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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 | 2019-2019 | 1 | 1 | .500 | 6.60 | 15 | 0 | 0 | 0 | 0 | 30.0 | 32 | 22 | 2 | 16 | 25 |
| Colin O'Connell | 2016-2016 | 2 | 0 | 1.000 | 6.48 | 23 | 0 | 0 | 0 | 2 | 41.2 | 50 | 30 | 6 | 35 | 36 |
| Chris O'Grady | 2017-2020 | 16 | 15 | .516 | 5.16 | 56 | 56 | 0 | 0 | 0 | 279.1 | 319 | 160 | 35 | 123 | 187 |
| Jack O'Loughlin | 2025-2025 | 5 | 10 | .333 | 7.22 | 19 | 19 | 0 | 0 | 0 | 91.0 | 129 | 73 | 18 | 54 | 54 |
| Ryan O'Sullivan | 2014-2014 | 4 | 3 | .571 | 7.24 | 58 | 0 | 0 | 0 | 2 | 68.1 | 79 | 55 | 7 | 41 | 48 |
| Sean O'Sullivan | 2014-2018 | 16 | 10 | .615 | 6.23 | 103 | 26 | 0 | 0 | 3 | 264.1 | 306 | 183 | 42 | 113 | 198 |
| Trevor Oaks | 2017-2020 | 11 | 12 | .478 | 4.39 | 73 | 26 | 0 | 0 | 6 | 213.0 | 248 | 104 | 24 | 64 | 141 |
| Brett Oberholtzer | 2019-2021 | 1 | 1 | .500 | 3.63 | 6 | 2 | 0 | 0 | 0 | 17.1 | 13 | 7 | 1 | 6 | 11 |
| Nate Ocker | 2024-2025 | 9 | 7 | .562 | 7.66 | 68 | 0 | 0 | 0 | 5 | 114.0 | 162 | 97 | 27 | 60 | 77 |
| Jake Odorizzi | 2013-2013 | 1 | 0 | 1.000 | 4.91 | 1 | 1 | 0 | 0 | 0 | 7.1 | 5 | 4 | 0 | 2 | 8 |
| Alexi Ogando | 2018-2019 | 7 | 3 | .700 | 5.36 | 62 | 0 | 0 | 0 | 2 | 102.1 | 95 | 61 | 16 | 68 | 69 |
| Ross Ohlendorf | 2014-2014 | 7 | 6 | .538 | 3.59 | 15 | 15 | 1 | 0 | 0 | 100.1 | 94 | 40 | 6 | 34 | 88 |
| Steven Okert | 2019-2021 | 7 | 7 | .500 | 4.77 | 113 | 0 | 0 | 0 | 7 | 134.0 | 130 | 71 | 32 | 48 | 127 |
| Andy Oliver | 2013-2018 | 16 | 11 | .593 | 4.59 | 61 | 35 | 0 | 0 | 1 | 225.1 | 213 | 115 | 24 | 141 | 211 |
| Emmett Olson | 2025-2025 | 8 | 10 | .444 | 6.75 | 29 | 29 | 0 | 0 | 0 | 150.2 | 161 | 113 | 27 | 84 | 142 |
| Jorge Ortega | 2019-2019 | 3 | 4 | .429 | 6.85 | 31 | 2 | 0 | 0 | 0 | 64.1 | 82 | 49 | 13 | 30 | 34 |
| Jose Ortega | 2013-2017 | 7 | 8 | .467 | 3.78 | 78 | 0 | 0 | 0 | 15 | 102.1 | 102 | 43 | 15 | 57 | 123 |
| Luis Ortiz | 2018-2019 | 13 | 15 | .464 | 6.59 | 59 | 59 | 0 | 0 | 0 | 289.1 | 373 | 212 | 45 | 129 | 178 |
| Josh Osich | 2019-2019 | 2 | 0 | 1.000 | 6.29 | 47 | 0 | 0 | 0 | 1 | 58.2 | 75 | 41 | 10 | 30 | 46 |
| Dan Otero | 2013-2013 | 3 | 6 | .333 | 6.63 | 49 | 2 | 0 | 0 | 2 | 58.1 | 83 | 43 | 9 | 29 | 56 |
| Travis Ott | 2018-2018 | 3 | 2 | .600 | 3.45 | 9 | 9 | 0 | 0 | 0 | 57.1 | 52 | 22 | 0 | 30 | 43 |
| Connor Overton | 2018-2024 | 3 | 1 | .750 | 4.50 | 23 | 3 | 0 | 0 | 0 | 50.0 | 60 | 25 | 8 | 18 | 52 |
| Dillon Overton | 2015-2020 | 14 | 15 | .483 | 6.53 | 52 | 52 | 0 | 0 | 0 | 255.0 | 332 | 185 | 42 | 117 | 160 |
| Luis Oviedo | 2021-2025 | 10 | 19 | .345 | 6.12 | 54 | 50 | 0 | 0 | 0 | 238.1 | 253 | 162 | 40 | 184 | 202 |
| Henry Owens | 2015-2017 | 12 | 11 | .522 | 4.02 | 52 | 45 | 0 | 0 | 0 | 241.2 | 219 | 108 | 21 | 116 | 253 |
| Tyler Owens | 2025-2025 | 0 | 1 | .000 | 4.37 | 16 | 0 | 0 | 0 | 3 | 22.2 | 26 | 11 | 3 | 11 | 13 |
| Ian Oxnevad | 2021-2021 | 9 | 10 | .474 | 5.77 | 28 | 28 | 0 | 0 | 0 | 156.0 | 173 | 100 | 24 | 58 | 90 |
| Fernery Ozuna | 2024-2025 | 5 | 5 | .500 | 6.96 | 59 | 0 | 0 | 0 | 1 | 94.1 | 118 | 73 | 11 | 60 | 96 |
