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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 | 2016-2021 | 448 | 433 | 1811 | 341 | 523 | 82 | 16 | 156 | 441 | 8 | 9 | 181 | 462 | .289 | .353 | .610 | .963 | 7.0 |
| Chris O'Dowd | 2018-2018 | 18 | 12 | 43 | 10 | 12 | 3 | 1 | 1 | 4 | 1 | 0 | 5 | 15 | .279 | .347 | .465 | .812 | 0.1 |
| Brian O'Grady | 2020-2025 | 485 | 451 | 1744 | 342 | 462 | 98 | 12 | 121 | 361 | 62 | 32 | 236 | 484 | .265 | .355 | .543 | .898 | 9.8 |
| Ryan O'Hearn | 2018-2023 | 324 | 308 | 1204 | 213 | 333 | 76 | 3 | 78 | 254 | 2 | 4 | 177 | 239 | .277 | .366 | .539 | .905 | 3.9 |
| Shawn O'Malley | 2015-2015 | 31 | 31 | 126 | 14 | 43 | 6 | 1 | 0 | 13 | 5 | 0 | 6 | 18 | .341 | .385 | .405 | .790 | 1.0 |
| Mike O'Neill | 2013-2017 | 430 | 400 | 1445 | 226 | 437 | 68 | 8 | 14 | 191 | 33 | 23 | 192 | 206 | .302 | .400 | .390 | .790 | 3.6 |
| Josh Ockimey | 2020-2020 | 98 | 94 | 330 | 73 | 98 | 23 | 0 | 21 | 72 | 0 | 0 | 79 | 84 | .297 | .428 | .558 | .986 | 2.3 |
| Rougned Odor | 2015-2020 | 169 | 163 | 722 | 136 | 243 | 48 | 7 | 36 | 126 | 21 | 13 | 61 | 105 | .337 | .386 | .572 | .958 | 6.5 |
| Chris Okey | 2024-2024 | 24 | 18 | 71 | 6 | 14 | 2 | 0 | 1 | 5 | 0 | 1 | 4 | 15 | .197 | .240 | .268 | .508 | -0.3 |
| Edward Olivares | 2020-2025 | 269 | 251 | 977 | 141 | 264 | 39 | 3 | 38 | 130 | 38 | 10 | 89 | 151 | .270 | .334 | .433 | .767 | 0.6 |
| Pablo Olivares | 2024-2024 | 11 | 7 | 25 | 4 | 10 | 3 | 0 | 0 | 5 | 0 | 0 | 3 | 3 | .400 | .464 | .520 | .984 | 0.0 |
| Hector Olivera | 2017-2019 | 283 | 279 | 1129 | 202 | 372 | 47 | 4 | 57 | 212 | 17 | 8 | 108 | 169 | .329 | .398 | .530 | .928 | 3.3 |
| Alexis Olmeda | 2019-2019 | 7 | 6 | 24 | 1 | 4 | 0 | 0 | 1 | 2 | 0 | 0 | 3 | 6 | .167 | .259 | .292 | .551 | -0.2 |
| Johnny Olmstead | 2025-2025 | 41 | 40 | 148 | 12 | 37 | 5 | 0 | 2 | 13 | 1 | 4 | 8 | 18 | .250 | .292 | .324 | .616 | -1.2 |
| Matt Olson | 2017-2017 | 36 | 36 | 139 | 37 | 45 | 7 | 0 | 12 | 31 | 0 | 1 | 32 | 30 | .324 | .453 | .633 | 1.087 | 1.5 |
| Mike Olt | 2013-2015 | 69 | 65 | 265 | 46 | 71 | 6 | 1 | 17 | 57 | 2 | 0 | 23 | 67 | .268 | .336 | .491 | .826 | 1.0 |
| Shane Opitz | 2018-2018 | 5 | 3 | 15 | 3 | 3 | 1 | 1 | 0 | 2 | 0 | 0 | 2 | 2 | .200 | .278 | .400 | .678 | -0.0 |
| Jonathan Ornelas | 2025-2025 | 20 | 19 | 70 | 8 | 23 | 2 | 1 | 0 | 10 | 0 | 0 | 4 | 11 | .329 | .372 | .386 | .758 | 0.0 |
| J.D. Orr | 2023-2023 | 79 | 77 | 305 | 37 | 71 | 11 | 0 | 0 | 19 | 21 | 14 | 31 | 64 | .233 | .305 | .269 | .574 | -1.5 |
| Jorel Ortega | 2023-2023 | 35 | 25 | 90 | 14 | 23 | 2 | 2 | 4 | 9 | 1 | 1 | 3 | 21 | .256 | .287 | .456 | .743 | 0.1 |
| Rafael Ortega | 2024-2025 | 53 | 39 | 152 | 23 | 38 | 6 | 0 | 3 | 19 | 7 | 4 | 28 | 24 | .250 | .367 | .349 | .715 | -0.5 |
| Danny Ortiz | 2016-2017 | 46 | 45 | 197 | 18 | 62 | 8 | 1 | 7 | 36 | 3 | 1 | 8 | 24 | .315 | .354 | .472 | .826 | 0.5 |
| Ryan Ortiz | 2016-2016 | 17 | 17 | 62 | 6 | 17 | 3 | 0 | 1 | 8 | 0 | 0 | 6 | 10 | .274 | .338 | .371 | .709 | 0.1 |
| Jose Osuna | 2016-2016 | 8 | 8 | 27 | 8 | 8 | 4 | 0 | 1 | 3 | 1 | 0 | 2 | 5 | .296 | .367 | .556 | .922 | 0.1 |
| Sharif Othman | 2017-2018 | 13 | 12 | 37 | 10 | 16 | 3 | 0 | 2 | 12 | 0 | 0 | 9 | 5 | .432 | .521 | .676 | 1.197 | 0.7 |
| Adam Ottavino | 2009-2016 | 62 | 19 | 70 | 3 | 11 | 0 | 0 | 0 | 6 | 0 | 0 | 6 | 32 | .157 | .224 | .157 | .381 | -0.9 |
| Chris Owings | 2014-2025 | 583 | 555 | 2123 | 342 | 597 | 95 | 12 | 77 | 315 | 63 | 28 | 216 | 476 | .281 | .350 | .446 | .796 | 8.9 |
| Marcell Ozuna | 2014-2016 | 135 | 133 | 581 | 104 | 173 | 26 | 4 | 31 | 100 | 0 | 1 | 45 | 105 | .298 | .348 | .516 | .864 | 2.6 |
