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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jake O'Brien | 2028-2031 | .273 | 11 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Gabe O'Connor | 2029-2041 | .000 | 0 | 0 | 30 | 41 | 169 | 3.12 | 727 |
| Grant O'Halloran | 2020-2022 | .221 | 3 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Keeffe | 2030-2041 | .000 | 0 | 0 | 138 | 122 | 0 | 3.49 | 2253 |
| Phil O'Sullivan | 2018-2021 | .000 | 0 | 0 | 8 | 30 | 0 | 5.62 | 170 |
| Peter Ochoa | 2026-2041 | .292 | 76 | 688 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Ochoa | 2022-2023 | .000 | 0 | 0 | 1 | 0 | 0 | 5.65 | 7 |
| Bobby Oder | 2036-2037 | .129 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Odin | 2020-2020 | .130 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Ogden | 2035-2041 | .000 | 0 | 0 | 16 | 15 | 3 | 3.43 | 442 |
| Rene Oliva | 2027-2039 | .287 | 245 | 808 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Olivares | 2026-2029 | .000 | 0 | 0 | 5 | 42 | 0 | 7.02 | 204 |
| Marcos Olivas | 2038-2040 | .158 | 6 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olivier | 2021-2021 | .203 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Angel Olmedo | 2019-2021 | .000 | 0 | 0 | 1 | 0 | 0 | 4.05 | 16 |
| Matt Olson | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 1 |
| Nick Olveda | 2041-2041 | .258 | 9 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Orantes | 2035-2035 | .118 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Orlando | 2018-2019 | .269 | 1 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ornelas | 2024-2035 | .308 | 103 | 463 | 0 | 0 | 0 | 0.00 | 1 |
| Charlie Orr | 2026-2028 | .219 | 5 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Orr | 2035-2041 | .000 | 0 | 0 | 47 | 35 | 0 | 4.22 | 805 |
| Paul Orr | 2018-2022 | .224 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortega | 2025-2026 | .294 | 5 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortega | 2019-2019 | .136 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortega | 2028-2038 | .271 | 15 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Ortiz | 2029-2036 | .278 | 89 | 453 | 0 | 0 | 0 | 0.00 | 0 |
| Gabe Ortiz | 2018-2019 | .000 | 0 | 0 | 20 | 23 | 0 | 4.37 | 227 |
| Mike Osburn | 2039-2041 | .200 | 2 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osorio | 2036-2040 | .231 | 21 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jose Osuna | 2023-2029 | .000 | 0 | 0 | 20 | 20 | 38 | 4.41 | 426 |
| Jason Ottem | 2022-2025 | .269 | 15 | 117 | 2 | 0 | 1 | 5.76 | 27 |
| Bryan Ottinger | 2035-2036 | .203 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Kent Ough | 2032-2041 | .220 | 48 | 215 | 0 | 0 | 0 | 0.00 | 0 |
| Criostóir Owen | 2039-2040 | .208 | 9 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Sam Owen | 2021-2031 | .251 | 109 | 390 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Owen | 2028-2028 | .056 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
