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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 |
|---|---|---|---|---|---|---|---|---|---|
| Alvin O'Brien | 2020-2022 | .000 | 0 | 0 | 10 | 40 | 2 | 5.07 | 292 |
| Brad O'Brien | 2022-2026 | .281 | 11 | 118 | 0 | 0 | 0 | 13.50 | 0 |
| Kenny O'Brien | 2021-2023 | .248 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Nan | 2020-2026 | .000 | 0 | 0 | 53 | 43 | 1 | 3.93 | 772 |
| Jay O'Reilly | 2021-2027 | .241 | 9 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Reilly | 2030-2030 | .273 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| David Oakley | 2026-2027 | .268 | 20 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Oakley | 2028-2029 | .067 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Obando | 2031-2031 | .000 | 0 | 0 | 4 | 2 | 0 | 3.47 | 56 |
| Will Oberlander | 2027-2029 | .000 | 0 | 0 | 4 | 4 | 1 | 4.24 | 117 |
| Andres Ocampo | 2020-2021 | .000 | 0 | 0 | 2 | 5 | 1 | 4.65 | 60 |
| Carlos Ocampo | 2023-2023 | .000 | 0 | 0 | 3 | 5 | 0 | 4.98 | 13 |
| Ramon Ocampo | 2020-2027 | .000 | 0 | 0 | 42 | 27 | 5 | 3.90 | 595 |
| Pablo Ochoa | 2021-2021 | .000 | 0 | 0 | 1 | 6 | 7 | 8.80 | 25 |
| Matt Odum | 2026-2026 | .000 | 0 | 0 | 1 | 1 | 1 | 1.93 | 5 |
| Junji Ogawa | 2026-2028 | .327 | 2 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Ogletree | 2027-2028 | .342 | 5 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Hector Ohashi | 2024-2024 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ian Ohmer | 2030-2031 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yutaka Okazaki | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 4.00 | 8 |
| Jose Olguin | 2029-2031 | .000 | 0 | 0 | 5 | 7 | 18 | 3.28 | 202 |
| David Oliphant | 2026-2027 | .230 | 7 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Olivo | 2030-2031 | .207 | 26 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Robby Olmsted | 2021-2031 | .000 | 0 | 0 | 28 | 24 | 11 | 4.25 | 544 |
| Danny Olson | 2024-2027 | .000 | 0 | 0 | 33 | 30 | 0 | 3.90 | 413 |
| Danny Olson | 2025-2025 | .000 | 0 | 0 | 2 | 4 | 12 | 4.11 | 24 |
| J.C. Olson | 2027-2031 | .000 | 0 | 0 | 45 | 27 | 0 | 3.42 | 488 |
| Jim Olson | 2020-2024 | .215 | 16 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Olson | 2026-2027 | .173 | 9 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| John Olson | 2028-2031 | .302 | 2 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Justin Olson | 2025-2030 | .164 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Olson | 2025-2027 | .000 | 0 | 0 | 2 | 0 | 0 | 2.31 | 14 |
| Tim Olson | 2028-2031 | .253 | 49 | 181 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Olston | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Olvera | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 3 | 0.00 | 4 |
| Eric Ommen | 2031-2031 | .222 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| John Orel | 2020-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 1.27 | 25 |
| Pat Orel | 2025-2025 | .187 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Orellana | 2020-2020 | .267 | 6 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Origel | 2028-2028 | .000 | 0 | 0 | 2 | 2 | 1 | 4.53 | 46 |
| Alex Ornelas | 2020-2021 | .000 | 0 | 0 | 1 | 0 | 0 | 4.09 | 12 |
| Arturo Ornelas | 2020-2023 | .248 | 50 | 153 | 0 | 0 | 0 | 0.00 | 0 |
| Estanislau Ornelas | 2026-2027 | .267 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Rico Orocio | 2020-2024 | .265 | 47 | 215 | 0 | 0 | 0 | 0.00 | 0 |
| Jean Orozco | 2020-2022 | .000 | 0 | 0 | 5 | 2 | 0 | 4.19 | 55 |
| David Ortega | 2027-2031 | .000 | 0 | 0 | 5 | 9 | 18 | 3.68 | 154 |
| Jesus Ortega | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 18.00 | 1 |
| Juan Ortega | 2027-2028 | .000 | 0 | 0 | 1 | 1 | 0 | 3.25 | 33 |
| Kevin Orth | 2021-2024 | .000 | 0 | 0 | 6 | 17 | 28 | 3.28 | 321 |
| Arturo Ortiz | 2028-2031 | .000 | 0 | 0 | 39 | 23 | 0 | 3.76 | 321 |
| Brenden Ortiz | 2020-2022 | .229 | 29 | 110 | 0 | 0 | 0 | 13.50 | 3 |
| Carlos Ortiz | 2031-2031 | .132 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Ortiz | 2022-2023 | .270 | 11 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Ortiz | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 10.80 | 1 |
| Dave Ortiz | 2022-2024 | .267 | 8 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ortiz | 2023-2024 | .258 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 2020-2023 | .305 | 10 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortiz | 2020-2023 | .211 | 3 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Ortiz | 2020-2020 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Osborn | 2025-2025 | .221 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jeremy Osborne | 2029-2029 | .252 | 6 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Matthew Osborne | 2021-2023 | .198 | 9 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Ivan Osorio | 2031-2031 | .000 | 0 | 0 | 1 | 0 | 1 | 3.96 | 23 |
| Jeremy Ott | 2020-2024 | .000 | 0 | 0 | 4 | 2 | 32 | 2.69 | 71 |
| Adam Otte | 2028-2031 | .000 | 0 | 0 | 27 | 14 | 7 | 4.58 | 373 |
| Atsushi Ouchi | 2021-2026 | .267 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| James Ouellette | 2031-2031 | .250 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Overton | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 6 |
| Andrew Owenby | 2028-2029 | .000 | 0 | 0 | 7 | 20 | 0 | 5.06 | 144 |
| Mike Owens | 2020-2022 | .266 | 4 | 62 | 0 | 0 | 0 | 0.00 | 0 |
