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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 | 2013-2014 | .000 | 0 | 0 | 4 | 6 | 0 | 5.07 | 77 |
| Peter O'Brien | 2013-2013 | .345 | 4 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Conner | 2015-2018 | .292 | 22 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo O'Connor | 2020-2020 | .266 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Grady | 2016-2016 | .223 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Hearn | 2015-2015 | .242 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Logan O'Hoppe | 2019-2019 | .321 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Neill | 2014-2017 | .244 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Benjamin O'Shea | 2016-2017 | .000 | 0 | 0 | 1 | 1 | 2 | 4.10 | 40 |
| Bailey Ober | 2018-2018 | .000 | 0 | 0 | 2 | 1 | 0 | 3.18 | 19 |
| Matthew Oberste | 2018-2018 | .107 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Wilmer Oberto | 2014-2015 | .239 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Omar Obregon | 2016-2016 | .192 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Och | 2022-2022 | .000 | 0 | 0 | 2 | 2 | 0 | 3.13 | 30 |
| Nate Ocker | 2020-2022 | .000 | 0 | 0 | 7 | 4 | 20 | 3.56 | 52 |
| Mike Odenwaelder | 2017-2018 | .267 | 11 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Rougned Odor | 2013-2013 | .209 | 5 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Emilio Ogando | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 7 |
| Ryne Ogren | 2021-2021 | .433 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Oh | 2014-2017 | .316 | 13 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Dimas Ojeda | 2019-2019 | .207 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Ojeda | 2017-2017 | .302 | 13 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Okey | 2018-2018 | .235 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Helcris Olivarez | 2021-2023 | .000 | 0 | 0 | 5 | 8 | 0 | 3.61 | 154 |
| Hunter Oliver | 2020-2020 | .308 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Oliver | 2018-2018 | .000 | 0 | 0 | 0 | 1 | 0 | 6.55 | 12 |
| Orlando Olivera | 2017-2017 | .325 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Olloque | 2016-2016 | .259 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| David Olmedo-Barrera | 2016-2017 | .188 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Olson | 2013-2014 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Mike Olt | 2018-2018 | .264 | 18 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Braden Olthoff | 2022-2022 | .000 | 0 | 0 | 4 | 2 | 0 | 2.65 | 62 |
| Ben Onyshko | 2020-2023 | .000 | 0 | 0 | 3 | 3 | 2 | 5.69 | 51 |
| Shane Opitz | 2019-2019 | .222 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Orewiler | 2019-2022 | .000 | 0 | 0 | 8 | 1 | 2 | 1.95 | 79 |
| Robert Orlan | 2019-2019 | .255 | 2 | 8 | 0 | 2 | 0 | 6.35 | 9 |
| Rodrigo Orozco | 2018-2019 | .247 | 13 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| J.D. Orr | 2021-2021 | .167 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Kaleb Ort | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Irving Ortega | 2017-2021 | .222 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Ortega | 2023-2023 | .279 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ortega | 2020-2021 | .246 | 2 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Braulio Ortiz | 2015-2018 | .000 | 0 | 0 | 14 | 6 | 6 | 3.60 | 284 |
| Channy Ortiz | 2022-2022 | .186 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Ortiz | 2013-2013 | .279 | 6 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Jhailyn Ortiz | 2020-2021 | .285 | 28 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Ortiz | 2020-2021 | .291 | 9 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2015-2015 | .000 | 0 | 0 | 4 | 1 | 0 | 3.66 | 50 |
| Sikes Orvis | 2016-2017 | .283 | 26 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Osik | 2020-2020 | .306 | 6 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Bryce Osmond | 2023-2023 | .000 | 0 | 0 | 1 | 5 | 0 | 5.53 | 80 |
| Erik Ostberg | 2021-2021 | .277 | 13 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Taylor Ostrich | 2016-2017 | .227 | 11 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osuna | 2013-2013 | .260 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Ota | 2021-2021 | .274 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Michel Otanez | 2022-2022 | .000 | 0 | 0 | 2 | 4 | 0 | 2.92 | 56 |
| James Outman | 2019-2019 | .250 | 8 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Alexander Ovalles | 2022-2022 | .216 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Ariel Ovando | 2013-2015 | .283 | 20 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Connor Overton | 2021-2021 | .000 | 0 | 0 | 1 | 1 | 1 | 2.42 | 15 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| David Owen | 2016-2019 | .000 | 0 | 0 | 9 | 1 | 4 | 4.37 | 100 |
| Noah Owen | 2022-2022 | .000 | 0 | 0 | 0 | 2 | 0 | 4.71 | 36 |
| Hagen Owenby | 2018-2021 | .295 | 8 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Owens | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 2.35 | 8 |
| Zachary Owings | 2020-2022 | .246 | 9 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Oxford | 2019-2022 | .000 | 0 | 0 | 0 | 2 | 0 | 1.98 | 44 |
