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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mikey O'Brien | 2016-2016 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 0 |
| Peter O'Brien | 2016-2021 | .289 | 156 | 441 | 0 | 0 | 0 | 0.00 | 0 |
| Riley O'Brien | 2021-2023 | .000 | 0 | 0 | 3 | 6 | 0 | 5.33 | 94 |
| Darren O'Day | 2013-2022 | .000 | 0 | 0 | 0 | 1 | 0 | 27.00 | 3 |
| Chris O'Dowd | 2018-2018 | .279 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Grady | 2020-2023 | .265 | 102 | 318 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Hearn | 2018-2023 | .277 | 78 | 254 | 0 | 0 | 0 | 0.00 | 0 |
| Shawn O'Malley | 2015-2015 | .341 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 2013-2017 | .302 | 14 | 191 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Reilly | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Ryan O'Rourke | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 0 | 5.59 | 11 |
| Trevor Oaks | 2018-2018 | .000 | 0 | 0 | 0 | 1 | 0 | 10.12 | 3 |
| Bailey Ober | 2022-2022 | .000 | 0 | 0 | 4 | 2 | 0 | 4.48 | 54 |
| Scott Oberg | 2016-2016 | .000 | 0 | 0 | 2 | 1 | 1 | 6.35 | 45 |
| Brett Oberholtzer | 2013-2013 | .000 | 0 | 0 | 1 | 0 | 0 | 1.04 | 15 |
| David Oca | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Ockimey | 2020-2020 | .297 | 21 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Rougned Odor | 2015-2020 | .337 | 36 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Alexi Ogando | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 2 |
| Edward Olivares | 2020-2023 | .257 | 23 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oliver | 2014-2015 | .000 | 0 | 0 | 19 | 25 | 1 | 5.46 | 335 |
| Hector Olivera | 2017-2019 | .329 | 57 | 212 | 0 | 0 | 0 | 0.00 | 0 |
| Lester Oliveros | 2013-2015 | .000 | 0 | 0 | 2 | 2 | 4 | 5.09 | 35 |
| Adam Oller | 2022-2023 | .000 | 0 | 0 | 8 | 17 | 0 | 5.64 | 177 |
| Alexis Olmeda | 2019-2019 | .167 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Olmos | 2016-2016 | .000 | 0 | 0 | 6 | 3 | 2 | 4.77 | 56 |
| Matt Olson | 2017-2017 | .324 | 12 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Reese Olson | 2022-2023 | .000 | 0 | 0 | 5 | 7 | 0 | 5.92 | 60 |
| Tyler Olson | 2018-2020 | .000 | 0 | 0 | 1 | 0 | 1 | 4.72 | 41 |
| Mike Olt | 2013-2015 | .268 | 17 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Logan Ondrusek | 2013-2016 | .000 | 0 | 0 | 11 | 6 | 7 | 3.10 | 171 |
| Shane Opitz | 2018-2018 | .200 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Orewiler | 2017-2017 | .000 | 0 | 0 | 2 | 0 | 0 | 5.94 | 5 |
| J.D. Orr | 2023-2023 | .233 | 0 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jorel Ortega | 2023-2023 | .256 | 4 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Braulio Ortiz | 2019-2019 | .000 | 0 | 0 | 1 | 0 | 0 | 10.12 | 4 |
| Danny Ortiz | 2016-2017 | .315 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2023-2023 | .000 | 0 | 0 | 5 | 4 | 0 | 3.62 | 58 |
| Ryan Ortiz | 2016-2016 | .274 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Osich | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 0 | 7.02 | 12 |
| Jose Osuna | 2016-2016 | .296 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Osuna | 2017-2018 | .000 | 0 | 0 | 0 | 1 | 5 | 3.38 | 10 |
| Andy Otero | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 3.00 | 5 |
| Dan Otero | 2013-2016 | .000 | 0 | 0 | 8 | 6 | 18 | 5.55 | 96 |
| Sharif Othman | 2017-2018 | .432 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Ottavino | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 18.00 | 3 |
| Glenn Otto | 2019-2023 | .000 | 0 | 0 | 12 | 10 | 8 | 3.84 | 232 |
| Connor Overton | 2023-2023 | .000 | 0 | 0 | 11 | 7 | 0 | 4.91 | 87 |
| Dillon Overton | 2016-2022 | .000 | 0 | 0 | 36 | 35 | 0 | 6.51 | 393 |
| Henry Owens | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 4.05 | 6 |
| Rudy Owens | 2013-2014 | .000 | 0 | 0 | 16 | 12 | 0 | 5.30 | 178 |
| Chris Owings | 2014-2023 | .287 | 43 | 192 | 0 | 0 | 0 | 0.00 | 0 |
| Marcell Ozuna | 2014-2016 | .298 | 31 | 100 | 0 | 0 | 0 | 0.00 | 0 |
