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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 |
|---|---|---|---|---|---|---|---|---|---|
| Chris O'Brien | 2018-2018 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Colyn O'Connell | 2020-2022 | .000 | 0 | 0 | 9 | 0 | 1 | 2.99 | 71 |
| Curt O'Connor | 2023-2023 | .000 | 0 | 0 | 0 | 2 | 8 | 3.60 | 11 |
| Bob O'Dell | 2029-2030 | .000 | 0 | 0 | 6 | 23 | 0 | 5.47 | 184 |
| Derek O'Dell | 2031-2034 | .281 | 24 | 166 | 0 | 0 | 0 | 0.00 | 0 |
| Josh O'Keefe | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 0 | 7.50 | 11 |
| Jeff O'Malquiney | 2032-2035 | .000 | 0 | 0 | 11 | 9 | 2 | 5.35 | 85 |
| Pat O'Neil | 2028-2029 | .249 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Lynwood O'Neill | 2032-2032 | .000 | 0 | 0 | 5 | 5 | 4 | 3.63 | 80 |
| Steve O'Neill | 2030-2031 | .268 | 15 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Andy O'Reilly | 2035-2035 | .125 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Reilly | 2030-2033 | .000 | 0 | 0 | 21 | 12 | 27 | 3.21 | 271 |
| Lonnie O'Reilly | 2019-2021 | .276 | 43 | 151 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Reilly | 2021-2022 | .333 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Garry O'Rorke | 2034-2035 | .000 | 0 | 0 | 7 | 18 | 6 | 8.58 | 163 |
| Curt O'Rourke | 2030-2031 | .000 | 0 | 0 | 9 | 7 | 0 | 3.19 | 95 |
| Jonathan O'Rourke | 2028-2028 | .000 | 0 | 0 | 2 | 1 | 0 | 3.86 | 29 |
| Kenny Oakley | 2021-2021 | .000 | 0 | 0 | 3 | 2 | 0 | 5.13 | 46 |
| David Oca | 2018-2018 | .000 | 0 | 0 | 10 | 8 | 0 | 4.49 | 151 |
| Octávio Ocampo | 2026-2029 | .274 | 21 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ocasio | 2034-2035 | .000 | 0 | 0 | 3 | 6 | 7 | 4.90 | 62 |
| Ánibal Ochoa | 2032-2034 | .252 | 15 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Pepe Ochoa | 2032-2032 | .000 | 0 | 0 | 1 | 1 | 0 | 3.95 | 11 |
| Josh Ockimey | 2019-2020 | .251 | 9 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Derek Odell | 2021-2022 | .359 | 6 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Rougned Odor | 2026-2026 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Koryusai Ohayashi | 2026-2029 | .250 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ojeda | 2028-2028 | .237 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Keiji Okazaki | 2033-2035 | .221 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| José Oliva | 2035-2035 | .414 | 17 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Sergio Olivas | 2026-2027 | .000 | 0 | 0 | 6 | 8 | 0 | 4.95 | 59 |
| Flávio Olivena | 2027-2028 | .278 | 3 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oliver | 2034-2035 | .148 | 12 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Oliver | 2035-2035 | .204 | 13 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ty Oliver | 2025-2026 | .000 | 0 | 0 | 0 | 0 | 1 | 2.57 | 5 |
| Buddy Olson | 2027-2027 | .000 | 0 | 0 | 2 | 2 | 0 | 3.64 | 31 |
| Erik Olson | 2029-2029 | .000 | 0 | 0 | 1 | 3 | 0 | 4.91 | 31 |
| Willie Onslow | 2035-2035 | .000 | 0 | 0 | 0 | 2 | 0 | 9.64 | 7 |
| José Ontiveros | 2030-2031 | .281 | 8 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ordaz | 2025-2027 | .252 | 13 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Ánibal Ornelas | 2034-2034 | .000 | 0 | 0 | 5 | 5 | 20 | 4.07 | 57 |
| Juan Ornelas | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 7.94 | 5 |
| Alfredo Orosco | 2034-2035 | .223 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Pancho Orosco | 2025-2026 | .185 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Cris Orozco | 2026-2027 | .240 | 6 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Orozco | 2029-2029 | .000 | 0 | 0 | 5 | 3 | 1 | 3.32 | 95 |
| Sergio Orozco | 2026-2028 | .220 | 7 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Orr | 2032-2034 | .000 | 0 | 0 | 7 | 2 | 1 | 4.67 | 132 |
| Ron Orr | 2030-2030 | .201 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Mirko Orsag | 2028-2029 | .000 | 0 | 0 | 4 | 1 | 2 | 2.14 | 35 |
| Jesús Ortega | 2034-2034 | .000 | 0 | 0 | 0 | 1 | 0 | 5.79 | 9 |
| José Ortega | 2021-2022 | .280 | 11 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortega | 2021-2022 | .198 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortíz | 2027-2029 | .226 | 8 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortíz | 2033-2033 | .333 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortíz | 2021-2025 | .249 | 10 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Augusto Ortíz | 2025-2026 | .000 | 0 | 0 | 10 | 11 | 0 | 4.25 | 176 |
| Aurelio Ortíz | 2035-2035 | .000 | 0 | 0 | 4 | 2 | 1 | 4.41 | 79 |
| Edgardo Ortíz | 2035-2035 | .325 | 10 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Elián Ortíz | 2035-2035 | .293 | 18 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Iván Ortíz | 2030-2030 | .000 | 0 | 0 | 2 | 4 | 0 | 3.74 | 42 |
| Jorge Ortíz | 2030-2030 | .000 | 0 | 0 | 2 | 1 | 0 | 5.40 | 23 |
| Juan Ortíz | 2032-2032 | .222 | 6 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2026-2028 | .000 | 0 | 0 | 10 | 8 | 13 | 5.26 | 83 |
| Luis Ortíz | 2029-2029 | .000 | 0 | 0 | 8 | 9 | 0 | 5.96 | 125 |
| Mauro Ortíz | 2035-2035 | .000 | 0 | 0 | 7 | 3 | 1 | 4.74 | 60 |
| Raúl Ortíz | 2034-2035 | .286 | 2 | 62 | 8 | 15 | 6 | 5.74 | 152 |
| Reggie Ortíz | 2034-2035 | .000 | 0 | 0 | 1 | 0 | 0 | 7.35 | 41 |
| Rob Osborne | 2034-2034 | .274 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Lenix Osuna | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 3.82 | 27 |
| Roberto Osuna | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 2.57 | 9 |
| Jorge Otero | 2028-2028 | .188 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Todd Otto | 2026-2026 | .000 | 0 | 0 | 1 | 0 | 0 | 3.48 | 31 |
| Dillon Overton | 2016-2017 | .000 | 0 | 0 | 9 | 8 | 0 | 4.19 | 108 |
| Kevin Owens | 2020-2027 | .000 | 0 | 0 | 1 | 2 | 0 | 6.04 | 32 |
| Rob Owens | 2023-2023 | .169 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
