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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 |
|---|---|---|---|---|---|---|---|---|---|
| Derek O'Bligh | 2028-2028 | .300 | 5 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Brian | 2022-2022 | .000 | 0 | 0 | 3 | 9 | 3 | 4.75 | 31 |
| Dave O'Bryan | 2035-2035 | .053 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Bryan | 2031-2031 | .351 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Conner | 2015-2024 | .243 | 28 | 160 | 0 | 0 | 0 | 0.00 | 0 |
| Ed O'Connor | 2022-2022 | .000 | 0 | 0 | 6 | 1 | 1 | 2.82 | 72 |
| Jeff O'Day | 2034-2034 | .271 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Randy O'Day | 2031-2033 | .232 | 9 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Flaherty | 2016-2016 | .000 | 0 | 0 | 0 | 1 | 3 | 2.16 | 32 |
| Randy O'Herlihy | 2021-2023 | .179 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Erik O'Keefe | 2032-2035 | .000 | 0 | 0 | 8 | 10 | 3 | 4.72 | 249 |
| Juan O'Mahoney | 2021-2022 | .254 | 21 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Mulcahy | 2034-2034 | .000 | 0 | 0 | 0 | 2 | 0 | 3.00 | 7 |
| Sean O'Neal | 2026-2027 | .000 | 0 | 0 | 1 | 2 | 0 | 5.03 | 18 |
| Mike O'Neil | 2026-2026 | .000 | 0 | 0 | 6 | 4 | 0 | 4.82 | 28 |
| Sam O'Neil | 2021-2021 | .299 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Neill | 2029-2029 | .287 | 2 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2017-2017 | .242 | 8 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Tony O'Quinn | 2032-2034 | .000 | 0 | 0 | 8 | 12 | 47 | 3.24 | 133 |
| Joe O'Reilly | 2021-2022 | .246 | 1 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Curt O'Rourke | 2032-2035 | .000 | 0 | 0 | 33 | 16 | 1 | 3.99 | 364 |
| Stu O'Talharan | 2030-2031 | .000 | 0 | 0 | 9 | 24 | 0 | 6.26 | 171 |
| Matt Oberste | 2023-2023 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Omar Obregon | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Derek Odell | 2018-2018 | .306 | 8 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Doug Odom | 2028-2031 | .000 | 0 | 0 | 24 | 13 | 8 | 4.26 | 291 |
| Joseph Odom | 2015-2016 | .250 | 14 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Oglethorpe | 2029-2029 | .231 | 0 | 0 | 1 | 2 | 2 | 4.24 | 35 |
| Jorge Ojeda | 2031-2031 | .285 | 19 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ojeda | 2030-2033 | .000 | 0 | 0 | 7 | 1 | 4 | 4.93 | 121 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| José Oliva | 2028-2029 | .234 | 35 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Iramis Olivencia | 2017-2024 | .285 | 8 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oliver | 2020-2020 | .000 | 0 | 0 | 2 | 4 | 1 | 4.77 | 37 |
| Connor Oliver | 2019-2020 | .280 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Oliver | 2032-2032 | .213 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Lester Oliveros | 2015-2015 | .000 | 0 | 0 | 0 | 1 | 0 | 6.75 | 0 |
| Chris Olson | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 10 |
| Erik Olson | 2025-2028 | .000 | 0 | 0 | 11 | 18 | 3 | 5.56 | 168 |
| Stu Olson | 2023-2023 | .194 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Olson | 2015-2019 | .000 | 0 | 0 | 13 | 16 | 6 | 4.99 | 187 |
| Mike Olt | 2023-2023 | .262 | 13 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Ángelo Olvera | 2023-2026 | .000 | 0 | 0 | 1 | 4 | 1 | 3.76 | 68 |
| Nathan Orf | 2017-2023 | .279 | 10 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Derek Orleans | 2025-2025 | .217 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Oropesa | 2020-2022 | .303 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| José Orozco | 2030-2031 | .262 | 45 | 130 | 0 | 0 | 0 | 21.60 | 2 |
| Luis Orozco | 2026-2026 | .000 | 0 | 0 | 1 | 1 | 2 | 3.74 | 45 |
| Mario Orozco | 2033-2034 | .275 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Orozco | 2028-2028 | .284 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Orozco | 2023-2024 | .000 | 0 | 0 | 1 | 2 | 1 | 5.33 | 46 |
| Angel Ortega | 2015-2019 | .272 | 16 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ortega | 2035-2035 | .000 | 0 | 0 | 10 | 1 | 1 | 3.32 | 81 |
| Arturo Ortega | 2021-2029 | .240 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Don Ortega | 2034-2035 | .233 | 30 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Ortega | 2022-2024 | .256 | 12 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortega | 2029-2032 | .280 | 78 | 253 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2034-2035 | .226 | 5 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2030-2032 | .288 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2025-2026 | .207 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2025-2026 | .208 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Albert Ortíz | 2029-2029 | .000 | 0 | 0 | 4 | 10 | 11 | 5.85 | 85 |
| António Ortíz | 2025-2025 | .214 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Dalfis Ortiz | 2018-2018 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Ortiz | 2015-2016 | .292 | 19 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Enrico Ortíz | 2033-2033 | .138 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Ortíz | 2035-2035 | .333 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Ortíz | 2018-2018 | .000 | 0 | 0 | 11 | 5 | 0 | 4.81 | 99 |
| Jesús Ortíz | 2022-2025 | .210 | 8 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2030-2031 | .267 | 14 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2026-2026 | .000 | 0 | 0 | 2 | 1 | 0 | 5.35 | 23 |
| José Ortíz | 2017-2017 | .269 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2023-2023 | .000 | 0 | 0 | 2 | 0 | 0 | 3.18 | 21 |
| Juan Ortiz | 2017-2019 | .296 | 18 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Ortíz | 2034-2035 | .258 | 11 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2026-2027 | .000 | 0 | 0 | 11 | 20 | 0 | 5.25 | 216 |
| Luis Ortiz | 2019-2019 | .000 | 0 | 0 | 1 | 0 | 0 | 5.14 | 5 |
| Tomás Ortíz | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ortíz | 2029-2033 | .228 | 43 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| Rob Osborne | 2028-2033 | .301 | 28 | 168 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Osborne | 2029-2029 | .375 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Chet Oses | 2025-2026 | .190 | 8 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osuna | 2019-2025 | .277 | 24 | 133 | 0 | 0 | 0 | 0.00 | 0 |
| Hanleth Otano | 2022-2022 | .255 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Matty Ott | 2020-2023 | .000 | 0 | 0 | 11 | 4 | 5 | 2.11 | 215 |
| Josh Outman | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 2.08 | 5 |
| Dillon Overton | 2021-2021 | .000 | 0 | 0 | 4 | 2 | 0 | 3.31 | 49 |
| Johnny Owen | 2029-2033 | .277 | 85 | 289 | 0 | 0 | 0 | 0.00 | 0 |
| Kris Owens | 2026-2029 | .250 | 42 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Owens | 2032-2034 | .208 | 31 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Pete Owens | 2032-2034 | .000 | 0 | 0 | 11 | 10 | 1 | 5.95 | 198 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Sam Owens | 2032-2033 | .000 | 0 | 0 | 16 | 5 | 0 | 4.60 | 120 |
| Fernery Ozuna | 2017-2021 | .265 | 8 | 63 | 0 | 0 | 0 | 0.00 | 0 |
