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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Patrick O'Brien | 2023-2023 | 1 | 0 | 1.000 | 2.19 | 14 | 1 | 0 | 0 | 0 | 37.0 | 34 | 9 | 0 | 14 | 19 |
| Aaron O'Day | 2023-2023 | 2 | 0 | 1.000 | 3.26 | 6 | 0 | 0 | 0 | 0 | 19.1 | 18 | 7 | 1 | 2 | 14 |
| John O'Day | 2014-2015 | 5 | 2 | .714 | 6.01 | 13 | 13 | 0 | 0 | 0 | 70.1 | 79 | 47 | 7 | 41 | 53 |
| Clayton O'Neil | 2020-2020 | 2 | 1 | .667 | 6.50 | 17 | 0 | 0 | 0 | 2 | 18.0 | 17 | 13 | 1 | 23 | 12 |
| Bruce O'Slattery | 2019-2023 | 9 | 11 | .450 | 3.57 | 85 | 31 | 0 | 0 | 5 | 265.0 | 251 | 105 | 21 | 99 | 177 |
| Sean O'Sullivan | 2012-2012 | 5 | 1 | .833 | 3.63 | 16 | 10 | 1 | 1 | 0 | 74.1 | 75 | 30 | 5 | 21 | 62 |
| Brett Oberholtzer | 2013-2013 | 4 | 4 | .500 | 4.07 | 12 | 12 | 0 | 0 | 0 | 73.0 | 72 | 33 | 12 | 17 | 80 |
| Leonardo Ochoa | 2013-2013 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Jake Odorizzi | 2021-2022 | 3 | 1 | .750 | 2.73 | 11 | 2 | 0 | 0 | 0 | 33.0 | 28 | 10 | 3 | 4 | 31 |
| Jason Olbryc | 2020-2023 | 0 | 0 | .000 | 2.70 | 11 | 3 | 0 | 0 | 0 | 33.1 | 18 | 10 | 3 | 19 | 27 |
| Lester Oliveros | 2014-2014 | 3 | 0 | 1.000 | 4.94 | 39 | 0 | 0 | 0 | 2 | 23.2 | 20 | 13 | 1 | 11 | 23 |
| Jose Ortega | 2013-2020 | 1 | 0 | 1.000 | 6.43 | 8 | 0 | 0 | 0 | 3 | 7.0 | 8 | 5 | 0 | 4 | 8 |
| Lawrence OrtÃz | 2022-2023 | 3 | 3 | .500 | 5.71 | 42 | 0 | 0 | 0 | 0 | 64.2 | 78 | 41 | 6 | 27 | 51 |
| Andy Otero | 2015-2015 | 1 | 2 | .333 | 3.60 | 22 | 3 | 0 | 0 | 1 | 35.0 | 25 | 14 | 5 | 20 | 29 |
| Juan Carlos Oviedo | 2015-2015 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 0 | 6.2 | 3 | 0 | 0 | 1 | 1 |
