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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Peter O'Brien | 2020-2020 | 6 | 6 | 24 | 6 | 9 | 2 | 1 | 3 | 11 | 0 | 0 | 5 | 7 | .375 | .483 | .917 | 1.399 | 0.4 |
| Justin O'Conner | 2014-2015 | 53 | 52 | 196 | 20 | 44 | 5 | 0 | 6 | 26 | 0 | 0 | 12 | 59 | .224 | .276 | .342 | .618 | -0.6 |
| Chris O'Dowd | 2018-2018 | 28 | 28 | 106 | 19 | 31 | 10 | 0 | 2 | 11 | 1 | 0 | 17 | 24 | .292 | .400 | .443 | .843 | 0.4 |
| Brian O'Grady | 2019-2026 | 186 | 180 | 655 | 133 | 163 | 25 | 3 | 50 | 138 | 26 | 14 | 123 | 173 | .249 | .373 | .525 | .899 | 2.4 |
| Logan O'Hoppe | 2022-2022 | 56 | 54 | 204 | 37 | 71 | 8 | 1 | 13 | 39 | 1 | 0 | 25 | 22 | .348 | .427 | .588 | 1.016 | 2.0 |
| Brian O'Keefe | 2020-2022 | 132 | 126 | 507 | 78 | 136 | 17 | 0 | 24 | 84 | 1 | 3 | 62 | 130 | .268 | .357 | .444 | .801 | -0.3 |
| Matt O'Neill | 2024-2024 | 34 | 30 | 98 | 10 | 22 | 2 | 0 | 1 | 10 | 0 | 0 | 15 | 38 | .224 | .356 | .276 | .631 | -0.0 |
| Tyler O'Neill | 2017-2018 | 111 | 111 | 458 | 84 | 150 | 28 | 3 | 37 | 115 | 5 | 9 | 57 | 120 | .328 | .398 | .644 | 1.042 | 4.2 |
| Dylan O'Rae | 2026-2026 | 7 | 7 | 31 | 6 | 8 | 1 | 0 | 1 | 3 | 2 | 1 | 5 | 7 | .258 | .361 | .387 | .748 | -0.1 |
| Josh Ockimey | 2019-2021 | 36 | 35 | 129 | 21 | 28 | 5 | 0 | 5 | 18 | 0 | 0 | 27 | 40 | .217 | .352 | .372 | .724 | -0.3 |
| Keshawn Ogans | 2026-2026 | 24 | 24 | 94 | 12 | 22 | 3 | 1 | 0 | 8 | 1 | 0 | 6 | 20 | .234 | .301 | .287 | .588 | -0.3 |
| Chris Okey | 2019-2023 | 73 | 70 | 249 | 46 | 68 | 10 | 1 | 17 | 56 | 0 | 3 | 33 | 61 | .273 | .365 | .526 | .891 | 0.5 |
| Jared Oliva | 2021-2026 | 97 | 94 | 378 | 59 | 108 | 23 | 5 | 13 | 60 | 8 | 12 | 34 | 76 | .286 | .350 | .476 | .826 | 0.7 |
| Alexis Olmeda | 2016-2019 | 39 | 37 | 136 | 19 | 36 | 5 | 0 | 4 | 24 | 0 | 0 | 17 | 39 | .265 | .350 | .390 | .740 | -0.1 |
| Johnny Olmstead | 2025-2026 | 96 | 92 | 371 | 65 | 113 | 13 | 6 | 13 | 66 | 8 | 3 | 35 | 50 | .305 | .369 | .477 | .846 | 0.5 |
| Matt Olson | 2016-2016 | 138 | 138 | 545 | 102 | 145 | 40 | 1 | 20 | 104 | 4 | 3 | 97 | 148 | .266 | .377 | .453 | .830 | 2.3 |
| Mike Olt | 2017-2019 | 55 | 36 | 145 | 21 | 35 | 6 | 1 | 9 | 28 | 1 | 0 | 24 | 45 | .241 | .349 | .483 | .832 | 0.0 |
| Jorge Ona | 2022-2022 | 5 | 3 | 14 | 3 | 3 | 0 | 0 | 2 | 5 | 0 | 0 | 2 | 5 | .214 | .312 | .643 | .955 | 0.1 |
| Demi Orimoloye | 2020-2020 | 105 | 104 | 384 | 87 | 107 | 20 | 6 | 17 | 80 | 35 | 5 | 63 | 100 | .279 | .386 | .495 | .881 | 1.1 |
| Jonathan Ornelas | 2023-2023 | 99 | 99 | 349 | 56 | 107 | 17 | 1 | 16 | 62 | 2 | 4 | 29 | 70 | .307 | .359 | .499 | .858 | 2.1 |
| Tirso Ornelas | 2024-2025 | 93 | 91 | 362 | 63 | 103 | 17 | 3 | 15 | 58 | 13 | 10 | 52 | 55 | .285 | .379 | .472 | .851 | -0.2 |
| Rafael Ortega | 2015-2019 | 282 | 274 | 1100 | 184 | 309 | 51 | 7 | 13 | 121 | 43 | 24 | 168 | 150 | .281 | .384 | .375 | .760 | 2.8 |
| Alejandro Osuna | 2025-2025 | 74 | 68 | 262 | 60 | 80 | 13 | 1 | 20 | 72 | 16 | 11 | 37 | 59 | .305 | .396 | .592 | .988 | 1.1 |
| Jose Osuna | 2017-2021 | 120 | 114 | 499 | 91 | 168 | 30 | 4 | 22 | 105 | 1 | 2 | 54 | 101 | .337 | .401 | .545 | .946 | 2.8 |
| Hunter Owen | 2020-2023 | 178 | 155 | 640 | 110 | 164 | 15 | 1 | 49 | 145 | 2 | 4 | 60 | 173 | .256 | .322 | .512 | .835 | -0.1 |
| Chris Owings | 2021-2023 | 49 | 49 | 179 | 32 | 45 | 4 | 1 | 10 | 36 | 5 | 4 | 28 | 47 | .251 | .351 | .453 | .803 | 0.8 |
