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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 0 | 4.55 | 44 |
| Jack O'Brien | 2019-2024 | .292 | 10 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Brien | 2016-2019 | .285 | 5 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2017-2025 | .000 | 0 | 0 | 20 | 20 | 8 | 4.54 | 260 |
| Chris O'Colgley | 2013-2015 | .359 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Colin O'Connell | 2030-2031 | .301 | 21 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Dennis O'Connor | 2015-2016 | .293 | 10 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Day | 2029-2031 | .246 | 9 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2022-2025 | .257 | 6 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy O'Flahavan | 2030-2030 | .000 | 0 | 0 | 10 | 4 | 0 | 2.93 | 84 |
| Trevor O'Herlihy | 2030-2031 | .292 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent O'Higgin | 2029-2030 | .000 | 0 | 0 | 6 | 5 | 0 | 3.83 | 106 |
| William O'Keefe | 2027-2030 | .283 | 13 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Monaghan | 2023-2025 | .260 | 7 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Neal | 2018-2019 | .401 | 23 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Neal | 2031-2031 | .287 | 11 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2020-2021 | .000 | 0 | 0 | 7 | 8 | 20 | 3.90 | 45 |
| Ron O'Slattery | 2017-2022 | .000 | 0 | 0 | 15 | 16 | 0 | 5.69 | 212 |
| Will O'Slattery | 2021-2030 | .000 | 0 | 0 | 3 | 11 | 26 | 4.37 | 85 |
| Jake O'Tomalty | 2026-2026 | .000 | 0 | 0 | 1 | 0 | 0 | 3.00 | 19 |
| Robert Emmet Odlum | 2027-2031 | .239 | 2 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oglander | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Floyd Oglethorpe | 2017-2018 | .000 | 0 | 0 | 7 | 13 | 0 | 7.60 | 113 |
| Taro Ohayashi | 2023-2027 | .000 | 0 | 0 | 5 | 7 | 5 | 4.02 | 76 |
| Akihiko Oike | 2024-2026 | .213 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Noburo Oishi | 2029-2031 | .000 | 0 | 0 | 6 | 5 | 4 | 4.83 | 61 |
| Noriaki Okada | 2025-2025 | .275 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Takechi Okubo | 2030-2031 | .120 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oliva | 2022-2024 | .000 | 0 | 0 | 5 | 5 | 2 | 4.27 | 61 |
| Brian Olivares | 2016-2017 | .250 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Cipriano Oliveira | 2017-2019 | .289 | 21 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Emil Olsson | 2027-2031 | .000 | 0 | 0 | 8 | 8 | 0 | 4.93 | 66 |
| José Olvera | 2027-2028 | .243 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2026-2027 | .000 | 0 | 0 | 3 | 1 | 4 | 3.60 | 45 |
| Kazu Omori | 2030-2030 | .000 | 0 | 0 | 3 | 2 | 0 | 2.89 | 26 |
| Tzu-hsia Ong | 2031-2031 | .000 | 0 | 0 | 1 | 1 | 0 | 12.00 | 2 |
| Mike Ontiveros | 2019-2021 | .354 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2025-2025 | .109 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2017-2020 | .259 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Ornelas | 2031-2031 | .000 | 0 | 0 | 3 | 0 | 0 | 2.57 | 4 |
| Francisco Ornelas | 2022-2029 | .273 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2022-2031 | .262 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2026-2026 | .271 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Ortega | 2030-2030 | .313 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortega | 2020-2029 | .296 | 15 | 240 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2028-2029 | .228 | 6 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2025-2028 | .242 | 5 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 2018-2019 | .000 | 0 | 0 | 2 | 6 | 16 | 8.13 | 20 |
| Pedro Ortega | 2029-2030 | .227 | 5 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 0 | 4.05 | 15 |
| Alberto Ortíz | 2015-2022 | .322 | 16 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2019-2019 | .266 | 5 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortíz | 2028-2029 | .000 | 0 | 0 | 5 | 8 | 2 | 4.98 | 97 |
| Cisco Ortíz | 2026-2031 | .000 | 0 | 0 | 7 | 17 | 1 | 5.35 | 126 |
| Emílio Ortíz | 2024-2025 | .294 | 1 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2030-2031 | .253 | 6 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2026-2030 | .000 | 0 | 0 | 21 | 18 | 2 | 3.98 | 225 |
| José Ortíz | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 3 | 3.38 | 22 |
| Luis Ortíz | 2027-2028 | .000 | 0 | 0 | 6 | 8 | 0 | 4.96 | 98 |
| Martin Ortíz | 2029-2031 | .000 | 0 | 0 | 7 | 3 | 3 | 2.89 | 75 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pedro Ortíz | 2030-2030 | .000 | 0 | 0 | 0 | 1 | 0 | 5.79 | 3 |
| Reynaldo Ortíz | 2022-2026 | .000 | 0 | 0 | 6 | 4 | 0 | 2.64 | 135 |
| Sergio Ortíz | 2024-2024 | .252 | 7 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2027-2029 | .000 | 0 | 0 | 5 | 0 | 3 | 4.54 | 44 |
| Ken Osborne | 2017-2028 | .296 | 10 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2027-2027 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Otero | 2029-2029 | .000 | 0 | 0 | 3 | 3 | 0 | 4.92 | 49 |
| Alfred Owen | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2016-2016 | .297 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Doruk Oyan | 2016-2018 | .000 | 0 | 0 | 25 | 21 | 0 | 5.79 | 333 |
