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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dewitt O'Brien | 2056-2056 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Nick O'Herlihy | 2025-2029 | .000 | 0 | 0 | 5 | 6 | 4 | 3.16 | 52 |
| Lucas O'Higgins | 2025-2025 | .059 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Neil | 2025-2027 | .253 | 10 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ocampo | 2040-2045 | .207 | 5 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Freddy Ocasio | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Florian Odenthal | 2028-2028 | .000 | 0 | 0 | 11 | 6 | 2 | 2.86 | 110 |
| Carlino Odescalchi | 2027-2039 | .000 | 0 | 0 | 74 | 57 | 10 | 3.46 | 819 |
| Raimondo Odilo | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 1 | 5.40 | 2 |
| Garm Oerlemans | 2025-2028 | .000 | 0 | 0 | 13 | 10 | 35 | 2.75 | 227 |
| Toin Ogawa | 2025-2033 | .000 | 0 | 0 | 7 | 10 | 4 | 3.90 | 235 |
| Kyung-soo Oh | 2028-2028 | .277 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Sul-shik Oh | 2025-2029 | .234 | 13 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Taheiji Ohara | 2025-2026 | .153 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Sascha Ohrenstiel | 2025-2036 | .000 | 0 | 0 | 12 | 5 | 5 | 3.20 | 171 |
| Manuel Ojeda | 2056-2056 | .266 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ojeda | 2035-2035 | .000 | 0 | 0 | 4 | 5 | 1 | 4.80 | 49 |
| Manabu Ojima | 2053-2056 | .240 | 10 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Hiroya Okada | 2040-2052 | .000 | 0 | 0 | 81 | 62 | 52 | 2.62 | 1568 |
| Jiro Okamoto | 2036-2040 | .106 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Katsunan Okamoto | 2033-2033 | .000 | 0 | 0 | 1 | 0 | 0 | 1.86 | 27 |
| Tanyu Okubo | 2051-2052 | .178 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oldford | 2048-2048 | .314 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Oliphant | 2054-2056 | .223 | 9 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Salvador Oliva | 2025-2026 | .167 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Winn Olive | 2056-2056 | .000 | 0 | 0 | 2 | 1 | 0 | 1.33 | 20 |
| Lester Oliver | 2029-2031 | .211 | 5 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Olsen | 2040-2041 | .174 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Burton Olson | 2056-2056 | .242 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Jurrie Olthuis | 2032-2037 | .265 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Seung-hyeon Om | 2047-2049 | .252 | 6 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Yeom Om | 2048-2054 | .213 | 46 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Omoboni | 2028-2037 | .267 | 40 | 195 | 0 | 0 | 0 | 0.00 | 0 |
| Marcelino Omoboni | 2051-2056 | .208 | 80 | 171 | 0 | 0 | 0 | 0.00 | 0 |
| Iemochi Ono | 2029-2046 | .288 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Hubert Onorati | 2040-2044 | .180 | 6 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Saverio Onorati | 2041-2045 | .198 | 17 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Etienne Oort | 2025-2030 | .214 | 12 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Jop Oostenbroek | 2030-2033 | .195 | 2 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Ezio Orati | 2032-2035 | .000 | 0 | 0 | 2 | 3 | 0 | 4.64 | 21 |
| Manuel Ordóñez | 2051-2052 | .000 | 0 | 0 | 0 | 4 | 1 | 4.10 | 42 |
| Mauro Orey | 2046-2051 | .169 | 11 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Gustav Orhan | 2046-2052 | .000 | 0 | 0 | 19 | 21 | 23 | 3.38 | 247 |
| Gennarino Ori | 2031-2031 | .255 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Sixto Orido | 2029-2031 | .226 | 26 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Giandonato Oristano | 2043-2043 | .000 | 0 | 0 | 0 | 1 | 0 | 4.50 | 3 |
| Antonino Orlando | 2042-2051 | .187 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Orlando | 2053-2055 | .000 | 0 | 0 | 10 | 11 | 2 | 2.70 | 163 |
| Carlos Orosco | 2053-2056 | .194 | 7 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Orozco | 2048-2052 | .000 | 0 | 0 | 13 | 12 | 16 | 2.02 | 247 |
| Mariano Orozco | 2025-2025 | .326 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2042-2042 | .000 | 0 | 0 | 10 | 11 | 0 | 2.51 | 183 |
| Ricardo Orozco | 2054-2054 | .000 | 0 | 0 | 3 | 2 | 0 | 2.17 | 94 |
| Tony Orpin | 2045-2045 | .000 | 0 | 0 | 3 | 13 | 0 | 3.28 | 99 |
| Fortunato Orsi | 2050-2051 | .235 | 17 | 44 | 8 | 2 | 1 | 2.36 | 67 |
| Galtero Orsi | 2031-2034 | .000 | 0 | 0 | 1 | 3 | 0 | 4.22 | 27 |
| Armando Ortega | 2025-2025 | .167 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortega | 2032-2032 | .000 | 0 | 0 | 0 | 2 | 0 | 9.64 | 4 |
| José Ortega | 2046-2049 | .200 | 14 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortega | 2025-2025 | .071 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Orlando Ortega | 2048-2055 | .193 | 20 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortega | 2050-2053 | .000 | 0 | 0 | 15 | 7 | 7 | 2.11 | 223 |
| Alfredo Ortíz | 2033-2047 | .000 | 0 | 0 | 14 | 16 | 3 | 3.39 | 251 |
| Armando Ortíz | 2053-2055 | .000 | 0 | 0 | 17 | 18 | 2 | 3.44 | 270 |
| Cristián Ortíz | 2036-2043 | .222 | 29 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Enrico Ortíz | 2045-2052 | .000 | 0 | 0 | 47 | 34 | 2 | 2.51 | 779 |
| Enrico Ortíz | 2030-2031 | .067 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Ortíz | 2053-2054 | .243 | 7 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Ortíz | 2035-2035 | .000 | 0 | 0 | 2 | 1 | 0 | 1.64 | 15 |
| José Ortíz | 2054-2055 | .000 | 0 | 0 | 6 | 4 | 1 | 2.63 | 144 |
| José Ortíz | 2046-2049 | .000 | 0 | 0 | 1 | 1 | 1 | 7.65 | 21 |
| José Ortíz | 2038-2041 | .265 | 7 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2034-2038 | .193 | 29 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2026-2026 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Ortíz | 2044-2044 | .178 | 9 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2053-2056 | .165 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ortíz | 2025-2028 | .000 | 0 | 0 | 5 | 2 | 3 | 3.68 | 98 |
| Ricardo Ortíz | 2034-2037 | .000 | 0 | 0 | 12 | 12 | 0 | 3.18 | 150 |
| Santiago Ortíz | 2028-2030 | .180 | 0 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Tomás Ortíz | 2035-2035 | .000 | 0 | 0 | 4 | 3 | 1 | 3.42 | 53 |
| Vicente Ortíz | 2031-2033 | .143 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Lucas Osbert | 2052-2052 | .000 | 0 | 0 | 7 | 6 | 0 | 1.88 | 98 |
| Spagorl Oshin | 2025-2028 | .223 | 11 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Godfried Oster | 2029-2033 | .239 | 18 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Yasutoki Ota | 2040-2045 | .000 | 0 | 0 | 14 | 12 | 19 | 2.41 | 203 |
| Arrighetto Otero | 2044-2045 | .179 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Otero | 2034-2045 | .222 | 5 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| José Otero | 2026-2030 | .191 | 9 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Motoshige Otsuka | 2037-2044 | .253 | 34 | 128 | 0 | 0 | 0 | 16.20 | 1 |
| Neil Outhwaite | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Cliff Overbeek | 2050-2050 | .286 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Stewart Overy | 2026-2027 | .274 | 8 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| António Ovide | 2039-2042 | .238 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Shoji Oyama | 2033-2043 | .000 | 0 | 0 | 2 | 0 | 3 | 0.00 | 21 |
