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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Colyn O'Connell | 2017-2017 | 4 | 5 | .444 | 5.37 | 15 | 14 | 0 | 0 | 0 | 62.0 | 65 | 37 | 8 | 34 | 41 |
| Chris O'Grady | 2016-2016 | 4 | 1 | .800 | 1.51 | 40 | 1 | 0 | 0 | 5 | 53.2 | 37 | 9 | 0 | 10 | 67 |
| Ryan O'Sullivan | 2015-2019 | 14 | 11 | .560 | 5.44 | 146 | 33 | 0 | 0 | 0 | 308.0 | 336 | 186 | 39 | 162 | 331 |
| Kenny Oakley | 2018-2018 | 1 | 1 | .500 | 1.42 | 3 | 0 | 0 | 0 | 0 | 6.1 | 2 | 1 | 1 | 4 | 8 |
| Trevor Oaks | 2016-2017 | 1 | 6 | .143 | 7.28 | 25 | 0 | 0 | 0 | 0 | 38.1 | 57 | 31 | 3 | 22 | 43 |
| Bailey Ober | 2019-2019 | 1 | 1 | .500 | 5.70 | 6 | 6 | 0 | 0 | 0 | 23.2 | 29 | 15 | 5 | 9 | 16 |
| Ryan Och | 2022-2022 | 1 | 1 | .500 | 13.03 | 10 | 0 | 0 | 0 | 2 | 9.2 | 14 | 14 | 4 | 11 | 9 |
| Nate Ocker | 2022-2023 | 1 | 6 | .143 | 5.61 | 48 | 0 | 0 | 0 | 7 | 61.0 | 68 | 38 | 14 | 30 | 60 |
| Emilio Ogando | 2017-2021 | 13 | 11 | .542 | 4.58 | 96 | 22 | 0 | 0 | 4 | 265.1 | 272 | 135 | 36 | 97 | 223 |
| Steven Okert | 2015-2015 | 4 | 2 | .667 | 3.48 | 45 | 1 | 0 | 0 | 2 | 44.0 | 51 | 17 | 4 | 28 | 50 |
| Wyatt Olds | 2023-2023 | 6 | 5 | .545 | 4.54 | 22 | 14 | 0 | 0 | 0 | 79.1 | 72 | 40 | 11 | 52 | 67 |
| Jared Oliver | 2019-2019 | 2 | 2 | .500 | 10.16 | 35 | 1 | 0 | 0 | 0 | 36.1 | 49 | 41 | 7 | 33 | 46 |
| Adam Oller | 2019-2021 | 22 | 17 | .564 | 5.72 | 76 | 44 | 0 | 0 | 0 | 274.0 | 280 | 174 | 38 | 133 | 192 |
| Edgar Olmos | 2017-2018 | 1 | 0 | 1.000 | 1.88 | 10 | 0 | 0 | 0 | 0 | 14.1 | 10 | 3 | 1 | 6 | 20 |
| Tyler Olson | 2015-2021 | 1 | 1 | .500 | 2.88 | 10 | 4 | 0 | 0 | 0 | 25.0 | 18 | 8 | 2 | 8 | 25 |
| Ben Onyshko | 2020-2022 | 3 | 2 | .600 | 3.67 | 32 | 7 | 0 | 0 | 9 | 68.2 | 61 | 28 | 6 | 32 | 67 |
| J.D. Orr | 2020-2022 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 1.2 | 2 | 0 | 0 | 7 | 2 |
| Braulio Ortiz | 2019-2019 | 1 | 2 | .333 | 2.16 | 16 | 0 | 0 | 0 | 3 | 16.2 | 10 | 4 | 3 | 6 | 15 |
| Luis Ortiz | 2017-2020 | 7 | 8 | .467 | 5.87 | 22 | 22 | 0 | 0 | 0 | 118.0 | 147 | 77 | 13 | 34 | 102 |
| Erik Ostberg | 2019-2019 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 4 | 0 | 1 | 3 | 0 |
| Ramon Osuna | 2019-2019 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 2 | 0 | 0 | 2 | 0 |
| Michel Otanez | 2023-2023 | 1 | 3 | .250 | 4.08 | 31 | 0 | 0 | 0 | 4 | 39.2 | 41 | 18 | 5 | 15 | 52 |
| Travis Ott | 2018-2018 | 2 | 0 | 1.000 | 3.63 | 3 | 3 | 0 | 0 | 0 | 17.1 | 15 | 7 | 4 | 6 | 15 |
| Riley Ottesen | 2018-2022 | 0 | 3 | .000 | 13.50 | 10 | 3 | 0 | 0 | 0 | 18.0 | 34 | 27 | 2 | 17 | 12 |
| Connor Overton | 2018-2021 | 11 | 4 | .733 | 4.38 | 88 | 5 | 0 | 0 | 1 | 150.0 | 151 | 73 | 12 | 68 | 147 |
| Henry Owens | 2019-2019 | 4 | 0 | 1.000 | 8.65 | 18 | 0 | 0 | 0 | 0 | 26.0 | 34 | 25 | 4 | 28 | 24 |
| Rudy Owens | 2013-2013 | 5 | 0 | 1.000 | 1.69 | 5 | 3 | 0 | 0 | 0 | 21.1 | 13 | 4 | 2 | 8 | 22 |
| Tyler Owens | 2023-2023 | 3 | 3 | .500 | 5.79 | 25 | 0 | 0 | 0 | 3 | 32.2 | 34 | 21 | 6 | 22 | 34 |
| Zachary Owings | 2020-2020 | 0 | 0 | .000 | 9.53 | 5 | 0 | 0 | 0 | 0 | 5.2 | 5 | 6 | 2 | 8 | 1 |
| Billy Oxford | 2019-2019 | 0 | 0 | .000 | 2.70 | 4 | 0 | 0 | 0 | 0 | 6.2 | 4 | 2 | 0 | 5 | 5 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
