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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 |
|---|---|---|---|---|---|---|---|---|---|
| Benny O'Brian | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Bryan | 2035-2035 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jake O'Connor | 2032-2033 | .086 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Cuirneen | 2034-2034 | .000 | 0 | 0 | 1 | 0 | 3 | 1.37 | 14 |
| Bob O'Dell | 2028-2028 | .000 | 0 | 0 | 2 | 1 | 1 | 4.23 | 93 |
| Derek O'Dell | 2029-2030 | .256 | 7 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Dowd | 2018-2018 | .241 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Thom O'Esmond | 2035-2035 | .050 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff O'Farrell | 2035-2035 | .000 | 0 | 0 | 3 | 3 | 0 | 6.75 | 21 |
| Joe O'Hoey | 2032-2032 | .326 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Artie O'Keefe | 2027-2031 | .000 | 0 | 0 | 25 | 16 | 2 | 4.48 | 431 |
| Derek O'Keefe | 2018-2019 | .000 | 0 | 0 | 11 | 11 | 0 | 3.82 | 200 |
| Juan O'Mahoney | 2019-2020 | .281 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Mulcahy | 2034-2034 | .000 | 0 | 0 | 1 | 1 | 1 | 5.65 | 64 |
| Jimmy O'Neil | 2024-2025 | .252 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Pat O'Neil | 2027-2029 | .211 | 5 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Neill | 2031-2032 | .272 | 15 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Neill | 2029-2029 | .240 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2015-2017 | .272 | 29 | 161 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Quinn | 2034-2034 | .000 | 0 | 0 | 7 | 5 | 0 | 3.12 | 137 |
| Dan O'Reilly | 2026-2028 | .204 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Reilly | 2034-2035 | .189 | 16 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Lonnie O'Reilly | 2017-2021 | .257 | 19 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Toole | 2035-2035 | .211 | 2 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Dominic O'Toole | 2024-2026 | .000 | 0 | 0 | 22 | 14 | 1 | 4.32 | 269 |
| Chris Oakely | 2017-2018 | .000 | 0 | 0 | 14 | 17 | 0 | 5.12 | 158 |
| Kenny Oakley | 2019-2020 | .000 | 0 | 0 | 4 | 3 | 3 | 4.48 | 50 |
| Octávio Ocampo | 2025-2025 | .235 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Ánibal Ochoa | 2035-2035 | .295 | 13 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ochoa | 2034-2035 | .220 | 10 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Gregorio Odilo | 2035-2035 | .000 | 0 | 0 | 3 | 1 | 0 | 4.17 | 53 |
| Keiji Okazaki | 2031-2034 | .200 | 11 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Okert | 2015-2016 | .000 | 0 | 0 | 12 | 7 | 6 | 2.62 | 126 |
| Juan Oliva | 2034-2034 | .000 | 0 | 0 | 1 | 1 | 3 | 3.07 | 12 |
| Juan Oliva | 2031-2032 | .223 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Olivas | 2034-2034 | .000 | 0 | 0 | 8 | 6 | 0 | 2.86 | 118 |
| Sergio Olivas | 2026-2027 | .000 | 0 | 0 | 11 | 10 | 0 | 5.47 | 73 |
| Octávio Oliveira | 2034-2034 | .214 | 0 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Flávio Olivena | 2025-2027 | .152 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ty Oliver | 2022-2022 | .000 | 0 | 0 | 6 | 3 | 0 | 3.01 | 61 |
| Mike Olson | 2028-2029 | .222 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Stu Olson | 2021-2024 | .252 | 30 | 194 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Olvera | 2035-2035 | .196 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Augusto Olvera | 2034-2034 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Onslow | 2034-2034 | .000 | 0 | 0 | 3 | 7 | 30 | 3.72 | 58 |
| José Ontiveros | 2029-2029 | .210 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Balthazar Ophoven | 2026-2028 | .000 | 0 | 0 | 15 | 8 | 2 | 4.40 | 147 |
| Ánibal Ornelas | 2029-2032 | .000 | 0 | 0 | 4 | 8 | 7 | 4.82 | 155 |
| Juan Ornelas | 2025-2027 | .000 | 0 | 0 | 12 | 20 | 1 | 4.52 | 237 |
| Alfredo Orosco | 2034-2034 | .333 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orosco | 2032-2032 | .000 | 0 | 0 | 9 | 8 | 0 | 3.34 | 139 |
| Kip Orosco | 2024-2024 | .000 | 0 | 0 | 0 | 1 | 0 | 9.88 | 10 |
| Pancho Orosco | 2023-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Cris Orozco | 2025-2025 | .182 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Orozco | 2034-2035 | .000 | 0 | 0 | 3 | 9 | 2 | 5.38 | 71 |
| Raúl Orozco | 2034-2035 | .000 | 0 | 0 | 10 | 6 | 12 | 4.47 | 115 |
| Sergio Orozco | 2025-2025 | .200 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Orozco | 2021-2023 | .135 | 0 | 0 | 10 | 7 | 26 | 3.57 | 199 |
| Ron Orr | 2029-2030 | .259 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortega | 2034-2034 | .000 | 0 | 0 | 0 | 1 | 4 | 2.21 | 57 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jesús Ortega | 2032-2033 | .000 | 0 | 0 | 4 | 12 | 2 | 5.57 | 102 |
| Jorge Ortega | 2029-2032 | .250 | 6 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2019-2021 | .292 | 18 | 103 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2023-2023 | .179 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Ortega | 2034-2035 | .000 | 0 | 0 | 1 | 4 | 1 | 6.75 | 29 |
| Sergio Ortega | 2020-2023 | .188 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Augusto Ortíz | 2033-2033 | .000 | 0 | 0 | 0 | 1 | 1 | 4.86 | 48 |
| Aurelio Ortíz | 2033-2033 | .217 | 1 | 19 | 8 | 6 | 0 | 4.31 | 88 |
| Edgardo Ortíz | 2024-2026 | .293 | 39 | 185 | 0 | 0 | 0 | 0.00 | 0 |
| Elián Ortíz | 2034-2034 | .252 | 11 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Iván Ortíz | 2028-2029 | .000 | 0 | 0 | 8 | 18 | 2 | 5.07 | 212 |
| Jorge Ortíz | 2034-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 9.95 | 8 |
| Jorge Ortíz | 2023-2029 | .247 | 64 | 311 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2017-2017 | .275 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 1 |
| Juan Ortíz | 2021-2023 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2033-2034 | .000 | 0 | 0 | 0 | 1 | 0 | 17.47 | 3 |
| Luis Ortíz | 2026-2026 | .000 | 0 | 0 | 1 | 8 | 0 | 5.91 | 45 |
| Mauro Ortíz | 2034-2034 | .000 | 0 | 0 | 6 | 8 | 0 | 4.46 | 145 |
| Miguel Angel Ortíz | 2027-2030 | .316 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Phillip Ortiz | 2020-2020 | .000 | 0 | 0 | 5 | 4 | 0 | 2.30 | 64 |
| Raúl Ortíz | 2032-2033 | .313 | 1 | 69 | 13 | 23 | 0 | 5.28 | 182 |
| J.D. Osborne | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 3.38 | 3 |
| Chet Oses | 2024-2024 | .318 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Osich Jr. | 2032-2033 | .255 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| António Osuba | 2032-2035 | .283 | 8 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Lenix Osuna | 2016-2020 | .000 | 0 | 0 | 12 | 8 | 38 | 2.64 | 157 |
| Jorge Otero | 2025-2027 | .189 | 6 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| José Otero | 2035-2035 | .000 | 0 | 0 | 1 | 3 | 3 | 3.42 | 66 |
| Dillon Overton | 2015-2016 | .000 | 0 | 0 | 8 | 13 | 0 | 4.38 | 137 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bobby Owens | 2026-2028 | .000 | 0 | 0 | 0 | 0 | 3 | 2.60 | 31 |
| Pete Owens | 2032-2032 | .000 | 0 | 0 | 6 | 5 | 0 | 2.13 | 86 |
| Rob Owens | 2020-2020 | .214 | 12 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Fernery Ozuna | 2016-2016 | .348 | 0 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenz Ozuna | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 6.35 | 11 |
