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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 |
|---|---|---|---|---|---|---|---|---|---|
| Tim O'Brian | 2037-2041 | .288 | 19 | 158 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie O'Bryan | 2018-2028 | .261 | 15 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2031-2031 | .147 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2018-2018 | .297 | 15 | 49 | 0 | 1 | 0 | 67.50 | 2 |
| Greg O'Day | 2047-2047 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Greg O'Day | 2038-2038 | .000 | 0 | 0 | 0 | 0 | 0 | 3.00 | 12 |
| Rickey O'Day | 2042-2044 | .000 | 0 | 0 | 3 | 2 | 0 | 5.61 | 56 |
| Alex O'Dell | 2044-2044 | .000 | 0 | 0 | 1 | 0 | 0 | 7.82 | 12 |
| Christian O'Dell | 2019-2023 | .263 | 29 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Bailey O'Donnell | 2047-2049 | .000 | 0 | 0 | 5 | 2 | 0 | 4.14 | 97 |
| Steve O'Fennaghty | 2042-2046 | .000 | 0 | 0 | 3 | 2 | 0 | 5.79 | 58 |
| Jimmy O'Flahavan | 2029-2036 | .000 | 0 | 0 | 8 | 10 | 0 | 4.25 | 149 |
| Bill O'Halloran | 2044-2046 | .203 | 7 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor O'Herlihy | 2028-2034 | .295 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Warren O'Herlihy | 2017-2017 | .285 | 14 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent O'Higgin | 2032-2035 | .000 | 0 | 0 | 11 | 6 | 0 | 4.78 | 121 |
| Bobby O'Kennedy | 2044-2044 | .107 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2016-2019 | .000 | 0 | 0 | 3 | 5 | 2 | 5.37 | 125 |
| Christian O'Neal | 2017-2023 | .283 | 11 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence O'Neal | 2045-2045 | .370 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Neal | 2037-2039 | .273 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neil | 2038-2038 | .200 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2017-2022 | .000 | 0 | 0 | 4 | 3 | 0 | 4.48 | 40 |
| Eric O'Neill | 2022-2027 | .256 | 4 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Reilly | 2040-2040 | .000 | 0 | 0 | 2 | 1 | 3 | 3.46 | 21 |
| Jason O'Rourke | 2050-2050 | .000 | 0 | 0 | 4 | 5 | 0 | 3.53 | 52 |
| Ron O'Slattery | 2022-2024 | .000 | 0 | 0 | 3 | 5 | 0 | 4.19 | 26 |
| Will O'Slattery | 2026-2035 | .000 | 0 | 0 | 3 | 5 | 13 | 4.09 | 93 |
| Jake O'Tomalty | 2028-2028 | .000 | 0 | 0 | 2 | 1 | 0 | 4.05 | 7 |
| Ricky O'Toole | 2033-2033 | .000 | 0 | 0 | 4 | 4 | 14 | 3.26 | 21 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Alin Oanta | 2020-2027 | .000 | 0 | 0 | 46 | 28 | 0 | 3.61 | 646 |
| Goodluck Obasanjo | 2029-2039 | .000 | 0 | 0 | 12 | 14 | 0 | 4.32 | 170 |
| Octávio Obezo | 2044-2050 | .280 | 11 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Marvello Obra | 2038-2039 | .296 | 26 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Ocasio | 2034-2046 | .280 | 10 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ocegueda | 2032-2032 | .000 | 0 | 0 | 2 | 1 | 1 | 2.25 | 21 |
| Jorge Ochoa | 2035-2037 | .000 | 0 | 0 | 6 | 3 | 4 | 4.71 | 71 |
| Hirohisa Ogasawara | 2036-2036 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Torajiro Ogawa | 2039-2039 | .324 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Floyd Oglethorpe | 2015-2016 | .000 | 0 | 0 | 5 | 13 | 0 | 7.70 | 119 |
| Jeff Oglethorpe | 2037-2039 | .161 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Munemori Ohara | 2019-2027 | .303 | 11 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Hiroshige Ohashi | 2041-2045 | .263 | 8 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuhiko Ohayashi | 2043-2045 | .218 | 8 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Sakutaro Ohayashi | 2036-2040 | .000 | 0 | 0 | 6 | 4 | 0 | 4.30 | 71 |
| Shigenobu Ohayashi | 2031-2032 | .321 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2022-2031 | .000 | 0 | 0 | 10 | 15 | 1 | 5.14 | 126 |
| Ricardo Ojíto | 2042-2043 | .298 | 6 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Takeo Okamoto | 2048-2048 | .182 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Hidekazu Okawa | 2034-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gavin Okel | 2045-2045 | .318 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Idowu Okonjo | 2034-2034 | .000 | 0 | 0 | 2 | 1 | 0 | 2.95 | 22 |
| Kimi Okubo | 2047-2047 | .222 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Oldenkamp | 2033-2035 | .000 | 0 | 0 | 3 | 7 | 1 | 5.45 | 58 |
| Juan Oleastro | 2043-2047 | .294 | 21 | 121 | 0 | 0 | 0 | 0.00 | 0 |
| Tonny Olieman | 2050-2050 | .216 | 5 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oliva | 2036-2036 | .111 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Richello Oliva | 2043-2043 | .205 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Olivares | 2020-2020 | .288 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2015-2021 | .327 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Richard Ollivier | 2015-2021 | .333 | 28 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Marc Olsen | 2042-2046 | .000 | 0 | 0 | 11 | 6 | 6 | 3.29 | 135 |
| Dan Olson | 2045-2045 | .186 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Emil Olsson | 2035-2035 | .000 | 0 | 0 | 0 | 0 | 0 | 1.17 | 14 |
| Gerold Olthof | 2045-2045 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Mike Ontiveros | 2022-2022 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Octávio Ontiveros | 2034-2035 | .232 | 4 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Anthon Oort | 2040-2040 | .295 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Oostermeer | 2035-2037 | .267 | 21 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Dylan Oram | 2042-2045 | .236 | 1 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordóñez | 2028-2033 | .000 | 0 | 0 | 7 | 11 | 0 | 4.37 | 60 |
| Gerald Orlebar | 2049-2049 | .000 | 0 | 0 | 1 | 2 | 0 | 5.11 | 19 |
| Sasha Orlovsky | 2043-2043 | .269 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2030-2032 | .221 | 7 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| António Orozco | 2047-2047 | .225 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2018-2029 | .279 | 19 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2025-2026 | .256 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2044-2044 | .000 | 0 | 0 | 0 | 2 | 5 | 2.29 | 16 |
| Carlos Ortega | 2023-2025 | .316 | 16 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Claudio Ortega | 2045-2045 | .000 | 0 | 0 | 3 | 3 | 1 | 2.80 | 64 |
| Eduardo Ortega | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 7.36 | 7 |
| Francisco Ortega | 2018-2028 | .310 | 15 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2040-2041 | .218 | 8 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2023-2027 | .225 | 3 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortega | 2035-2035 | .217 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2017 | .000 | 0 | 0 | 1 | 7 | 21 | 4.98 | 39 |
| António Ortíz | 2032-2032 | .188 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortíz | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 7.71 | 1 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Aurelio Ortíz | 2040-2040 | .000 | 0 | 0 | 1 | 6 | 0 | 5.01 | 62 |
| Carlos Ortíz | 2022-2022 | .000 | 0 | 0 | 4 | 8 | 0 | 8.28 | 45 |
| Emílio Ortíz | 2020-2022 | .268 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Ortíz | 2049-2049 | .250 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2039-2042 | .273 | 3 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2028-2035 | .267 | 7 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2031-2038 | .000 | 0 | 0 | 1 | 6 | 3 | 5.70 | 61 |
| José Ortíz | 2025-2029 | .000 | 0 | 0 | 2 | 0 | 5 | 2.70 | 23 |
| Luis Ortíz | 2043-2048 | .308 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2025-2032 | .000 | 0 | 0 | 9 | 15 | 0 | 5.08 | 136 |
| Luis Ortíz | 2016-2016 | .000 | 0 | 0 | 3 | 0 | 1 | 7.99 | 24 |
| Manuel Ortíz | 2047-2049 | .285 | 25 | 137 | 0 | 0 | 0 | 0.00 | 0 |
| Martin Ortíz | 2026-2035 | .000 | 0 | 0 | 10 | 17 | 5 | 4.51 | 136 |
| Octávio Ortíz | 2050-2050 | .000 | 0 | 0 | 0 | 1 | 1 | 3.86 | 1 |
| Pedro Ortíz | 2037-2037 | .194 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Ortíz | 2033-2034 | .279 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ortíz | 2020-2028 | .000 | 0 | 0 | 11 | 19 | 0 | 4.61 | 216 |
| Vincente Ortíz | 2032-2033 | .000 | 0 | 0 | 4 | 3 | 1 | 3.55 | 49 |
| Álex Ortíz | 2042-2042 | .000 | 0 | 0 | 1 | 0 | 1 | 4.91 | 27 |
| Richard Osborn | 2037-2040 | .000 | 0 | 0 | 9 | 7 | 3 | 3.70 | 204 |
| Andrew Osborne | 2017-2017 | .000 | 0 | 0 | 1 | 3 | 0 | 7.47 | 34 |
| Francis Osborne | 2040-2041 | .231 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Gus Osborne | 2035-2036 | .000 | 0 | 0 | 2 | 1 | 1 | 3.22 | 23 |
| Ken Osborne | 2015-2027 | .298 | 6 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Stanley Osborne | 2049-2049 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 3 |
| Carel Oskamp | 2042-2042 | .247 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Osorio | 2029-2034 | .230 | 1 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2035-2035 | .200 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Alfred Osuch | 2037-2037 | .000 | 0 | 0 | 5 | 5 | 0 | 6.33 | 48 |
| Tsugahara Ota | 2041-2041 | .000 | 0 | 0 | 1 | 0 | 0 | 2.38 | 18 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Shohei Otani | 2036-2040 | .300 | 9 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2029-2033 | .000 | 0 | 0 | 9 | 7 | 1 | 3.62 | 135 |
| Jorge Otero | 2030-2030 | .000 | 0 | 0 | 2 | 0 | 0 | 1.46 | 10 |
| Habib Othman | 2043-2050 | .278 | 17 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Yajirobei Otomo | 2026-2027 | .000 | 0 | 0 | 4 | 2 | 32 | 3.15 | 66 |
| Jasper Otto | 2028-2028 | .217 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Zhi-jun Ou-yang | 2048-2049 | .276 | 4 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Bastien Oudin | 2049-2050 | .263 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2021-2033 | .000 | 0 | 0 | 3 | 4 | 0 | 6.38 | 57 |
| Matt Ouweneel | 2034-2034 | .545 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| DeMarvion Overshown | 2043-2046 | .303 | 36 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Craig Overton | 2050-2050 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Giel Overwater | 2035-2036 | .000 | 0 | 0 | 2 | 3 | 0 | 4.06 | 31 |
| Herman Overwater | 2048-2050 | .000 | 0 | 0 | 8 | 5 | 2 | 3.72 | 108 |
| Doug Owen | 2050-2050 | .000 | 0 | 0 | 4 | 0 | 7 | 1.24 | 63 |
| Mike Owens | 2025-2026 | .000 | 0 | 0 | 10 | 9 | 0 | 3.06 | 114 |
| Nolan Owens | 2044-2044 | .000 | 0 | 0 | 2 | 0 | 0 | 3.86 | 1 |
| Tim Owens | 2038-2049 | .000 | 0 | 0 | 13 | 5 | 0 | 4.91 | 88 |
| Jorge Oyas | 2039-2043 | .000 | 0 | 0 | 7 | 7 | 0 | 4.00 | 118 |
| Kyuichi Ozawa | 2044-2045 | .000 | 0 | 0 | 3 | 5 | 3 | 3.93 | 45 |
| Jorge Ozezera | 2044-2044 | .281 | 5 | 13 | 0 | 0 | 0 | 0.00 | 0 |
