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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 |
|---|---|---|---|---|---|---|---|---|---|
| Carl O'Brien | 2023-2027 | .238 | 4 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Ken O'Brien | 2042-2047 | .223 | 15 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin O'Brien | 2027-2034 | .000 | 0 | 0 | 47 | 86 | 36 | 5.49 | 584 |
| Mark O'Brien | 2021-2026 | .260 | 42 | 193 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Brien | 2019-2029 | .000 | 0 | 0 | 7 | 8 | 3 | 4.49 | 84 |
| Devin O'Bryan | 2064-2064 | .487 | 6 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Connor | 2058-2058 | .000 | 0 | 0 | 4 | 3 | 0 | 3.94 | 65 |
| Damian O'Daly | 2056-2057 | .332 | 60 | 175 | 0 | 0 | 0 | 0.00 | 0 |
| Keith O'Day | 2060-2065 | .303 | 30 | 223 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Day | 2024-2032 | .304 | 30 | 148 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Dell | 2056-2057 | .000 | 0 | 0 | 4 | 1 | 1 | 6.14 | 83 |
| Jimmy O'Higgins | 2026-2037 | .290 | 10 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Billy O'Neal | 2027-2028 | .000 | 0 | 0 | 13 | 7 | 11 | 2.70 | 155 |
| Corey O'Neal | 2047-2065 | .296 | 56 | 192 | 0 | 0 | 0 | 0.00 | 0 |
| Sean O'Neal | 2023-2023 | .000 | 0 | 0 | 5 | 3 | 1 | 4.21 | 42 |
| Tyler O'Neal | 2056-2061 | .333 | 100 | 374 | 0 | 0 | 0 | 0.00 | 0 |
| Craig O'Neil | 2064-2065 | .280 | 30 | 114 | 0 | 0 | 0 | 0.00 | 0 |
| Larry O'Neil | 2022-2022 | .369 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| River O'Neill | 2048-2060 | .000 | 0 | 0 | 33 | 22 | 38 | 4.10 | 428 |
| Dave O'Quinn | 2024-2040 | .000 | 0 | 0 | 17 | 8 | 46 | 4.17 | 273 |
| Jon O'Quinn | 2019-2021 | .235 | 11 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph O'Reilly | 2045-2058 | .000 | 0 | 0 | 7 | 4 | 18 | 2.70 | 105 |
| Jose Ocasio | 2064-2064 | .294 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Ocasio | 2060-2065 | .000 | 0 | 0 | 50 | 48 | 5 | 5.04 | 833 |
| Carlos Ochoa | 2058-2059 | .312 | 39 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| Hector Ochoa | 2063-2065 | .308 | 20 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Stanley Odom | 2029-2035 | .272 | 29 | 273 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Oglethorpe | 2052-2052 | .355 | 29 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Augusto Ojeda | 2061-2065 | .342 | 11 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Ojeda | 2030-2041 | .307 | 86 | 467 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Antonio Oliva | 2029-2043 | .249 | 50 | 212 | 0 | 0 | 0 | 0.00 | 0 |
| Gustavo Oliva | 2063-2065 | .245 | 6 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Olivares | 2058-2060 | .000 | 0 | 0 | 17 | 7 | 6 | 3.84 | 209 |
| Pablo Olivarez | 2046-2048 | .318 | 107 | 296 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Oliveira | 2057-2060 | .000 | 0 | 0 | 32 | 38 | 0 | 4.17 | 437 |
| Benton Oliver | 2034-2037 | .307 | 55 | 274 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick Olsen | 2053-2061 | .274 | 93 | 393 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Olsen | 2035-2037 | .000 | 0 | 0 | 15 | 10 | 10 | 3.41 | 178 |
| Barney Olson | 2059-2065 | .000 | 0 | 0 | 79 | 46 | 0 | 4.36 | 941 |
| Conrad Olson | 2028-2038 | .276 | 60 | 242 | 0 | 0 | 0 | 0.00 | 0 |
| Matthew Olson | 2054-2054 | .000 | 0 | 0 | 2 | 0 | 3 | 2.08 | 15 |
| Rob Olson | 2026-2037 | .309 | 25 | 160 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Olson | 2065-2065 | .306 | 11 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Olson | 2061-2063 | .000 | 0 | 0 | 11 | 8 | 6 | 3.16 | 91 |
| Otto Orf | 2027-2044 | .000 | 0 | 0 | 2 | 1 | 3 | 2.01 | 30 |
| Angel Orozco | 2041-2041 | .258 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent Orr | 2051-2053 | .000 | 0 | 0 | 4 | 6 | 32 | 5.47 | 129 |
| Esteban Ortega | 2021-2029 | .245 | 131 | 350 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortega | 2040-2052 | .000 | 0 | 0 | 28 | 23 | 26 | 4.48 | 401 |
| Luis Ortega | 2026-2029 | .000 | 0 | 0 | 17 | 27 | 0 | 5.25 | 397 |
| Antonio Ortiz | 2064-2064 | .000 | 0 | 0 | 2 | 3 | 0 | 11.18 | 18 |
| Bernard Ortiz | 2044-2061 | .353 | 52 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortiz | 2043-2054 | .000 | 0 | 0 | 9 | 15 | 57 | 3.92 | 173 |
| Carlos Ortiz | 2020-2025 | .291 | 35 | 137 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Ortiz | 2059-2064 | .275 | 50 | 300 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2037-2046 | .290 | 44 | 273 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2027-2036 | .000 | 0 | 0 | 13 | 11 | 34 | 4.15 | 236 |
| Juan Ortiz | 2054-2065 | .282 | 73 | 289 | 0 | 0 | 0 | 0.00 | 0 |
| Julio Ortiz | 2061-2064 | .000 | 0 | 0 | 12 | 16 | 25 | 4.30 | 138 |
| Ken Ortiz | 2063-2063 | .200 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Manuel Ortiz | 2059-2059 | .261 | 3 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Oz Ortiz | 2046-2048 | .000 | 0 | 0 | 29 | 18 | 0 | 4.25 | 372 |
| Pedro Ortiz | 2051-2057 | .000 | 0 | 0 | 45 | 31 | 8 | 4.13 | 687 |
| Pedro Ortiz | 2036-2042 | .000 | 0 | 0 | 12 | 11 | 30 | 4.93 | 183 |
| Roberto Ortiz | 2051-2052 | .325 | 37 | 138 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Osborne | 2033-2037 | .000 | 0 | 0 | 28 | 19 | 15 | 3.51 | 393 |
| Bubba Osborne | 2057-2065 | .309 | 211 | 789 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Osuna | 2060-2064 | .305 | 49 | 154 | 0 | 0 | 0 | 1.59 | 5 |
| Tekkan Ota | 2019-2024 | .272 | 45 | 147 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Otala | 2065-2065 | .354 | 19 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Owen | 2042-2058 | .292 | 107 | 411 | 0 | 0 | 0 | 0.00 | 0 |
| David Owen | 2062-2065 | .255 | 107 | 296 | 0 | 0 | 0 | 0.00 | 0 |
| Desi Owen | 2055-2056 | .000 | 0 | 0 | 13 | 11 | 17 | 4.42 | 238 |
| Eric Owens | 2060-2063 | .000 | 0 | 0 | 5 | 6 | 5 | 4.90 | 101 |
| J.J. Owens | 2032-2042 | .339 | 70 | 323 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy Owens | 2022-2029 | .276 | 12 | 103 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Owens | 2024-2028 | .252 | 25 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Owens | 2021-2028 | .276 | 7 | 137 | 0 | 0 | 0 | 0.00 | 0 |
