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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 |
|---|---|---|---|---|---|---|---|---|---|
| Patrick O'Brien | 2017-2018 | .000 | 0 | 0 | 8 | 2 | 2 | 3.38 | 108 |
| Colin O'Connell | 2013-2013 | .000 | 0 | 0 | 0 | 0 | 0 | 40.50 | 0 |
| Justin O'Conner | 2013-2013 | .250 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Dowd | 2013-2013 | .385 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Grady | 2015-2015 | .342 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Connor O'Halloran | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 20.25 | 1 |
| Jack O'Loughlin | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 3 |
| Ryan O'Malley | 2017-2018 | .213 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Dylan O'Rae | 2023-2024 | .261 | 8 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Benjamin O'Shea | 2013-2015 | .000 | 0 | 0 | 2 | 3 | 0 | 8.71 | 83 |
| Trevor Oaks | 2015-2015 | .000 | 0 | 0 | 0 | 1 | 1 | 16.88 | 8 |
| Scott Oberg | 2013-2013 | .000 | 0 | 0 | 2 | 1 | 0 | 14.73 | 6 |
| Norberto Obeso | 2019-2019 | .318 | 9 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| David Oca | 2016-2017 | .000 | 0 | 0 | 2 | 8 | 0 | 6.60 | 93 |
| Nathaniel Ochoa Leyva | 2024-2024 | .200 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Ochsenbein | 2022-2023 | .000 | 0 | 0 | 3 | 0 | 1 | 3.68 | 8 |
| Nate Ocker | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 1 | 4.56 | 30 |
| Josh Ockimey | 2015-2017 | .277 | 16 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Odenwaelder | 2017-2017 | .227 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Odom | 2016-2016 | .167 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Ojeda | 2015-2015 | .226 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Wyatt Olds | 2022-2024 | .000 | 0 | 0 | 1 | 2 | 1 | 13.83 | 16 |
| Walker Olis | 2017-2017 | .224 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Russ Olive | 2021-2021 | .329 | 6 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Connor Oliver | 2016-2017 | .239 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Hunter Oliver | 2019-2021 | .306 | 19 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Christian Olivo | 2022-2024 | .242 | 15 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Alexis Olmeda | 2016-2016 | .259 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Mat Olsen | 2022-2024 | .000 | 0 | 0 | 1 | 4 | 1 | 6.38 | 36 |
| Tyler Olson | 2014-2015 | .000 | 0 | 0 | 6 | 1 | 1 | 6.59 | 55 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Casey Opitz | 2022-2024 | .266 | 15 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Ernny Ordonez | 2020-2021 | .296 | 14 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Orewiler | 2017-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 6.55 | 27 |
| Brennan Orf | 2024-2024 | .177 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Orlan | 2019-2019 | .188 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ornelas | 2023-2023 | .375 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Abimelec Ortiz | 2024-2024 | .333 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Capri Ortiz | 2024-2024 | .167 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2024-2024 | .250 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2016-2016 | .000 | 0 | 0 | 1 | 1 | 0 | 5.27 | 48 |
| Robinson Ortiz | 2024-2024 | .000 | 0 | 0 | 0 | 1 | 0 | 9.90 | 15 |
| Eric Orze | 2023-2023 | .000 | 0 | 0 | 1 | 1 | 0 | 7.71 | 7 |
| Michael Osinski | 2018-2018 | .168 | 7 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Osuna | 2024-2024 | .243 | 13 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osuna | 2013-2015 | .362 | 25 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Osuna | 2017-2018 | .214 | 9 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Dillon Overton | 2014-2014 | .000 | 0 | 0 | 3 | 1 | 0 | 4.22 | 36 |
| Andrew Owen | 2023-2024 | .000 | 0 | 0 | 4 | 3 | 0 | 6.45 | 103 |
| David Owen | 2017-2018 | .000 | 0 | 0 | 2 | 1 | 0 | 12.33 | 23 |
| Drake Owenby | 2016-2018 | .000 | 0 | 0 | 4 | 5 | 0 | 4.40 | 139 |
| Connor Owings | 2017-2018 | .278 | 6 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Avery Owusu-Asiedu | 2024-2024 | .147 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Oxford | 2018-2022 | .000 | 0 | 0 | 4 | 5 | 8 | 4.52 | 117 |
| Ian Oxnevad | 2016-2017 | .000 | 0 | 0 | 2 | 3 | 0 | 6.75 | 72 |
