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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chris O'Brien | 2019-2020 | 20 | 11 | 42 | 5 | 8 | 3 | 0 | 0 | 3 | 0 | 0 | 6 | 9 | .190 | .306 | .262 | .568 | 0.1 |
| Peter O'Brien | 2017-2022 | 287 | 221 | 888 | 87 | 192 | 49 | 2 | 32 | 107 | 1 | 3 | 36 | 299 | .216 | .251 | .384 | .635 | -0.2 |
| Justin O'Conner | 2016-2024 | 930 | 911 | 3246 | 344 | 701 | 166 | 4 | 104 | 368 | 0 | 1 | 222 | 1002 | .216 | .270 | .366 | .635 | 8.2 |
| Dave O'Reilly | 2025-2025 | 130 | 130 | 511 | 64 | 115 | 26 | 6 | 5 | 45 | 26 | 4 | 35 | 99 | .225 | .283 | .329 | .612 | 1.8 |
| Joe O'Rourke | 2024-2025 | 4 | 2 | 7 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 | .143 | .333 | .143 | .476 | -0.0 |
| Rougned Odor | 2015-2021 | 713 | 637 | 2568 | 296 | 659 | 118 | 23 | 52 | 280 | 52 | 16 | 135 | 382 | .257 | .303 | .381 | .684 | 7.4 |
| Ryosuke Ogata | 2019-2025 | 1085 | 1074 | 4118 | 643 | 1103 | 179 | 27 | 121 | 504 | 68 | 46 | 634 | 718 | .268 | .370 | .413 | .783 | 19.7 |
| Tsurayuki Ohayashi | 2024-2025 | 175 | 171 | 584 | 85 | 147 | 29 | 4 | 18 | 62 | 25 | 4 | 90 | 113 | .252 | .350 | .408 | .758 | 3.5 |
| Chris Okey | 2024-2025 | 112 | 102 | 334 | 39 | 66 | 11 | 1 | 2 | 37 | 0 | 0 | 45 | 103 | .198 | .297 | .254 | .552 | 0.4 |
| Albert Oliva | 2024-2024 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | .000 | .000 | .000 | 0.0 |
| Hector Olivera | 2015-2021 | 165 | 159 | 573 | 59 | 135 | 22 | 5 | 7 | 59 | 12 | 3 | 52 | 93 | .236 | .298 | .328 | .627 | 0.4 |
| Cristian Olivo | 2025-2025 | 2 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | .000 | .000 | .000 | -0.0 |
| Matt Olson | 2018-2025 | 935 | 897 | 3263 | 468 | 764 | 195 | 6 | 121 | 376 | 4 | 5 | 527 | 904 | .234 | .348 | .409 | .757 | 13.7 |
| Demi Orimoloye | 2021-2025 | 281 | 261 | 996 | 120 | 233 | 41 | 4 | 45 | 112 | 16 | 5 | 71 | 295 | .234 | .297 | .419 | .716 | 0.5 |
| David Ortiz | 2015-2016 | 187 | 164 | 641 | 74 | 156 | 32 | 2 | 26 | 87 | 1 | 2 | 89 | 132 | .243 | .332 | .421 | .754 | 1.3 |
| Sikes Orvis | 2019-2019 | 43 | 40 | 158 | 11 | 39 | 9 | 2 | 1 | 22 | 0 | 1 | 7 | 34 | .247 | .286 | .348 | .634 | -0.4 |
| Jose Osuna | 2017-2025 | 854 | 814 | 3118 | 386 | 794 | 182 | 10 | 74 | 369 | 4 | 8 | 371 | 589 | .255 | .336 | .391 | .726 | -2.3 |
| Shohei Otani | 2019-2025 | 967 | 938 | 3578 | 462 | 980 | 177 | 32 | 77 | 381 | 107 | 48 | 363 | 738 | .274 | .343 | .406 | .748 | 7.2 |
| Brenden Overton | 2023-2025 | 24 | 19 | 71 | 8 | 15 | 6 | 0 | 1 | 6 | 0 | 0 | 8 | 20 | .211 | .296 | .338 | .634 | -0.2 |
| Chris Owings | 2015-2018 | 203 | 190 | 641 | 83 | 162 | 35 | 6 | 8 | 63 | 15 | 4 | 15 | 175 | .253 | .286 | .363 | .650 | 2.1 |
| Marcell Ozuna | 2016-2025 | 1381 | 1364 | 5532 | 684 | 1432 | 303 | 27 | 219 | 853 | 25 | 12 | 343 | 1370 | .259 | .309 | .442 | .751 | 24.6 |
