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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | G | GS | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Eddie O'Bryan | 2020-2029 | 241 | 234 | 812 | 99 | 223 | 37 | 1 | 10 | 106 | 6 | 5 | 112 | 153 | .275 | .365 | .360 | .725 | 3.3 |
| Robert O'Connor | 2031-2031 | 75 | 45 | 188 | 32 | 50 | 14 | 0 | 7 | 25 | 0 | 0 | 49 | 30 | .266 | .412 | .452 | .865 | 0.7 |
| Dave O'Day | 2015-2019 | 40 | 39 | 160 | 25 | 37 | 6 | 0 | 3 | 16 | 6 | 3 | 17 | 31 | .231 | .317 | .325 | .642 | -0.7 |
| Christian O'Dell | 2024-2024 | 60 | 36 | 122 | 15 | 30 | 6 | 1 | 1 | 9 | 1 | 0 | 15 | 25 | .246 | .340 | .336 | .676 | -0.1 |
| Trevor O'Herlihy | 2030-2030 | 3 | 3 | 14 | 2 | 3 | 0 | 0 | 1 | 4 | 0 | 0 | 0 | 3 | .214 | .200 | .429 | .629 | -0.1 |
| Mark O'Monaghan | 2018-2018 | 30 | 30 | 106 | 24 | 46 | 10 | 3 | 6 | 14 | 6 | 4 | 19 | 19 | .434 | .524 | .755 | 1.279 | 1.8 |
| Christian O'Neal | 2022-2022 | 77 | 58 | 220 | 28 | 61 | 13 | 0 | 6 | 40 | 0 | 0 | 32 | 30 | .277 | .374 | .418 | .792 | 0.3 |
| Eric O'Neill | 2023-2026 | 100 | 70 | 281 | 43 | 80 | 12 | 4 | 6 | 40 | 4 | 2 | 38 | 65 | .285 | .371 | .420 | .791 | 2.4 |
| Hirohisa Ogasawara | 2029-2030 | 79 | 79 | 327 | 37 | 103 | 21 | 4 | 6 | 52 | 1 | 6 | 15 | 63 | .315 | .351 | .459 | .809 | 1.4 |
| Munemori Ohara | 2024-2032 | 83 | 55 | 229 | 51 | 79 | 14 | 0 | 9 | 48 | 14 | 2 | 37 | 44 | .345 | .450 | .524 | .974 | 2.2 |
| Shigenobu Ohayashi | 2033-2033 | 30 | 30 | 122 | 12 | 32 | 3 | 1 | 3 | 12 | 1 | 4 | 12 | 14 | .262 | .338 | .377 | .715 | -0.0 |
| Akihiko Oike | 2025-2025 | 94 | 87 | 333 | 60 | 94 | 10 | 1 | 17 | 61 | 0 | 0 | 53 | 61 | .282 | .391 | .471 | .863 | 2.9 |
| Noriaki Okada | 2022-2023 | 23 | 17 | 78 | 10 | 20 | 1 | 1 | 1 | 5 | 0 | 1 | 1 | 10 | .256 | .293 | .333 | .626 | 0.2 |
| Brian Olivares | 2018-2019 | 32 | 4 | 43 | 9 | 11 | 2 | 0 | 3 | 12 | 0 | 0 | 7 | 11 | .256 | .360 | .512 | .872 | 0.2 |
| Esteban Olivo | 2030-2031 | 60 | 14 | 74 | 17 | 13 | 1 | 0 | 1 | 6 | 9 | 4 | 13 | 13 | .176 | .311 | .230 | .541 | -0.4 |
| Richard Ollivier | 2017-2019 | 239 | 216 | 795 | 124 | 248 | 36 | 1 | 19 | 122 | 1 | 3 | 73 | 143 | .312 | .376 | .431 | .808 | 0.1 |
| Lawrence Olsen | 2016-2022 | 356 | 279 | 1094 | 168 | 303 | 37 | 1 | 40 | 147 | 1 | 1 | 136 | 182 | .277 | .363 | .422 | .785 | 1.5 |
| Armando Olvera | 2015-2015 | 29 | 28 | 104 | 13 | 25 | 1 | 2 | 0 | 8 | 1 | 0 | 1 | 23 | .240 | .252 | .288 | .541 | -0.9 |
| Octávio Ontiveros | 2031-2033 | 234 | 234 | 809 | 118 | 190 | 32 | 9 | 6 | 86 | 42 | 12 | 135 | 204 | .235 | .346 | .319 | .665 | 5.2 |
| Phil Oostermeer | 2033-2033 | 5 | 5 | 22 | 2 | 9 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 3 | .409 | .417 | .455 | .871 | 0.3 |
| Dave Orchard | 2015-2024 | 224 | 219 | 844 | 131 | 275 | 43 | 10 | 21 | 134 | 10 | 11 | 65 | 204 | .326 | .377 | .475 | .852 | 1.9 |
| Francisco Ornelas | 2021-2031 | 97 | 68 | 293 | 44 | 77 | 16 | 4 | 6 | 41 | 1 | 7 | 58 | 60 | .263 | .389 | .406 | .795 | 0.8 |
| Jesús Orozco | 2017-2032 | 99 | 97 | 380 | 72 | 95 | 13 | 2 | 8 | 45 | 26 | 7 | 72 | 35 | .250 | .376 | .358 | .734 | 1.5 |
| Juan Orozco | 2025-2025 | 26 | 21 | 82 | 13 | 31 | 5 | 0 | 1 | 16 | 0 | 0 | 10 | 9 | .378 | .452 | .476 | .927 | 0.9 |
| Pedro Orozco | 2017-2020 | 285 | 249 | 872 | 140 | 218 | 36 | 3 | 28 | 107 | 22 | 8 | 91 | 234 | .250 | .338 | .394 | .733 | -1.4 |
| Juan Ortega | 2023-2024 | 128 | 125 | 449 | 76 | 118 | 25 | 6 | 1 | 44 | 25 | 10 | 73 | 91 | .263 | .371 | .352 | .723 | 1.5 |
| Norm Ortega | 2015-2015 | 95 | 84 | 330 | 52 | 103 | 19 | 1 | 5 | 46 | 0 | 0 | 36 | 56 | .312 | .380 | .421 | .801 | 0.3 |
| Alberto Ortíz | 2017-2017 | 22 | 18 | 71 | 10 | 20 | 2 | 0 | 1 | 10 | 0 | 1 | 1 | 11 | .282 | .292 | .352 | .644 | -0.4 |
| Emílio Ortíz | 2023-2024 | 79 | 78 | 259 | 36 | 47 | 8 | 2 | 1 | 22 | 11 | 1 | 40 | 37 | .181 | .296 | .239 | .535 | -0.4 |
| Raúl Ortíz | 2024-2032 | 210 | 210 | 837 | 119 | 261 | 46 | 2 | 4 | 93 | 2 | 0 | 120 | 140 | .312 | .406 | .386 | .792 | 6.8 |
| Player | From-To | G | GS | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS | WAR |
| Ken Osborne | 2020-2021 | 102 | 79 | 343 | 42 | 97 | 16 | 2 | 3 | 31 | 5 | 12 | 31 | 24 | .283 | .347 | .367 | .714 | -0.6 |
| Roger Osborne | 2018-2022 | 157 | 99 | 397 | 55 | 105 | 18 | 1 | 11 | 47 | 0 | 0 | 49 | 97 | .264 | .348 | .398 | .746 | -0.5 |
| Wesley Osborne | 2017-2017 | 105 | 103 | 356 | 60 | 83 | 13 | 4 | 10 | 55 | 3 | 2 | 67 | 84 | .233 | .356 | .376 | .732 | -0.9 |
