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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 |
| Dennis O'Connor | 2015-2016 | .293 | 10 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2022-2025 | .257 | 6 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Keefe | 2027-2027 | .254 | 1 | 6 | 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 |
| 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 | 2021-2025 | .000 | 0 | 0 | 2 | 11 | 25 | 3.65 | 42 |
| Jake O'Tomalty | 2026-2026 | .000 | 0 | 0 | 1 | 0 | 0 | 3.00 | 19 |
| Robert Emmet Odlum | 2027-2027 | .256 | 1 | 22 | 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 |
| Noriaki Okada | 2025-2025 | .275 | 1 | 12 | 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 |
| Cipriano Oliveira | 2017-2019 | .289 | 21 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Emil Olsson | 2027-2027 | .000 | 0 | 0 | 8 | 8 | 0 | 5.03 | 63 |
| 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 |
| 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 |
| Francisco Ornelas | 2022-2022 | .272 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jesús Orozco | 2022-2022 | .217 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2026-2026 | .271 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortega | 2020-2026 | .305 | 15 | 223 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2028-2028 | .240 | 6 | 30 | 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 |
| 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 | 2028-2028 | .000 | 0 | 0 | 1 | 3 | 2 | 5.17 | 41 |
| Cisco Ortíz | 2026-2026 | .000 | 0 | 0 | 4 | 11 | 0 | 5.07 | 76 |
| Emílio Ortíz | 2024-2025 | .294 | 1 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2026-2028 | .000 | 0 | 0 | 16 | 14 | 0 | 3.81 | 145 |
| 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 |
| 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 | 2027-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 2.39 | 15 |
| 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 |
| 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 |
