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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 |
|---|---|---|---|---|---|---|---|---|---|
| Brett O'Brien | 2049-2049 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Brien | 2022-2025 | .194 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ken O'Brien | 2039-2046 | .194 | 27 | 112 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin O'Brien | 2030-2033 | .000 | 0 | 0 | 1 | 1 | 0 | 3.09 | 11 |
| Mark O'Brien | 2021-2025 | .146 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Brien | 2019-2028 | .000 | 0 | 0 | 39 | 39 | 19 | 4.00 | 664 |
| Devin O'Bryan | 2065-2065 | .243 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Connor | 2058-2065 | .000 | 0 | 0 | 85 | 102 | 0 | 4.67 | 1055 |
| Damian O'Daly | 2058-2065 | .276 | 114 | 421 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Day | 2024-2032 | .222 | 18 | 174 | 0 | 0 | 0 | 0.00 | 0 |
| Earnest O'Gagarty | 2064-2065 | .000 | 0 | 0 | 0 | 0 | 0 | 3.82 | 28 |
| Jimmy O'Higgins | 2027-2037 | .228 | 27 | 197 | 0 | 0 | 0 | 0.00 | 0 |
| Billy O'Neal | 2019-2031 | .000 | 0 | 0 | 29 | 35 | 13 | 3.31 | 498 |
| Corey O'Neal | 2048-2065 | .264 | 357 | 1211 | 0 | 0 | 0 | 0.00 | 0 |
| Sean O'Neal | 2022-2037 | .000 | 0 | 0 | 150 | 107 | 9 | 3.52 | 2092 |
| Tyler O'Neal | 2060-2065 | .263 | 48 | 215 | 0 | 0 | 0 | 0.00 | 0 |
| Larry O'Neil | 2023-2025 | .214 | 2 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Robinson O'Neil | 2019-2027 | .275 | 79 | 551 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Neill | 2063-2065 | .261 | 33 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| River O'Neill | 2052-2062 | .000 | 0 | 0 | 40 | 33 | 5 | 4.94 | 346 |
| Dave O'Quinn | 2026-2038 | .000 | 0 | 0 | 20 | 12 | 12 | 3.98 | 571 |
| Jon O'Quinn | 2019-2020 | .121 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Quinn | 2060-2065 | .000 | 0 | 0 | 23 | 7 | 0 | 4.32 | 354 |
| Joseph O'Reilly | 2046-2057 | .000 | 0 | 0 | 91 | 110 | 36 | 4.49 | 1527 |
| Bill O'Toole | 2050-2063 | .256 | 5 | 26 | 184 | 175 | 0 | 4.13 | 2977 |
| Jose Ocasio | 2064-2065 | .296 | 3 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ochoa | 2052-2060 | .240 | 80 | 287 | 0 | 0 | 0 | 0.00 | 0 |
| Stanley Odom | 2031-2031 | .229 | 1 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Oglethorpe | 2052-2065 | .298 | 325 | 1209 | 0 | 0 | 0 | 0.00 | 0 |
| Saikaku Ohashi | 2065-2065 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 2 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Augusto Ojeda | 2061-2063 | .249 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Ojeda | 2035-2035 | .261 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Oki Okada | 2019-2032 | .000 | 0 | 0 | 241 | 148 | 0 | 3.19 | 2486 |
| Shunen Okawa | 2019-2025 | .000 | 0 | 0 | 13 | 11 | 7 | 3.22 | 207 |
| Antonio Oliva | 2031-2042 | .259 | 182 | 759 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Olivares | 2058-2065 | .000 | 0 | 0 | 23 | 30 | 59 | 4.53 | 393 |
| Pablo Olivarez | 2049-2063 | .272 | 439 | 1419 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Oliveira | 2059-2065 | .000 | 0 | 0 | 37 | 43 | 2 | 4.82 | 355 |
| Benton Oliver | 2038-2048 | .245 | 107 | 363 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oliver | 2019-2032 | .000 | 0 | 0 | 57 | 63 | 110 | 3.01 | 539 |
| Patrick Olsen | 2056-2062 | .239 | 16 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Olsen | 2037-2047 | .000 | 0 | 0 | 32 | 38 | 28 | 4.75 | 317 |
| Conrad Olson | 2029-2038 | .249 | 116 | 363 | 0 | 0 | 0 | 0.00 | 0 |
| Matthew Olson | 2055-2065 | .000 | 0 | 0 | 167 | 120 | 23 | 3.59 | 2118 |
| Rob Olson | 2027-2037 | .239 | 30 | 202 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Olson | 2064-2065 | .000 | 0 | 0 | 1 | 0 | 0 | 7.39 | 24 |
| Otto Orf | 2028-2046 | .000 | 0 | 0 | 98 | 97 | 553 | 3.06 | 1214 |
| Angel Orozco | 2032-2043 | .247 | 250 | 813 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Orr | 2019-2027 | .000 | 0 | 0 | 30 | 27 | 252 | 1.90 | 614 |
| Vincent Orr | 2053-2065 | .000 | 0 | 0 | 73 | 109 | 89 | 4.58 | 1263 |
| Esteban Ortega | 2024-2026 | .190 | 39 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortega | 2044-2051 | .000 | 0 | 0 | 40 | 49 | 121 | 4.28 | 432 |
| Luis Ortega | 2028-2040 | .000 | 0 | 0 | 141 | 113 | 13 | 3.94 | 2089 |
| Manny Ortega | 2019-2024 | .000 | 0 | 0 | 11 | 14 | 74 | 3.34 | 262 |
| Bernard Ortiz | 2045-2060 | .283 | 461 | 1514 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortiz | 2045-2057 | .000 | 0 | 0 | 55 | 44 | 103 | 4.05 | 421 |
| Carlos Ortiz | 2022-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Geoffrey Ortiz | 2063-2065 | .281 | 56 | 161 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2041-2045 | .260 | 11 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2035-2035 | .000 | 0 | 0 | 0 | 0 | 0 | 4.70 | 8 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Ortiz | 2054-2064 | .239 | 51 | 233 | 0 | 0 | 0 | 0.00 | 0 |
| Julio Ortiz | 2019-2025 | .000 | 0 | 0 | 23 | 28 | 38 | 3.60 | 360 |
| Manuel Ortiz | 2060-2065 | .288 | 6 | 225 | 0 | 0 | 0 | 0.00 | 0 |
| Oz Ortiz | 2048-2058 | .000 | 0 | 0 | 113 | 113 | 0 | 4.44 | 1419 |
| Pedro Ortiz | 2051-2053 | .000 | 0 | 0 | 1 | 2 | 2 | 4.50 | 111 |
| Pedro Ortiz | 2037-2041 | .000 | 0 | 0 | 2 | 2 | 0 | 4.96 | 71 |
| Roberto Ortiz | 2052-2063 | .260 | 271 | 730 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Osborne | 2036-2048 | .000 | 0 | 0 | 34 | 38 | 15 | 4.06 | 580 |
| Bubba Osborne | 2059-2059 | .375 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Osuna | 2061-2065 | .229 | 9 | 33 | 2 | 1 | 1 | 5.50 | 13 |
| Tekkan Ota | 2022-2023 | .212 | 17 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Owen | 2045-2059 | .241 | 266 | 753 | 0 | 0 | 0 | 0.00 | 0 |
| David Owen | 2063-2064 | .229 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Desi Owen | 2056-2065 | .000 | 0 | 0 | 86 | 76 | 87 | 4.37 | 1461 |
| J.J. Owens | 2035-2040 | .266 | 20 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy Owens | 2023-2029 | .231 | 19 | 189 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Owens | 2026-2028 | .167 | 9 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Owens | 2027-2027 | .218 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
