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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 | 2017-2017 | 0 | 1 | .000 | 2.45 | 2 | 0 | 0 | 0 | 0 | 3.2 | 3 | 1 | 0 | 5 | 2 |
| Colyn O'Connell | 2018-2018 | 0 | 0 | .000 | 23.00 | 8 | 0 | 0 | 0 | 0 | 9.0 | 25 | 23 | 2 | 16 | 2 |
| Mike O'Reilly | 2019-2021 | 10 | 5 | .667 | 3.94 | 48 | 43 | 0 | 0 | 0 | 182.2 | 191 | 80 | 26 | 103 | 110 |
| David Oca | 2018-2018 | 1 | 4 | .200 | 10.38 | 10 | 10 | 0 | 0 | 0 | 39.0 | 64 | 45 | 9 | 44 | 22 |
| Nefi Ogando | 2018-2018 | 1 | 0 | 1.000 | 2.95 | 11 | 0 | 0 | 0 | 0 | 21.1 | 25 | 7 | 1 | 9 | 17 |
| Jared Oliver | 2019-2019 | 0 | 0 | .000 | 1.35 | 4 | 0 | 0 | 0 | 1 | 6.2 | 8 | 1 | 0 | 0 | 8 |
| Lester Oliveros | 2013-2015 | 10 | 14 | .417 | 3.62 | 145 | 0 | 0 | 0 | 65 | 149.1 | 117 | 60 | 16 | 84 | 196 |
| Reese Olson | 2022-2023 | 16 | 8 | .667 | 3.56 | 31 | 31 | 1 | 1 | 0 | 200.0 | 194 | 79 | 20 | 63 | 163 |
| Tyler Olson | 2017-2020 | 5 | 5 | .500 | 6.46 | 58 | 3 | 0 | 0 | 0 | 76.2 | 96 | 55 | 11 | 31 | 56 |
| Rodrigo Orozco | 2020-2020 | 0 | 0 | .000 | 7.71 | 3 | 0 | 0 | 0 | 0 | 4.2 | 3 | 4 | 0 | 9 | 1 |
| Braulio Ortiz | 2019-2019 | 1 | 0 | 1.000 | 3.38 | 6 | 0 | 0 | 0 | 0 | 10.2 | 8 | 4 | 1 | 8 | 4 |
| Joseph Ortiz | 2013-2014 | 3 | 1 | .750 | 2.28 | 48 | 0 | 0 | 0 | 17 | 47.1 | 42 | 12 | 2 | 21 | 66 |
| Josh Osich | 2020-2021 | 2 | 3 | .400 | 7.27 | 27 | 0 | 0 | 0 | 2 | 34.2 | 48 | 28 | 8 | 15 | 30 |
| Corey Oswalt | 2020-2023 | 2 | 5 | .286 | 5.59 | 25 | 17 | 0 | 0 | 0 | 96.2 | 117 | 60 | 16 | 41 | 61 |
| Andy Otero | 2022-2022 | 10 | 3 | .769 | 2.52 | 21 | 18 | 0 | 0 | 1 | 121.2 | 112 | 34 | 9 | 24 | 130 |
| Travis Ott | 2019-2020 | 7 | 9 | .438 | 9.42 | 93 | 1 | 0 | 0 | 4 | 107.0 | 149 | 112 | 20 | 88 | 75 |
| Connor Overton | 2021-2021 | 0 | 0 | .000 | 7.04 | 4 | 0 | 0 | 0 | 0 | 7.2 | 9 | 6 | 0 | 2 | 6 |
| Juan Oviedo | 2016-2016 | 5 | 2 | .714 | 4.32 | 45 | 0 | 0 | 0 | 1 | 50.0 | 58 | 24 | 9 | 20 | 40 |
| Rudy Owens | 2013-2015 | 2 | 1 | .667 | 3.58 | 8 | 4 | 0 | 0 | 0 | 27.2 | 38 | 11 | 5 | 5 | 22 |
