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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Devin O'Brien | 2024-2031 | 40 | 30 | .571 | 3.97 | 196 | 79 | 1 | 0 | 8 | 730.1 | 652 | 322 | 95 | 307 | 694 |
| Joe O'Brien | 2021-2021 | 1 | 1 | .500 | 15.43 | 4 | 0 | 0 | 0 | 0 | 2.1 | 5 | 4 | 3 | 1 | 3 |
| Gabe O'Connor | 2029-2039 | 12 | 12 | .500 | 2.06 | 136 | 0 | 0 | 0 | 82 | 153.0 | 105 | 35 | 6 | 49 | 174 |
| Ben O'Daniell | 2031-2034 | 32 | 17 | .653 | 2.92 | 138 | 52 | 0 | 0 | 4 | 455.2 | 368 | 148 | 53 | 98 | 471 |
| Jim O'Donnell | 2025-2027 | 3 | 2 | .600 | 3.86 | 30 | 1 | 0 | 0 | 0 | 65.1 | 64 | 28 | 6 | 27 | 57 |
| Grant O'Halloran | 2018-2022 | 0 | 0 | .000 | 22.50 | 2 | 0 | 0 | 0 | 0 | 2.0 | 3 | 5 | 0 | 6 | 0 |
| Dan O'Keeffe | 2029-2030 | 16 | 4 | .800 | 3.57 | 33 | 33 | 0 | 0 | 0 | 184.0 | 203 | 73 | 17 | 47 | 157 |
| Corcoran O'Sullivan | 2033-2034 | 10 | 9 | .526 | 4.03 | 68 | 23 | 0 | 0 | 2 | 183.0 | 164 | 82 | 28 | 58 | 211 |
| Phil O'Sullivan | 2019-2021 | 8 | 16 | .333 | 5.13 | 36 | 36 | 1 | 1 | 0 | 203.2 | 197 | 116 | 33 | 68 | 159 |
| Willie Ochoa | 2018-2024 | 56 | 43 | .566 | 4.01 | 264 | 115 | 1 | 0 | 10 | 866.1 | 863 | 386 | 86 | 315 | 693 |
| Jon Ogden | 2038-2041 | 25 | 21 | .543 | 3.20 | 87 | 86 | 1 | 0 | 0 | 424.2 | 369 | 151 | 39 | 136 | 459 |
| Steve Ogilvie | 2039-2041 | 23 | 15 | .605 | 2.88 | 78 | 62 | 0 | 0 | 0 | 399.2 | 287 | 128 | 37 | 156 | 457 |
| Ricky Ojeda | 2023-2025 | 1 | 2 | .333 | 5.77 | 43 | 0 | 0 | 0 | 0 | 48.1 | 52 | 31 | 3 | 34 | 34 |
| Billy Olivares | 2023-2030 | 15 | 24 | .385 | 4.74 | 126 | 60 | 2 | 1 | 3 | 411.2 | 426 | 217 | 51 | 139 | 349 |
| Bill Olivera | 2018-2019 | 4 | 2 | .667 | 3.93 | 30 | 9 | 0 | 0 | 0 | 71.0 | 63 | 31 | 9 | 42 | 81 |
| Angel Olmedo | 2018-2022 | 19 | 25 | .432 | 4.74 | 91 | 63 | 0 | 0 | 2 | 357.0 | 361 | 188 | 45 | 140 | 353 |
| Chase Olson | 2028-2030 | 3 | 1 | .750 | 3.00 | 42 | 0 | 0 | 0 | 1 | 63.0 | 62 | 21 | 5 | 19 | 29 |
| Jeffrey Olson | 2022-2023 | 3 | 0 | 1.000 | 3.86 | 28 | 0 | 0 | 0 | 1 | 32.2 | 34 | 14 | 2 | 24 | 36 |
| Matt Olson | 2018-2019 | 8 | 7 | .533 | 4.27 | 97 | 0 | 0 | 0 | 6 | 124.1 | 132 | 59 | 13 | 49 | 123 |
| Hee-seop On | 2024-2028 | 7 | 15 | .318 | 4.65 | 148 | 0 | 0 | 0 | 46 | 147.0 | 128 | 76 | 16 | 90 | 156 |
| Roberto Ornelas | 2018-2019 | 5 | 8 | .385 | 3.97 | 22 | 22 | 0 | 0 | 0 | 131.1 | 128 | 58 | 15 | 57 | 96 |
| Nelson Orona | 2027-2031 | 8 | 7 | .533 | 2.92 | 175 | 0 | 0 | 0 | 8 | 169.2 | 137 | 55 | 13 | 52 | 147 |
| Ivan Orozco | 2037-2037 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 0 | 1 |
| Mike Orr | 2034-2037 | 42 | 15 | .737 | 2.54 | 82 | 68 | 4 | 3 | 4 | 478.2 | 380 | 135 | 36 | 125 | 546 |
| Miguel Ortega | 2018-2022 | 0 | 0 | .000 | 27.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 3 | 1 | 1 | 2 |
| Chris Ostrander | 2022-2023 | 7 | 4 | .636 | 5.57 | 83 | 0 | 0 | 0 | 4 | 114.2 | 143 | 71 | 14 | 55 | 89 |
| Jose Osuna | 2029-2030 | 7 | 5 | .583 | 2.49 | 60 | 0 | 0 | 0 | 11 | 72.1 | 61 | 20 | 9 | 16 | 95 |
| Jason Ottem | 2020-2031 | 0 | 1 | .000 | 11.12 | 9 | 0 | 0 | 0 | 1 | 5.2 | 7 | 7 | 1 | 7 | 5 |
| Joe Outlaw | 2021-2027 | 0 | 0 | .000 | 4.91 | 3 | 0 | 0 | 0 | 0 | 3.2 | 4 | 2 | 0 | 0 | 5 |
| Dave Owens | 2018-2022 | 13 | 10 | .565 | 4.41 | 173 | 11 | 0 | 0 | 3 | 189.2 | 183 | 93 | 22 | 68 | 193 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Rick Owens | 2034-2036 | 10 | 5 | .667 | 4.61 | 138 | 1 | 0 | 0 | 2 | 222.2 | 201 | 114 | 53 | 55 | 317 |
