2144-2145 | .226 | 9 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Ocampo | 2105-2107 | .043 | 0 | 1 | 8 | 19 | 23 | 4.46 | 155 |
| Pedro Ochoa | 2145-2146 | .226 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Ockey | 2149-2149 | .252 | 14 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Saled Odion | 2130-2130 | .205 | 10 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Stefan Oeggl | 2147-2147 | .272 | 11 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Toshiro Ogawa | 2149-2149 | .204 | 1 | 6 | 7 | 13 | 0 | 2.89 | 130 |
| Srdjan Ogrijenovic | 2149-2149 | .100 | 0 | 0 | 3 | 0 | 0 | 3.66 | 38 |
| Muhuc Ogwambi | 2145-2148 | .249 | 34 | 151 | 0 | 0 | 0 | 0.00 | 0 |
| Man-ho Oh | 2132-2132 | .267 | 9 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Nestor Ohapkin | 2134-2135 | .182 | 13 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Ienobu Ohayashi | 2132-2133 | .342 | 3 | 18 | 1 | 3 | 3 | 2.33 | 93 |
| Okura Ojima | 2147-2148 | .241 | 13 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Norogumi Okamoto | 2148-2149 | .196 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Kassa Ola | 2148-2149 | .171 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Yegor Olhovikov | 2145-2146 | .276 | 8 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Dimas Olival | 2119-2120 | .111 | 0 | 0 | 1 | 1 | 3 | 5.49 | 20 |
| Manuel Olivas | 2113-2113 | .300 | 23 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Oliveira | 2115-2129 | .310 | 13 | 124 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Oliveira | 2104-2104 | .000 | 0 | 0 | 8 | 2 | 2 | 3.34 | 120 |
| Jeff Oliver | 2136-2137 | .290 | 38 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Marcus Oliver | 2124-2126 | .333 | 1 | 73 | 23 | 10 | 0 | 4.01 | 204 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Marçall Olmpio | 2101-2103 | .269 | 0 | 11 | 13 | 9 | 8 | 3.47 | 153 |
| Odd Olsen | 2133-2139 | .285 | 14 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| Kululu Olujimi | 2136-2137 | .237 | 0 | 10 | 22 | 16 | 0 | 3.81 | 265 |
| Alfredo Olvera | 2117-2117 | .226 | 0 | 6 | 9 | 7 | 0 | 2.69 | 154 |
| Ramón Olvera | 2145-2149 | .286 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Olvera | 2148-2148 | .400 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Fath Omar | 2136-2136 | .000 | 0 | 0 | 3 | 3 | 0 | 3.36 | 55 |
| Karolek Omelko | 2113-2113 | .275 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Misa Omeragic | 2149-2149 | .312 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Kunimichi Omori | 2148-2149 | .000 | 0 | 0 | 0 | 2 | 0 | 7.04 | 21 |
| Miguel Ondonez | 2115-2122 | .000 | 0 | 0 | 12 | 9 | 45 | 2.15 | 174 |
| Cisco Ontiveros | 2122-2126 | .276 | 61 | 385 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ontiveros | 2111-2113 | .139 | 0 | 4 | 4 | 8 | 0 | 4.42 | 77 |
| Irving Oort | 2115-2116 | .278 | 8 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Sreten Opacic | 2148-2149 | .333 | 0 | 0 | 0 | 1 | 1 | 3.75 | 20 |
| Runar Opgård | 2140-2141 | .228 | 6 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Angus Opie | 2144-2144 | .258 | 0 | 1 | 6 | 5 | 0 | 3.25 | 71 |
| Fabio Opsteegh | 2133-2135 | .248 | 4 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Reþit Orbay | 2126-2131 | .286 | 0 | 9 | 10 | 0 | 1 | 3.16 | 170 |
| Cristián Ordóñez | 2149-2149 | .280 | 10 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ornelas | 2148-2149 | .261 | 14 | 55 | 0 | 0 | 1 | 4.50 | 10 |
| Héctor Ortega | 2137-2138 | .286 | 12 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Ortega | 2111-2125 | .500 | 0 | 3 | 8 | 2 | 2 | 2.79 | 97 |
| Miguel Ortega | 2149-2149 | .250 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Randall Orton | 2101-2114 | .265 | 10 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2106-2106 | .274 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortíz | 2149-2149 | .000 | 0 | 0 | 0 | 0 | 0 | 6.14 | 22 |
| Héctor Ortíz | 2125-2129 | .232 | 0 | 9 | 8 | 26 | 0 | 6.38 | 128 |
| Jorge Ortíz | 2104-2104 | .435 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2110-2119 | .194 | 0 | 4 | 10 | 3 | 0 | 2.86 | 123 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Ortíz | 2148-2149 | .260 | 6 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ortíz | 2101-2104 | .255 | 11 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortíz | 2147-2149 | .407 | 2 | 8 | 0 | 7 | 0 | 8.09 | 32 |
| Randall Ortíz | 2114-2117 | .258 | 0 | 6 | 11 | 9 | 4 | 4.33 | 247 |
| Sergio Ortíz | 2136-2136 | .249 | 17 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Ortíz | 2104-2104 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ramdas Oruganti | 2139-2139 | .247 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Subhadran Oruganti | 2116-2128 | .267 | 16 | 173 | 0 | 0 | 0 | 0.00 | 0 |
| Lance Osborne | 2123-2123 | .312 | 10 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Zagwe Osei | 2136-2146 | .232 | 14 | 92 | 0 | 1 | 1 | 6.75 | 5 |
| Alfonso Osequedo | 2138-2138 | .364 | 0 | 8 | 11 | 7 | 0 | 4.46 | 122 |
| Matabei Oshima | 2128-2130 | .241 | 29 | 164 | 0 | 0 | 0 | 0.00 | 0 |
| Leon Oskamp | 2148-2149 | .300 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Khaleel Osmani | 2140-2140 | .272 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Peter Ostgerg | 2132-2132 | .215 | 9 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Masashige Ota | 2144-2144 | .167 | 0 | 1 | 11 | 7 | 2 | 2.96 | 118 |
| Fernando Otero | 2117-2117 | .323 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2149-2149 | .143 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Kokaji Ottah | 2143-2144 | .313 | 5 | 32 | 5 | 3 | 2 | 4.02 | 59 |
| Galimberto Ottini | 2143-2143 | .295 | 1 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Yic Ou-yang | 2134-2140 | .302 | 16 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Outhwaite | 2123-2124 | .286 | 9 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oxford | 2117-2119 | .310 | 7 | 62 | 0 | 0 | 0 | 0.00 | 0 |
