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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 | 2022-2024 | 15 | 7 | .682 | 3.09 | 65 | 24 | 0 | 0 | 3 | 233.1 | 216 | 80 | 22 | 82 | 295 |
| Gabe O'Connor | 2029-2029 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 1 | 2.0 | 1 | 0 | 0 | 2 | 1 |
| Ben O'Daniell | 2031-2031 | 0 | 0 | .000 | 3.86 | 2 | 0 | 0 | 0 | 0 | 2.1 | 2 | 1 | 0 | 0 | 1 |
| Andrew O'Donnell | 2034-2041 | 17 | 18 | .486 | 3.56 | 98 | 33 | 4 | 1 | 0 | 328.2 | 261 | 130 | 44 | 67 | 361 |
| Jim O'Donnell | 2023-2025 | 8 | 5 | .615 | 4.50 | 152 | 0 | 0 | 0 | 5 | 200.0 | 199 | 100 | 17 | 107 | 181 |
| Keith O'Donnell | 2038-2038 | 2 | 2 | .500 | 6.48 | 13 | 0 | 0 | 0 | 3 | 16.2 | 14 | 12 | 1 | 13 | 24 |
| Duhan O'Farrell | 2031-2032 | 5 | 18 | .217 | 5.15 | 33 | 25 | 1 | 0 | 0 | 157.1 | 150 | 90 | 17 | 74 | 153 |
| Dan O'Keeffe | 2027-2029 | 21 | 12 | .636 | 3.26 | 43 | 43 | 0 | 0 | 0 | 265.1 | 249 | 96 | 16 | 76 | 214 |
| Adam O'Leary | 2028-2029 | 4 | 3 | .571 | 6.24 | 63 | 0 | 0 | 0 | 0 | 98.0 | 96 | 68 | 7 | 68 | 76 |
| Tyrone O'Loughlin | 2035-2036 | 0 | 0 | .000 | 3.29 | 36 | 0 | 0 | 0 | 0 | 13.2 | 12 | 5 | 1 | 11 | 14 |
| Corcoran O'Sullivan | 2031-2033 | 22 | 21 | .512 | 3.72 | 65 | 65 | 0 | 0 | 0 | 355.1 | 307 | 147 | 38 | 183 | 363 |
| Phil O'Sullivan | 2018-2020 | 11 | 9 | .550 | 3.18 | 30 | 30 | 1 | 0 | 0 | 186.2 | 150 | 66 | 20 | 58 | 191 |
| Jeremy Oberman | 2029-2029 | 1 | 1 | .500 | 3.42 | 10 | 5 | 0 | 0 | 0 | 26.1 | 29 | 10 | 0 | 16 | 15 |
| Cory Obrochta | 2041-2041 | 0 | 1 | .000 | 1.35 | 1 | 1 | 0 | 0 | 0 | 6.2 | 5 | 1 | 0 | 2 | 1 |
| Tim Ocampo | 2041-2041 | 0 | 0 | .000 | 4.26 | 1 | 1 | 0 | 0 | 0 | 6.1 | 4 | 3 | 2 | 2 | 3 |
| Adrian Ochoa | 2021-2025 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 2.1 | 2 | 0 | 0 | 2 | 3 |
| Jon Ogden | 2033-2034 | 16 | 15 | .516 | 3.13 | 40 | 40 | 2 | 1 | 0 | 244.1 | 181 | 85 | 19 | 93 | 269 |
| Steve Ogilvie | 2038-2038 | 11 | 5 | .688 | 3.04 | 18 | 18 | 0 | 0 | 0 | 109.2 | 87 | 37 | 5 | 45 | 103 |
| Ricky Ojeda | 2020-2022 | 12 | 14 | .462 | 3.19 | 69 | 27 | 0 | 0 | 7 | 208.2 | 182 | 74 | 13 | 84 | 150 |
| Jonathan Olander | 2028-2031 | 4 | 6 | .400 | 4.84 | 94 | 1 | 0 | 0 | 4 | 141.1 | 127 | 76 | 15 | 97 | 177 |
| Jeff Olcott | 2037-2038 | 6 | 4 | .600 | 4.43 | 76 | 2 | 0 | 0 | 1 | 138.0 | 136 | 68 | 8 | 103 | 130 |
| Billy Olivares | 2021-2027 | 14 | 8 | .636 | 3.12 | 80 | 29 | 0 | 0 | 2 | 242.0 | 206 | 84 | 18 | 92 | 274 |
| Dave Olivas | 2019-2020 | 0 | 0 | .000 | 17.47 | 6 | 0 | 0 | 0 | 0 | 5.2 | 14 | 11 | 2 | 7 | 5 |
| Bill Olivera | 2018-2019 | 9 | 4 | .692 | 2.97 | 32 | 24 | 1 | 0 | 1 | 145.2 | 119 | 48 | 12 | 43 | 158 |
| Angel Olmedo | 2023-2032 | 11 | 23 | .324 | 6.29 | 281 | 12 | 0 | 0 | 5 | 445.0 | 494 | 311 | 48 | 389 | 415 |
| Chase Olson | 2026-2030 | 2 | 3 | .400 | 4.25 | 75 | 1 | 0 | 0 | 3 | 106.0 | 95 | 50 | 7 | 54 | 73 |
| Chris Olson | 2037-2037 | 1 | 2 | .333 | 2.26 | 33 | 1 | 0 | 0 | 3 | 55.2 | 36 | 14 | 1 | 22 | 51 |
| Jeffrey Olson | 2021-2024 | 4 | 6 | .400 | 3.62 | 90 | 0 | 0 | 0 | 3 | 121.2 | 101 | 49 | 10 | 60 | 130 |
| Matt Olson | 2018-2018 | 1 | 1 | .500 | 2.55 | 16 | 0 | 0 | 0 | 8 | 17.2 | 13 | 5 | 0 | 7 | 22 |
| Hee-seop On | 2022-2032 | 26 | 18 | .591 | 3.00 | 329 | 3 | 1 | 0 | 28 | 459.0 | 337 | 153 | 40 | 199 | 639 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Luke Opperman | 2028-2029 | 0 | 0 | .000 | 27.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 3 | 0 | 2 | 2 |
| Vinny Orantes | 2041-2041 | 7 | 2 | .778 | 1.76 | 69 | 0 | 0 | 0 | 0 | 92.0 | 58 | 18 | 3 | 51 | 98 |
| Roberto Ornelas | 2018-2018 | 3 | 4 | .429 | 4.63 | 9 | 9 | 0 | 0 | 0 | 44.2 | 42 | 23 | 3 | 22 | 32 |
| Nelson Orona | 2026-2026 | 4 | 0 | 1.000 | 1.87 | 48 | 0 | 0 | 0 | 24 | 43.1 | 31 | 9 | 4 | 11 | 46 |
| Mike Orr | 2033-2033 | 15 | 6 | .714 | 2.59 | 28 | 28 | 0 | 0 | 0 | 163.1 | 115 | 47 | 7 | 63 | 202 |
| Tony Ortega | 2038-2038 | 0 | 1 | .000 | 3.80 | 15 | 0 | 0 | 0 | 0 | 23.2 | 26 | 10 | 4 | 12 | 17 |
| Chris Ortiz | 2037-2038 | 0 | 1 | .000 | 4.35 | 10 | 0 | 0 | 0 | 0 | 10.1 | 8 | 5 | 2 | 4 | 11 |
| Jose Ortiz | 2033-2034 | 5 | 0 | 1.000 | 3.72 | 20 | 5 | 0 | 0 | 0 | 46.0 | 40 | 19 | 5 | 16 | 52 |
| Victor Ortiz | 2041-2041 | 1 | 5 | .167 | 4.65 | 7 | 7 | 0 | 0 | 0 | 40.2 | 38 | 21 | 4 | 13 | 49 |
| Chad Osmond | 2038-2041 | 17 | 28 | .378 | 4.30 | 149 | 41 | 0 | 0 | 2 | 431.1 | 383 | 206 | 51 | 216 | 441 |
| Ron Osmond | 2025-2025 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 8.0 | 9 | 0 | 0 | 1 | 9 |
| Chris Ostrander | 2019-2024 | 20 | 26 | .435 | 4.67 | 147 | 50 | 0 | 0 | 1 | 404.2 | 438 | 210 | 29 | 163 | 348 |
| Chris Ouverson | 2025-2027 | 0 | 0 | .000 | 21.60 | 2 | 0 | 0 | 0 | 0 | 1.2 | 5 | 4 | 0 | 1 | 2 |
| Steve Owen | 2025-2025 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 2 | 1 |
| Adan Owens | 2021-2026 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 1 | 0 | 0 | 1 | 2 |
| Rick Owens | 2033-2033 | 4 | 8 | .333 | 4.05 | 41 | 10 | 0 | 0 | 0 | 97.2 | 89 | 44 | 11 | 33 | 122 |
