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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Michael O'Dowd | 2022-2024 | 15 | 14 | .517 | 3.08 | 121 | 0 | 0 | 0 | 23 | 158.0 | 144 | 54 | 17 | 77 | 153 |
| Patty O'Furniture | 2039-2043 | 10 | 10 | .500 | 3.87 | 153 | 0 | 0 | 0 | 21 | 211.2 | 236 | 91 | 26 | 95 | 167 |
| Huck O'Hara | 2049-2053 | 15 | 23 | .395 | 3.68 | 162 | 0 | 0 | 0 | 30 | 235.0 | 225 | 96 | 22 | 79 | 178 |
| Quentin O'Quarters | 2047-2048 | 10 | 6 | .625 | 2.17 | 77 | 0 | 0 | 0 | 30 | 137.0 | 98 | 33 | 8 | 49 | 139 |
| Ryan O'Reilly | 2043-2044 | 8 | 6 | .571 | 4.84 | 55 | 27 | 0 | 0 | 2 | 161.2 | 187 | 87 | 25 | 73 | 118 |
| Man O'Rite | 2049-2051 | 19 | 18 | .514 | 4.96 | 65 | 56 | 0 | 0 | 0 | 321.1 | 374 | 177 | 54 | 101 | 231 |
| "Big Rig" Tig O'Sullivan | 2042-2043 | 14 | 8 | .636 | 2.63 | 97 | 0 | 0 | 0 | 16 | 164.1 | 121 | 48 | 15 | 58 | 184 |
| Cillian O'Sullivan | 2027-2028 | 9 | 11 | .450 | 5.34 | 34 | 34 | 0 | 0 | 0 | 182.0 | 219 | 108 | 26 | 75 | 105 |
| Flaming O'ter | 2021-2063 | 63 | 53 | .543 | 4.35 | 892 | 0 | 0 | 0 | 50 | 1346.1 | 1459 | 651 | 142 | 678 | 960 |
| Barack Obama | 2028-2029 | 16 | 23 | .410 | 4.51 | 67 | 67 | 0 | 0 | 0 | 345.0 | 389 | 173 | 34 | 95 | 233 |
| Jake Obermueller | 2040-2042 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 1 | 0 | 0 | 0 | 0 |
| Acardboardcutout Ofmarianorivera | 2040-2046 | 9 | 3 | .750 | 3.73 | 130 | 0 | 0 | 0 | 7 | 188.0 | 203 | 78 | 18 | 72 | 160 |
| Bewear OfStrikes | 2054-2058 | 20 | 23 | .465 | 4.46 | 206 | 0 | 0 | 0 | 20 | 357.0 | 394 | 177 | 42 | 131 | 280 |
| Tomo Ohka | 2037-2039 | 1 | 0 | 1.000 | 3.18 | 13 | 0 | 0 | 0 | 0 | 17.0 | 15 | 6 | 4 | 9 | 14 |
| Hiro Ohno | 2036-2040 | 8 | 7 | .533 | 4.90 | 76 | 0 | 0 | 0 | 13 | 108.1 | 117 | 59 | 20 | 52 | 97 |
| Shohei Ohtani | 2055-2056 | 11 | 18 | .379 | 5.24 | 54 | 54 | 0 | 0 | 0 | 261.0 | 315 | 152 | 42 | 116 | 161 |
| Mamoru Okonomi | 2026-2026 | 2 | 6 | .250 | 3.39 | 46 | 0 | 0 | 0 | 3 | 71.2 | 76 | 27 | 8 | 16 | 67 |
| Alex Olaf | 2024-2028 | 8 | 3 | .727 | 4.52 | 64 | 0 | 0 | 0 | 2 | 127.1 | 147 | 64 | 13 | 57 | 76 |
| Scotty Omega | 2038-2039 | 6 | 6 | .500 | 3.56 | 60 | 0 | 0 | 0 | 25 | 98.2 | 90 | 39 | 13 | 40 | 93 |
| Luna José RodrÃguez Ortiz | 2058-2060 | 21 | 16 | .568 | 3.70 | 79 | 54 | 0 | 0 | 4 | 306.2 | 304 | 126 | 25 | 95 | 152 |
| Russell Osborne | 2046-2050 | 22 | 32 | .407 | 5.89 | 142 | 79 | 0 | 0 | 3 | 465.2 | 614 | 305 | 52 | 198 | 253 |
| Yeoj Ottov | 2048-2049 | 8 | 14 | .364 | 3.81 | 91 | 0 | 0 | 0 | 22 | 184.1 | 203 | 78 | 15 | 69 | 151 |
| Jeronimo Ovechkin | 2053-2055 | 11 | 33 | .250 | 5.45 | 75 | 75 | 0 | 0 | 0 | 358.2 | 453 | 217 | 39 | 146 | 182 |
| Michael Oxhard | 2023-2026 | 15 | 9 | .625 | 4.44 | 102 | 15 | 0 | 0 | 5 | 243.1 | 272 | 120 | 29 | 83 | 169 |
