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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Riley O'Brien | 2020-2020 | 5 | 9 | .357 | 6.25 | 41 | 17 | 0 | 0 | 2 | 112.1 | 114 | 78 | 16 | 77 | 86 |
| Chris O'Grady | 2017-2021 | 12 | 19 | .387 | 4.91 | 53 | 51 | 0 | 0 | 0 | 258.2 | 288 | 141 | 38 | 104 | 198 |
| Sean O'Sullivan | 2015-2018 | 12 | 15 | .444 | 5.38 | 62 | 41 | 0 | 0 | 0 | 261.0 | 325 | 156 | 29 | 124 | 161 |
| Trevor Oaks | 2019-2021 | 6 | 3 | .667 | 6.53 | 54 | 6 | 0 | 0 | 6 | 122.2 | 162 | 89 | 16 | 37 | 50 |
| Bailey Ober | 2023-2024 | 4 | 3 | .571 | 3.71 | 9 | 9 | 0 | 0 | 0 | 60.2 | 60 | 25 | 7 | 9 | 37 |
| Scott Oberg | 2023-2023 | 0 | 1 | .000 | 1.12 | 5 | 0 | 0 | 0 | 0 | 8.0 | 4 | 1 | 1 | 1 | 6 |
| Brett Oberholtzer | 2013-2021 | 47 | 48 | .495 | 4.52 | 296 | 98 | 4 | 1 | 9 | 906.1 | 1002 | 455 | 120 | 251 | 645 |
| Jake Odorizzi | 2013-2014 | 19 | 17 | .528 | 4.91 | 52 | 50 | 2 | 0 | 0 | 298.2 | 316 | 163 | 40 | 117 | 218 |
| Alexi Ogando | 2013-2013 | 6 | 3 | .667 | 3.11 | 10 | 10 | 0 | 0 | 0 | 75.1 | 72 | 26 | 4 | 17 | 52 |
| Nefi Ogando | 2017-2018 | 0 | 1 | .000 | 3.06 | 30 | 0 | 0 | 0 | 9 | 32.1 | 30 | 11 | 2 | 14 | 39 |
| Seung-hwan Oh | 2018-2020 | 5 | 5 | .500 | 3.19 | 81 | 0 | 0 | 0 | 26 | 93.0 | 86 | 33 | 6 | 26 | 83 |
| Ross Ohlendorf | 2013-2016 | 30 | 16 | .652 | 4.76 | 82 | 61 | 1 | 0 | 1 | 397.1 | 414 | 210 | 58 | 152 | 306 |
| Shohei Ohtani | 2023-2023 | 0 | 0 | .000 | 0.73 | 3 | 3 | 0 | 0 | 0 | 12.1 | 5 | 1 | 1 | 3 | 15 |
| Steven Okert | 2018-2022 | 12 | 6 | .667 | 4.62 | 83 | 0 | 0 | 0 | 5 | 120.2 | 126 | 62 | 16 | 55 | 97 |
| Andy Oliver | 2016-2018 | 8 | 8 | .500 | 4.86 | 22 | 21 | 0 | 0 | 0 | 129.2 | 123 | 70 | 11 | 58 | 105 |
| Edgar Olmos | 2014-2015 | 0 | 3 | .000 | 5.46 | 44 | 0 | 0 | 0 | 2 | 61.0 | 64 | 37 | 7 | 37 | 49 |
| Nathan Orf | 2018-2021 | 0 | 0 | .000 | 6.75 | 2 | 0 | 0 | 0 | 0 | 1.1 | 2 | 1 | 0 | 0 | 3 |
| Paulo Orlando | 2014-2020 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 0 | 0 |
| Jose Ortega | 2014-2017 | 9 | 12 | .429 | 4.91 | 195 | 0 | 0 | 0 | 14 | 240.1 | 255 | 131 | 25 | 144 | 250 |
| Oliver Ortega | 2025-2025 | 1 | 3 | .250 | 3.74 | 41 | 0 | 0 | 0 | 2 | 79.1 | 87 | 33 | 10 | 28 | 60 |
| Jesus Ortiz | 2018-2018 | 1 | 4 | .200 | 9.07 | 10 | 10 | 0 | 0 | 0 | 45.2 | 61 | 46 | 7 | 40 | 37 |
| Joseph Ortiz | 2013-2016 | 5 | 2 | .714 | 2.40 | 49 | 0 | 0 | 0 | 0 | 56.1 | 51 | 15 | 5 | 23 | 53 |
| Luis Ortiz | 2021-2025 | 19 | 20 | .487 | 4.94 | 107 | 33 | 1 | 0 | 6 | 320.2 | 353 | 176 | 44 | 117 | 222 |
| Eric Orze | 2022-2022 | 4 | 3 | .571 | 5.17 | 32 | 0 | 0 | 0 | 1 | 47.0 | 42 | 27 | 11 | 14 | 64 |
| Josh Osich | 2015-2018 | 7 | 10 | .412 | 7.12 | 135 | 0 | 0 | 0 | 0 | 187.0 | 233 | 148 | 36 | 99 | 171 |
| Dan Otero | 2017-2020 | 3 | 3 | .500 | 3.84 | 41 | 0 | 0 | 0 | 3 | 65.2 | 64 | 28 | 6 | 7 | 31 |
| Travis Ott | 2019-2020 | 0 | 1 | .000 | 3.86 | 7 | 0 | 0 | 0 | 2 | 14.0 | 11 | 6 | 1 | 8 | 5 |
| Adam Ottavino | 2025-2025 | 0 | 0 | .000 | 15.88 | 5 | 0 | 0 | 0 | 0 | 5.2 | 15 | 10 | 3 | 4 | 4 |
| Connor Overton | 2015-2024 | 3 | 4 | .429 | 5.88 | 16 | 6 | 0 | 0 | 0 | 52.0 | 60 | 34 | 14 | 12 | 46 |
| Johan Oviedo | 2021-2025 | 29 | 38 | .433 | 4.91 | 104 | 98 | 0 | 0 | 0 | 562.1 | 568 | 307 | 65 | 290 | 430 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Juan Oviedo | 2015-2015 | 2 | 0 | 1.000 | 5.08 | 23 | 0 | 0 | 0 | 1 | 28.1 | 36 | 16 | 2 | 11 | 29 |
| Henry Owens | 2014-2015 | 2 | 2 | .500 | 6.34 | 9 | 8 | 0 | 0 | 0 | 44.0 | 49 | 31 | 6 | 23 | 32 |
| Tyler Owens | 2025-2025 | 4 | 0 | 1.000 | 2.55 | 8 | 0 | 0 | 0 | 1 | 17.2 | 16 | 5 | 1 | 8 | 13 |
| Ian Oxnevad | 2022-2022 | 4 | 11 | .267 | 5.87 | 41 | 17 | 0 | 0 | 15 | 115.0 | 144 | 75 | 18 | 41 | 75 |
