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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lucio O Cuaig | 2034-2038 | 0 | 0 | .000 | 13.50 | 2 | 0 | 0 | 0 | 0 | 0.2 | 1 | 1 | 0 | 3 | 0 |
| Michael O'Dowd | 2020-2027 | 7 | 7 | .500 | 5.04 | 101 | 0 | 0 | 0 | 12 | 94.2 | 92 | 53 | 14 | 68 | 71 |
| Quentin O'Quarters | 2049-2062 | 113 | 100 | .531 | 3.64 | 474 | 216 | 9 | 5 | 46 | 1761.0 | 1608 | 713 | 211 | 433 | 1777 |
| Man O'Rite | 2052-2062 | 120 | 67 | .642 | 3.72 | 368 | 216 | 5 | 0 | 34 | 1651.2 | 1523 | 683 | 194 | 412 | 1696 |
| "Big Rig" Tig O'Sullivan | 2044-2056 | 105 | 66 | .614 | 3.58 | 456 | 162 | 1 | 1 | 36 | 1440.1 | 1246 | 573 | 170 | 494 | 1610 |
| Cillian O'Sullivan | 2029-2041 | 80 | 84 | .488 | 4.49 | 433 | 171 | 5 | 2 | 45 | 1444.0 | 1434 | 720 | 195 | 490 | 1110 |
| Julian O'Sullivan | 2017-2033 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 1 | 0 |
| Kristy O'Sullivan | 2017-2018 | 22 | 21 | .512 | 3.62 | 49 | 49 | 10 | 2 | 0 | 360.1 | 348 | 145 | 45 | 85 | 279 |
| Steven O'Sullivan | 2017-2027 | 0 | 0 | .000 | 13.50 | 2 | 0 | 0 | 0 | 0 | 0.2 | 2 | 1 | 0 | 2 | 0 |
| Barack Obama | 2030-2040 | 132 | 81 | .620 | 3.58 | 291 | 290 | 24 | 12 | 0 | 1827.0 | 1591 | 727 | 215 | 511 | 1909 |
| Shohei Ohtani | 2057-2062 | 34 | 49 | .410 | 4.37 | 207 | 108 | 0 | 0 | 18 | 752.0 | 769 | 365 | 97 | 257 | 743 |
| Shion Okamoto | 2044-2046 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 |
| Mamoru Okonomi | 2027-2035 | 14 | 18 | .438 | 6.11 | 310 | 0 | 0 | 0 | 51 | 256.1 | 285 | 174 | 50 | 141 | 232 |
| Tyler Oles | 2021-2033 | 107 | 138 | .437 | 4.90 | 322 | 321 | 11 | 4 | 0 | 1962.0 | 2124 | 1069 | 264 | 654 | 1263 |
| Jimmy Olsen | 2043-2051 | 0 | 0 | .000 | 60.75 | 3 | 0 | 0 | 0 | 0 | 1.1 | 3 | 9 | 0 | 9 | 1 |
| Scotty Omega | 2040-2047 | 18 | 28 | .391 | 4.94 | 327 | 0 | 0 | 0 | 36 | 468.0 | 497 | 257 | 91 | 242 | 519 |
| Chris Orosz | 2017-2020 | 8 | 22 | .267 | 4.27 | 154 | 0 | 0 | 0 | 65 | 198.0 | 226 | 94 | 25 | 68 | 199 |
| Luna José RodrÃguez Ortiz | 2061-2062 | 6 | 7 | .462 | 4.13 | 88 | 0 | 0 | 0 | 9 | 128.2 | 103 | 59 | 13 | 62 | 149 |
| Cal Otter | 2033-2038 | 16 | 54 | .229 | 6.50 | 151 | 80 | 5 | 1 | 3 | 553.2 | 647 | 400 | 110 | 263 | 421 |
| Yeoj Ottov | 2050-2062 | 57 | 65 | .467 | 2.92 | 660 | 0 | 0 | 0 | 170 | 994.0 | 782 | 323 | 82 | 376 | 1250 |
| Bobby Outman | 2018-2027 | 25 | 24 | .510 | 4.34 | 260 | 27 | 0 | 0 | 13 | 487.1 | 561 | 235 | 57 | 195 | 329 |
| Alexander Ovechkin | 2017-2022 | 26 | 21 | .553 | 3.22 | 258 | 0 | 0 | 0 | 116 | 310.1 | 302 | 111 | 25 | 96 | 290 |
| Jeronimo Ovechkin | 2056-2062 | 45 | 90 | .333 | 5.41 | 190 | 188 | 2 | 0 | 0 | 1052.0 | 1261 | 632 | 121 | 399 | 741 |
| Michael Oxhard | 2022-2022 | 1 | 0 | 1.000 | 4.71 | 13 | 0 | 0 | 0 | 0 | 21.0 | 25 | 11 | 1 | 9 | 15 |
