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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gabe O'Connor | 2029-2041 | 30 | 41 | .423 | 3.12 | 507 | 2 | 0 | 0 | 169 | 661.0 | 620 | 229 | 49 | 175 | 727 |
| Dan O'Keeffe | 2030-2041 | 138 | 122 | .531 | 3.49 | 350 | 350 | 52 | 15 | 0 | 2437.0 | 2427 | 944 | 168 | 335 | 2253 |
| Phil O'Sullivan | 2018-2021 | 8 | 30 | .211 | 5.62 | 65 | 47 | 2 | 0 | 0 | 312.1 | 385 | 195 | 50 | 119 | 170 |
| Willie Ochoa | 2022-2023 | 1 | 0 | 1.000 | 5.65 | 13 | 0 | 0 | 0 | 0 | 14.1 | 11 | 9 | 0 | 8 | 7 |
| Jon Ogden | 2035-2041 | 16 | 15 | .516 | 3.43 | 132 | 41 | 0 | 0 | 3 | 362.0 | 319 | 138 | 41 | 111 | 442 |
| Billy Olivares | 2026-2029 | 5 | 42 | .106 | 7.02 | 63 | 63 | 2 | 0 | 0 | 320.1 | 446 | 250 | 54 | 125 | 204 |
| Angel Olmedo | 2019-2021 | 1 | 0 | 1.000 | 4.05 | 9 | 1 | 0 | 0 | 0 | 20.0 | 21 | 9 | 0 | 14 | 16 |
| Matt Olson | 2018-2018 | 0 | 0 | .000 | 13.50 | 3 | 0 | 0 | 0 | 0 | 1.1 | 3 | 2 | 1 | 1 | 1 |
| Alex Ornelas | 2024-2035 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 1 | 1 |
| Mike Orr | 2035-2041 | 47 | 35 | .573 | 4.22 | 186 | 96 | 6 | 4 | 0 | 738.1 | 796 | 346 | 65 | 211 | 805 |
| Gabe Ortiz | 2018-2019 | 20 | 23 | .465 | 4.37 | 73 | 61 | 5 | 4 | 0 | 379.1 | 412 | 184 | 42 | 61 | 227 |
| Jose Osuna | 2023-2029 | 20 | 20 | .500 | 4.41 | 384 | 0 | 0 | 0 | 38 | 346.2 | 360 | 170 | 52 | 96 | 426 |
| Jason Ottem | 2022-2025 | 2 | 0 | 1.000 | 5.76 | 46 | 0 | 0 | 0 | 1 | 45.1 | 66 | 29 | 7 | 25 | 27 |
