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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chris O'Grady | 2016-2016 | 0 | 2 | .000 | 6.75 | 10 | 0 | 0 | 0 | 0 | 12.0 | 13 | 9 | 1 | 7 | 12 |
| Mike O'Reilly | 2018-2018 | 1 | 0 | 1.000 | 3.86 | 13 | 0 | 0 | 0 | 3 | 28.0 | 27 | 12 | 4 | 17 | 31 |
| Ryan O'Sullivan | 2014-2018 | 25 | 5 | .833 | 3.28 | 105 | 5 | 0 | 0 | 3 | 230.2 | 207 | 84 | 16 | 118 | 219 |
| Emilio Ogando | 2018-2020 | 15 | 4 | .789 | 5.42 | 87 | 16 | 0 | 0 | 5 | 217.2 | 245 | 131 | 48 | 98 | 206 |
| Steven Okert | 2015-2015 | 1 | 0 | 1.000 | 13.50 | 2 | 0 | 0 | 0 | 0 | 2.2 | 5 | 4 | 1 | 4 | 1 |
| Helcris Olivarez | 2022-2022 | 0 | 0 | .000 | 3.46 | 3 | 3 | 0 | 0 | 0 | 13.0 | 14 | 5 | 1 | 7 | 16 |
| Brian Olson | 2018-2021 | 0 | 0 | .000 | 11.32 | 8 | 0 | 0 | 0 | 0 | 10.1 | 11 | 13 | 3 | 9 | 5 |
| Tyler Olson | 2015-2017 | 6 | 12 | .333 | 6.80 | 43 | 26 | 0 | 0 | 1 | 143.0 | 164 | 108 | 15 | 90 | 133 |
| Braden Olthoff | 2023-2023 | 10 | 7 | .588 | 5.97 | 26 | 26 | 0 | 0 | 0 | 143.1 | 187 | 95 | 19 | 41 | 102 |
| Ben Onyshko | 2020-2023 | 2 | 2 | .500 | 3.04 | 21 | 2 | 0 | 0 | 2 | 23.2 | 19 | 8 | 3 | 13 | 30 |
| Oliver Ortega | 2023-2023 | 0 | 0 | .000 | 6.75 | 7 | 1 | 0 | 0 | 3 | 9.1 | 13 | 7 | 2 | 2 | 9 |
| Luis Ortiz | 2016-2022 | 12 | 11 | .522 | 4.24 | 52 | 34 | 0 | 0 | 0 | 220.2 | 234 | 104 | 29 | 74 | 185 |
| Josh Osich | 2013-2021 | 21 | 11 | .656 | 2.68 | 181 | 0 | 0 | 0 | 42 | 228.2 | 192 | 68 | 9 | 89 | 252 |
| Corey Oswalt | 2013-2015 | 4 | 16 | .200 | 8.33 | 51 | 36 | 0 | 0 | 0 | 175.0 | 263 | 162 | 27 | 107 | 118 |
| Michel Otanez | 2023-2023 | 0 | 0 | .000 | 6.59 | 10 | 0 | 0 | 0 | 1 | 13.2 | 13 | 10 | 1 | 14 | 19 |
| Andy Otero | 2021-2021 | 4 | 0 | 1.000 | 2.32 | 38 | 0 | 0 | 0 | 2 | 50.1 | 27 | 13 | 4 | 33 | 43 |
| Riley Ottesen | 2018-2020 | 5 | 10 | .333 | 6.37 | 24 | 22 | 0 | 0 | 0 | 111.2 | 148 | 79 | 12 | 53 | 76 |
| Connor Overton | 2018-2022 | 4 | 0 | 1.000 | 2.98 | 60 | 1 | 0 | 0 | 5 | 102.2 | 93 | 34 | 9 | 35 | 106 |
| Dillon Overton | 2015-2015 | 0 | 1 | .000 | 1.74 | 2 | 2 | 0 | 0 | 0 | 10.1 | 11 | 2 | 1 | 4 | 8 |
