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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 | 3 | 2 | 0 | 4.06 | 27 |
| Justin O'Conner | 2014-2014 | .287 | 12 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo O'Connor | 2022-2022 | .333 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Dowd | 2014-2014 | .361 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Grady | 2017-2018 | .253 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Malley | 2017-2017 | .222 | 2 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Rourke | 2014-2022 | .000 | 0 | 0 | 21 | 15 | 4 | 4.80 | 407 |
| Scott Oberg | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 1.23 | 13 |
| Matthew Oberste | 2016-2017 | .281 | 8 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Ocker | 2022-2022 | .000 | 0 | 0 | 2 | 0 | 0 | 1.06 | 17 |
| Mike Odenwaelder | 2017-2017 | .273 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Keshawn Ogans | 2023-2023 | .282 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Sarkis Ohanian | 2017-2019 | .000 | 0 | 0 | 2 | 1 | 0 | 2.35 | 33 |
| Dimas Ojeda | 2017-2020 | .218 | 9 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Okey | 2019-2023 | .276 | 15 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Olczak | 2018-2021 | .000 | 0 | 0 | 9 | 3 | 17 | 3.74 | 86 |
| Jared Oliva | 2020-2021 | .286 | 9 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Connor Oliver | 2014-2017 | .225 | 10 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Olloque | 2023-2023 | .283 | 5 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Alexis Olmeda | 2018-2018 | .295 | 9 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Olmos | 2013-2013 | .000 | 0 | 0 | 3 | 1 | 0 | 4.43 | 35 |
| Matt Olson | 2015-2015 | .319 | 17 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Olson | 2018-2019 | .000 | 0 | 0 | 7 | 15 | 0 | 7.95 | 136 |
| Tyler Olson | 2015-2015 | .000 | 0 | 0 | 1 | 3 | 0 | 6.75 | 28 |
| Austin Orewiler | 2019-2020 | .000 | 0 | 0 | 7 | 5 | 0 | 7.24 | 80 |
| Demi Orimoloye | 2019-2021 | .282 | 53 | 209 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ortega | 2014-2014 | .308 | 2 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jhailyn Ortiz | 2018-2020 | .287 | 51 | 179 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2016-2017 | .363 | 25 | 103 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ryan Ortiz | 2013-2013 | .258 | 7 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Drake Osborn | 2022-2023 | .199 | 4 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| J.D. Osborne | 2019-2021 | .247 | 8 | 58 | 0 | 0 | 0 | 36.00 | 1 |
| Jose Osuna | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Glenn Otto | 2018-2021 | .000 | 0 | 0 | 4 | 7 | 3 | 5.83 | 120 |
| Hunter Owen | 2019-2019 | .256 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Drake Owenby | 2019-2019 | .000 | 0 | 0 | 2 | 0 | 0 | 4.18 | 45 |
| Hagen Owenby | 2018-2019 | .234 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Owens | 2013-2014 | .000 | 0 | 0 | 15 | 8 | 0 | 3.65 | 200 |
