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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 |
|---|---|---|---|---|---|---|---|---|---|
| Eric O'Brian | 2012-2012 | .257 | 7 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Marc O'Brian | 2016-2017 | .000 | 0 | 0 | 6 | 4 | 0 | 4.61 | 115 |
| David O'Conner | 2015-2015 | .222 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Conner | 2021-2021 | .000 | 0 | 0 | 1 | 2 | 0 | 5.64 | 28 |
| Kurt O'Donnell | 2012-2012 | .250 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Larry O'Donnell | 2016-2016 | .692 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Hare | 2014-2015 | .237 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Oakman | 2017-2017 | .250 | 0 | 3 | 2 | 1 | 0 | 3.69 | 58 |
| Adam Obermeier | 2019-2019 | .000 | 0 | 0 | 0 | 3 | 0 | 5.04 | 61 |
| Alex Ochoa | 2020-2020 | .376 | 10 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Oelkers | 2016-2016 | .300 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ojeda | 2014-2014 | .231 | 17 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Will Olejnik | 2020-2020 | .000 | 0 | 0 | 2 | 2 | 7 | 5.27 | 26 |
| Jimmy Olivares | 2020-2020 | .303 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Olivares | 2018-2019 | .000 | 0 | 0 | 2 | 1 | 0 | 3.40 | 47 |
| Bobby Oliver | 2014-2014 | .257 | 9 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Olivera | 2020-2020 | .000 | 0 | 0 | 4 | 2 | 0 | 6.13 | 44 |
| Billy Oliveros | 2019-2019 | .228 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Olmsted | 2015-2015 | .308 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Brett Olson | 2016-2017 | .270 | 20 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Olson | 2020-2021 | .000 | 0 | 0 | 1 | 7 | 0 | 7.32 | 63 |
| Bruce Oney | 2020-2020 | .000 | 0 | 0 | 2 | 3 | 0 | 9.19 | 32 |
| Jim Ord | 2018-2018 | .307 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Gustavo Orozco | 2017-2017 | .281 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Leo Orozco | 2015-2015 | .418 | 31 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Orr | 2015-2015 | .254 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| David Orr | 2018-2019 | .350 | 12 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orr | 2018-2018 | .400 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Ortiz | 2013-2014 | .321 | 11 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Ortiz | 2018-2018 | .323 | 7 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Dan Ortiz | 2017-2018 | .000 | 0 | 0 | 3 | 1 | 0 | 8.36 | 41 |
| Jorge Ortiz | 2013-2014 | .277 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Ovens | 2020-2020 | .000 | 0 | 0 | 3 | 0 | 0 | 4.56 | 19 |
| Mike Overstreet | 2020-2021 | .000 | 0 | 0 | 3 | 1 | 4 | 4.00 | 37 |
| Mason Owenby | 2015-2016 | .000 | 0 | 0 | 6 | 2 | 4 | 3.64 | 32 |
| Chris Owens | 2015-2016 | .000 | 0 | 0 | 4 | 3 | 2 | 5.04 | 63 |
| Clark Owens | 2016-2016 | .426 | 21 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| D.J. Owens | 2013-2013 | .177 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Owens | 2020-2020 | .571 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
