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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Chris O'Brien | 2015-2016 | .288 | 12 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Patrick O'Brien | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 0 | 2.45 | 2 |
| Peter O'Brien | 2015-2018 | .302 | 83 | 258 | 0 | 0 | 0 | 0.00 | 0 |
| Colyn O'Connell | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 23.00 | 2 |
| Brian O'Keefe | 2023-2023 | .263 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Reilly | 2019-2021 | .000 | 0 | 0 | 10 | 5 | 0 | 3.94 | 110 |
| David Oca | 2018-2018 | .000 | 0 | 0 | 1 | 4 | 0 | 10.38 | 22 |
| Joe Odom | 2014-2022 | .250 | 36 | 161 | 0 | 0 | 0 | 0.00 | 0 |
| Nefi Ogando | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 0 | 2.95 | 17 |
| Edward Olivares | 2020-2020 | .313 | 9 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Olivares | 2022-2023 | .241 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Oliver | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 1.35 | 8 |
| Lester Oliveros | 2013-2015 | .000 | 0 | 0 | 10 | 14 | 65 | 3.62 | 196 |
| David Olmedo-Barrera | 2018-2019 | .314 | 24 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Olson | 2018-2021 | .218 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Reese Olson | 2022-2023 | .000 | 0 | 0 | 16 | 8 | 0 | 3.56 | 163 |
| Tyler Olson | 2017-2020 | .000 | 0 | 0 | 5 | 5 | 0 | 6.46 | 56 |
| Shane Opitz | 2018-2019 | .310 | 11 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Paulo Orlando | 2013-2015 | .348 | 21 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Orozco | 2020-2020 | .329 | 1 | 31 | 0 | 0 | 0 | 7.71 | 1 |
| J.D. Orr | 2022-2023 | .258 | 9 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Braulio Ortiz | 2019-2019 | .000 | 0 | 0 | 1 | 0 | 0 | 3.38 | 4 |
| Joseph Ortiz | 2013-2014 | .000 | 0 | 0 | 3 | 1 | 17 | 2.28 | 66 |
| Josh Osich | 2020-2021 | .000 | 0 | 0 | 2 | 3 | 2 | 7.27 | 30 |
| Ramon Osuna | 2019-2019 | .294 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Corey Oswalt | 2020-2023 | .000 | 0 | 0 | 2 | 5 | 0 | 5.59 | 61 |
| Andy Otero | 2022-2022 | .000 | 0 | 0 | 10 | 3 | 1 | 2.52 | 130 |
| Sharif Othman | 2014-2018 | .297 | 30 | 138 | 0 | 0 | 0 | 0.00 | 0 |
| Travis Ott | 2019-2020 | .000 | 0 | 0 | 7 | 9 | 4 | 9.42 | 75 |
| Connor Overton | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 7.04 | 6 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Oviedo | 2016-2016 | .000 | 0 | 0 | 5 | 2 | 1 | 4.32 | 40 |
| Rudy Owens | 2013-2015 | .000 | 0 | 0 | 2 | 1 | 0 | 3.58 | 22 |
