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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jonathan O'Brien | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 6.89 | 14 |
| Steve O'Carry | 2037-2043 | .000 | 0 | 0 | 37 | 37 | 2 | 5.46 | 532 |
| Brandon O'Connor | 2028-2040 | .245 | 160 | 514 | 0 | 0 | 0 | 0.00 | 0 |
| Charlie O'Connor | 2018-2021 | .282 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny O'Creagh | 2037-2040 | .000 | 0 | 0 | 5 | 4 | 5 | 9.66 | 55 |
| Jerry O'Donnell | 2019-2019 | .259 | 21 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Donnell | 2024-2025 | .000 | 0 | 0 | 4 | 5 | 0 | 7.56 | 58 |
| David O'Farrell | 2014-2017 | .283 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Ferrall | 2030-2032 | .299 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Andre O'Grotty | 2020-2023 | .000 | 0 | 0 | 35 | 20 | 0 | 4.89 | 348 |
| Jimmy O'Halloran | 2024-2026 | .000 | 0 | 0 | 11 | 17 | 3 | 6.82 | 263 |
| Todd O'Herlihy | 2033-2037 | .000 | 0 | 0 | 15 | 23 | 29 | 6.27 | 340 |
| Tim O'Higgins | 2019-2020 | .250 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Keefe | 2015-2022 | .336 | 99 | 487 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Lehan | 2017-2020 | .210 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Jon O'Loughlin | 2032-2032 | .267 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Quinn | 2017-2020 | .314 | 6 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Millard O'Rorke | 2025-2035 | .000 | 0 | 0 | 64 | 52 | 3 | 4.96 | 830 |
| Mike O'Tracy | 2043-2043 | .000 | 0 | 0 | 5 | 3 | 7 | 4.59 | 79 |
| Nicholas Oakden | 2029-2034 | .000 | 0 | 0 | 5 | 3 | 1 | 5.71 | 103 |
| António Ocampo | 2032-2036 | .000 | 0 | 0 | 27 | 29 | 0 | 6.37 | 295 |
| Juan Ocampo | 2032-2037 | .302 | 17 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ocasio | 2023-2026 | .000 | 0 | 0 | 13 | 14 | 2 | 6.53 | 272 |
| Andrés Ochoa | 2017-2021 | .246 | 8 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Terence Odgers | 2025-2026 | .249 | 11 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Ichiyo Ogawa | 2019-2022 | .000 | 0 | 0 | 17 | 14 | 32 | 7.48 | 110 |
| Kanko Ohayashi | 2038-2041 | .290 | 44 | 204 | 0 | 0 | 0 | 0.00 | 0 |
| Masato Ohayashi | 2043-2043 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Michihiro Ohayashi | 2036-2037 | .000 | 0 | 0 | 3 | 9 | 37 | 3.92 | 53 |
| Nariaki Ohayashi | 2030-2030 | .000 | 0 | 0 | 0 | 1 | 1 | 4.56 | 28 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Henry Ohler | 2037-2037 | .230 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Rodney Ohler | 2028-2028 | .246 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Kazuhiro Oike | 2029-2030 | .000 | 0 | 0 | 6 | 6 | 22 | 5.52 | 82 |
| Hikaru Okabe | 2015-2015 | .000 | 0 | 0 | 3 | 4 | 0 | 6.17 | 23 |
| Kosami Okada | 2017-2018 | .263 | 4 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Matsuyo Okada | 2034-2034 | .206 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Kantaro Okamura | 2030-2031 | .255 | 4 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Kanzaburo Okawa | 2018-2019 | .237 | 36 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshiaga Okumura | 2037-2037 | .413 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuhito Okuta | 2041-2041 | .240 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Xavier Oliva | 2024-2026 | .000 | 0 | 0 | 15 | 18 | 0 | 5.84 | 295 |
| José Olivas | 2018-2022 | .345 | 42 | 219 | 0 | 0 | 0 | 27.00 | 0 |
| Al Oliver | 2024-2024 | .000 | 0 | 0 | 2 | 7 | 0 | 6.77 | 74 |
| Phil Oliver | 2030-2033 | .000 | 0 | 0 | 6 | 7 | 10 | 6.22 | 119 |
| Tom Oliver | 2042-2043 | .273 | 41 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oliver | 2034-2035 | .300 | 25 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Bernardo Olivo | 2037-2037 | .000 | 0 | 0 | 2 | 4 | 1 | 7.81 | 40 |
| Simeone Omoboni | 2027-2027 | .000 | 0 | 0 | 3 | 2 | 0 | 11.77 | 19 |
| Kenji Ono | 2022-2027 | .250 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Masayoshi Ono | 2042-2043 | .280 | 29 | 112 | 0 | 0 | 0 | 0.00 | 0 |
| Dario Onorati | 2014-2018 | .300 | 26 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Lance Oprel | 2041-2041 | .444 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Costantino Oristano | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Iestyn Ormerod | 2040-2041 | .273 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ornelas | 2023-2027 | .269 | 19 | 89 | 0 | 0 | 0 | 21.60 | 0 |
| Jesús Orozco | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 6 |
| Félix Ortega | 2031-2041 | .326 | 15 | 103 | 0 | 0 | 0 | 20.25 | 0 |
| Ignacio Ortega | 2043-2043 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2018-2022 | .000 | 0 | 0 | 20 | 25 | 1 | 7.00 | 328 |
| José Ortega | 2022-2026 | .272 | 27 | 159 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pablo Ortega | 2031-2041 | .339 | 11 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortega | 2042-2043 | .000 | 0 | 0 | 2 | 3 | 4 | 5.91 | 71 |
| Giacomo Ortelli | 2021-2024 | .256 | 60 | 254 | 0 | 0 | 0 | 0.00 | 0 |
| Ángel Ortíz | 2014-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2036-2036 | .305 | 11 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortíz | 2014-2014 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Ortíz | 2034-2040 | .310 | 73 | 321 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2039-2039 | .000 | 0 | 0 | 0 | 0 | 1 | 6.23 | 6 |
| José Ortíz | 2015-2018 | .259 | 14 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Orton | 2039-2042 | .000 | 0 | 0 | 9 | 9 | 4 | 6.47 | 110 |
| Jarrod Osborne | 2032-2036 | .000 | 0 | 0 | 7 | 13 | 1 | 6.37 | 91 |
| Tadakuni Oshima | 2042-2042 | .000 | 0 | 0 | 1 | 1 | 0 | 5.82 | 18 |
| Ricardo Osorio | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 7.71 | 0 |
| Vincente Osorio | 2037-2040 | .000 | 0 | 0 | 10 | 16 | 4 | 6.19 | 155 |
| Kuniyuki Ota | 2018-2021 | .328 | 4 | 36 | 0 | 0 | 0 | 102.60 | 0 |
| Rikiya Ota | 2031-2034 | .000 | 0 | 0 | 17 | 33 | 15 | 5.81 | 303 |
| Paco Otero | 2024-2028 | .000 | 0 | 0 | 11 | 8 | 10 | 5.23 | 235 |
| Santiago Otero | 2018-2020 | .298 | 2 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Eugenio Ottoboni | 2024-2031 | .261 | 3 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Elmar Oude Nijhuis | 2028-2033 | .290 | 83 | 257 | 0 | 0 | 0 | 0.00 | 0 |
| Les Overdevest | 2014-2018 | .000 | 0 | 0 | 33 | 16 | 0 | 4.77 | 275 |
| Jerrel Overgaag | 2024-2024 | .281 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Owens | 2034-2035 | .000 | 0 | 0 | 2 | 6 | 7 | 5.32 | 82 |
| Clifford Owens | 2038-2042 | .309 | 27 | 202 | 0 | 0 | 0 | 0.00 | 0 |
| Denny Owens | 2039-2043 | .299 | 61 | 290 | 0 | 0 | 0 | 0.00 | 0 |
| Royce Owens | 2036-2043 | .318 | 168 | 617 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Oynelas | 2026-2027 | .224 | 24 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Naohiro Ozaki | 2039-2040 | .264 | 3 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshii Ozaki | 2016-2018 | .282 | 26 | 101 | 0 | 0 | 0 | 0.00 | 0 |
