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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 | 2019-2023 | .139 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Pat O'Brian | 2034-2035 | .255 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Bob O'Brien | 2021-2023 | .272 | 5 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby O'Brien | 2025-2025 | .000 | 0 | 0 | 0 | 2 | 5 | 10.12 | 10 |
| Steve O'Brien | 2028-2028 | .333 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Canavan | 2030-2032 | .243 | 7 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Jake O'Connor | 2030-2030 | .312 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Ollie O'Day | 2024-2026 | .198 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Bob O'Dell | 2025-2027 | .000 | 0 | 0 | 7 | 3 | 3 | 5.08 | 186 |
| Joe O'Donnell | 2019-2020 | .000 | 0 | 0 | 5 | 1 | 1 | 3.43 | 49 |
| Johnny O'Donnell | 2024-2025 | .230 | 0 | 13 | 1 | 7 | 0 | 7.88 | 55 |
| Chris O'Dowd | 2019-2019 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Gallwan | 2033-2033 | .000 | 0 | 0 | 0 | 3 | 9 | 4.32 | 35 |
| Cedric O'Higgins | 2028-2029 | .400 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Hoey | 2034-2034 | .053 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Artie O'Keefe | 2026-2026 | .000 | 0 | 0 | 1 | 2 | 0 | 6.04 | 19 |
| Dan O'Lehan | 2029-2031 | .286 | 0 | 1 | 7 | 5 | 1 | 4.83 | 90 |
| Rusty O'Loman | 2020-2020 | .125 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan O'Mahoney | 2018-2018 | .432 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Bob O'Mooney | 2029-2030 | .223 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Sean O'Neal | 2025-2025 | .000 | 0 | 0 | 2 | 0 | 1 | 0.00 | 12 |
| Ernie O'Neil | 2018-2019 | .000 | 0 | 0 | 8 | 15 | 0 | 5.55 | 148 |
| Mike O'Neil | 2031-2031 | .143 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Sam O'Neil | 2019-2022 | .290 | 3 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry O'Quinn | 2033-2033 | .000 | 0 | 0 | 0 | 1 | 0 | 9.64 | 3 |
| Kevin O'Quinn | 2021-2021 | .265 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Reilly | 2019-2019 | .335 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Curt O'Rourke | 2025-2025 | .000 | 0 | 0 | 1 | 4 | 0 | 8.07 | 25 |
| Josh O'Slattery | 2015-2017 | .211 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Dominic O'Toole | 2021-2023 | .000 | 0 | 0 | 6 | 10 | 0 | 5.58 | 119 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Chris Oakely | 2015-2015 | .000 | 0 | 0 | 3 | 8 | 0 | 4.28 | 65 |
| Kenny Oakley | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 9.82 | 4 |
| Juan Ochoa | 2032-2035 | .223 | 3 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Olivas | 2025-2025 | .000 | 0 | 0 | 2 | 0 | 0 | 4.71 | 22 |
| Andy Oliver | 2030-2031 | .200 | 17 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Oliver | 2029-2034 | .250 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Olson | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 9.64 | 9 |
| Stu Olson | 2019-2020 | .285 | 7 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Olson | 2019-2019 | .000 | 0 | 0 | 0 | 1 | 0 | 10.12 | 2 |
| Ángelo Olvera | 2023-2023 | .000 | 0 | 0 | 3 | 0 | 0 | 2.24 | 57 |
| Augusto Olvera | 2034-2035 | .300 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bryce Only | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Balthazar Ophoven | 2024-2024 | .000 | 0 | 0 | 1 | 0 | 0 | 7.48 | 16 |
| Julián Ordóñez | 2028-2030 | .228 | 5 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Orosco | 2034-2034 | .263 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Pancho Orosco | 2020-2021 | .115 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Orozco | 2031-2031 | .261 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Orozco | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 27.00 | 3 |
| Rodrigo Orozco | 2015-2016 | .273 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Orr | 2028-2028 | .261 | 1 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortega | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Ortega | 2021-2021 | .347 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortega | 2035-2035 | .000 | 0 | 0 | 1 | 5 | 1 | 4.72 | 55 |
| Jorge Ortega | 2028-2028 | .275 | 9 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2019-2020 | .256 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Adrián Ortíz | 2021-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Ortíz | 2034-2034 | .000 | 0 | 0 | 5 | 0 | 0 | 2.72 | 55 |
| César Ortíz | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 1.04 | 13 |
| Edgardo Ortíz | 2021-2023 | .289 | 16 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Elián Ortíz | 2033-2035 | .223 | 13 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Gilberto Ortíz | 2034-2035 | .300 | 10 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Iván Ortíz | 2024-2026 | .288 | 6 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2033-2033 | .000 | 0 | 0 | 0 | 5 | 0 | 11.64 | 17 |
| Jorge Ortíz | 2021-2021 | .272 | 5 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2026-2029 | .000 | 0 | 0 | 8 | 0 | 10 | 4.06 | 186 |
| José Ortíz | 2025-2026 | .375 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2019-2020 | .366 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2031-2031 | .000 | 0 | 0 | 0 | 1 | 0 | 5.40 | 2 |
| Mario Ortíz | 2021-2022 | .270 | 12 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Mauro Ortíz | 2035-2035 | .000 | 0 | 0 | 2 | 2 | 0 | 4.46 | 49 |
| Reggie Ortíz | 2029-2035 | .000 | 0 | 0 | 2 | 8 | 0 | 9.05 | 59 |
| Jim Osborn | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 3.00 | 3 |
| Chet Oses | 2023-2023 | .222 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Osich Jr. | 2031-2031 | .271 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Sam Osmotherley | 2032-2033 | .213 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Neritzon Osorio | 2019-2019 | .000 | 0 | 0 | 1 | 0 | 0 | 1.26 | 19 |
| António Osuba | 2030-2035 | .346 | 13 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Otero | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 16.20 | 2 |
| Jeff Owen | 2019-2019 | .254 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Owens | 2020-2021 | .000 | 0 | 0 | 2 | 5 | 0 | 8.74 | 37 |
| Lou Owens | 2025-2025 | .500 | 0 | 1 | 1 | 0 | 1 | 5.32 | 33 |
| Rob Owens | 2018-2018 | .168 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Fernery Ozuna | 2021-2021 | 1.000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenz Ozuna | 2015-2017 | .000 | 0 | 0 | 6 | 7 | 0 | 4.68 | 119 |
