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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gerald O'Collins | 2026-2027 | 20 | 3 | 22 | 2 | 5 | 2 | 0 | 0 | 3 | 0 | 0 | 1 | 7 | .227 | .250 | .318 | .568 | 0.1 |
| William O'Keefe | 2026-2027 | 18 | 18 | 61 | 8 | 22 | 3 | 0 | 1 | 8 | 0 | 0 | 14 | 13 | .361 | .468 | .459 | .927 | 1.2 |
| Dale O'Sullivan | 2020-2020 | 86 | 83 | 304 | 35 | 62 | 10 | 3 | 2 | 25 | 2 | 1 | 34 | 75 | .204 | .299 | .276 | .575 | 0.3 |
| Robert Emmet Odlum | 2024-2024 | 16 | 14 | 47 | 6 | 14 | 2 | 1 | 0 | 4 | 2 | 0 | 4 | 6 | .298 | .346 | .383 | .729 | 0.6 |
| Hirohisa Ogasawara | 2027-2027 | 18 | 18 | 59 | 8 | 17 | 2 | 1 | 0 | 4 | 0 | 0 | 1 | 19 | .288 | .311 | .356 | .667 | 0.4 |
| Tom Oglander | 2022-2023 | 151 | 121 | 377 | 43 | 77 | 12 | 0 | 0 | 22 | 6 | 4 | 54 | 77 | .204 | .312 | .236 | .548 | 1.5 |
| Akihiko Oike | 2026-2026 | 2 | 0 | 3 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 2 | .333 | .500 | .333 | .833 | 0.0 |
| Takechi Okubo | 2026-2027 | 121 | 121 | 398 | 39 | 102 | 19 | 2 | 16 | 57 | 0 | 2 | 58 | 110 | .256 | .349 | .435 | .784 | 5.7 |
| Luis Oliva | 2027-2028 | 77 | 53 | 217 | 9 | 53 | 6 | 1 | 3 | 18 | 1 | 0 | 30 | 59 | .244 | .339 | .323 | .661 | 2.4 |
| José Orihvela | 2026-2028 | 67 | 58 | 230 | 23 | 66 | 8 | 5 | 2 | 22 | 14 | 7 | 13 | 32 | .287 | .322 | .391 | .714 | 1.8 |
| Carlos Ortega | 2026-2026 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | .000 | 1.000 | .000 | 1.000 | 0.1 |
| David Ortega | 2020-2022 | 102 | 76 | 260 | 18 | 65 | 5 | 0 | 4 | 23 | 9 | 5 | 16 | 68 | .250 | .295 | .315 | .611 | -0.4 |
| Jesús Ortíz | 2022-2023 | 13 | 12 | 40 | 1 | 7 | 0 | 0 | 0 | 2 | 0 | 0 | 1 | 18 | .175 | .195 | .175 | .370 | -0.5 |
| José Ortíz | 2027-2027 | 35 | 0 | 31 | 2 | 6 | 0 | 0 | 0 | 2 | 0 | 0 | 4 | 13 | .194 | .286 | .194 | .479 | -0.0 |
| José Antonio Ortíz | 2026-2026 | 4 | 0 | 4 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | .250 | .500 | .500 | 1.000 | 0.1 |
| Sergio Ortíz | 2020-2020 | 96 | 96 | 380 | 35 | 95 | 21 | 0 | 4 | 49 | 0 | 0 | 34 | 76 | .250 | .317 | .337 | .654 | 2.4 |
| Tony Ortíz | 2021-2023 | 144 | 72 | 314 | 29 | 73 | 12 | 1 | 7 | 37 | 9 | 10 | 40 | 84 | .232 | .323 | .344 | .667 | 1.5 |
| Steve Orwig | 2027-2028 | 156 | 152 | 529 | 49 | 98 | 19 | 8 | 7 | 42 | 16 | 7 | 35 | 166 | .185 | .245 | .291 | .536 | 2.6 |
| Jon Osterman | 2027-2027 | 15 | 15 | 50 | 4 | 15 | 4 | 0 | 4 | 6 | 4 | 2 | 2 | 15 | .300 | .327 | .620 | .947 | 1.0 |
| Juan Otero | 2020-2020 | 24 | 24 | 85 | 11 | 28 | 6 | 0 | 2 | 12 | 0 | 0 | 3 | 20 | .329 | .344 | .471 | .815 | 0.6 |
| Peter Ough | 2028-2028 | 70 | 69 | 237 | 22 | 56 | 14 | 2 | 0 | 14 | 11 | 3 | 18 | 45 | .236 | .289 | .312 | .601 | 2.4 |
| Everton Oulton | 2028-2028 | 2 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | .000 | .000 | .000 | .000 | -0.0 |
| Matt Ouweneel | 2028-2028 | 12 | 11 | 41 | 4 | 10 | 5 | 0 | 0 | 4 | 1 | 0 | 8 | 14 | .244 | .360 | .366 | .726 | 0.4 |
