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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 |
|---|---|---|---|---|---|---|---|---|---|
| Peter O'Brien | 2013-2014 | .265 | 13 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Colyn O'Connell | 2017-2017 | .000 | 0 | 0 | 4 | 5 | 0 | 5.37 | 41 |
| Pablo O'Connor | 2020-2022 | .267 | 11 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Grady | 2016-2016 | .000 | 0 | 0 | 4 | 1 | 5 | 1.51 | 67 |
| Ryan O'Hearn | 2016-2017 | .239 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keefe | 2023-2023 | .308 | 6 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Sullivan | 2015-2019 | .000 | 0 | 0 | 14 | 11 | 0 | 5.44 | 331 |
| Kenny Oakley | 2018-2018 | .000 | 0 | 0 | 1 | 1 | 0 | 1.42 | 8 |
| Trevor Oaks | 2016-2017 | .000 | 0 | 0 | 1 | 6 | 0 | 7.28 | 43 |
| Bailey Ober | 2019-2019 | .000 | 0 | 0 | 1 | 1 | 0 | 5.70 | 16 |
| Matthew Oberste | 2014-2016 | .267 | 33 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Norberto Obeso | 2020-2020 | .268 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Och | 2022-2022 | .000 | 0 | 0 | 1 | 1 | 2 | 13.03 | 9 |
| Nate Ocker | 2022-2023 | .000 | 0 | 0 | 1 | 6 | 7 | 5.61 | 60 |
| Josh Ockimey | 2018-2018 | .321 | 31 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Emilio Ogando | 2017-2021 | .000 | 0 | 0 | 13 | 11 | 4 | 4.58 | 223 |
| Ryne Ogren | 2021-2023 | .253 | 12 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Okert | 2015-2015 | .000 | 0 | 0 | 4 | 2 | 2 | 3.48 | 50 |
| Wyatt Olds | 2023-2023 | .000 | 0 | 0 | 6 | 5 | 0 | 4.54 | 67 |
| Edward Olivares | 2019-2019 | .270 | 9 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Olivares | 2020-2023 | .260 | 15 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Oliver | 2019-2019 | .000 | 0 | 0 | 2 | 2 | 0 | 10.16 | 46 |
| Adam Oller | 2019-2021 | .000 | 0 | 0 | 22 | 17 | 0 | 5.72 | 192 |
| Manny Olloque | 2016-2019 | .279 | 4 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| David Olmedo-Barrera | 2017-2017 | .310 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Olmos | 2017-2018 | .000 | 0 | 0 | 1 | 0 | 0 | 1.88 | 20 |
| Brian Olson | 2018-2018 | .083 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Olson | 2014-2014 | .275 | 32 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Olson | 2015-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 2.88 | 25 |
| Mike Olt | 2017-2017 | .303 | 7 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ben Onyshko | 2020-2022 | .000 | 0 | 0 | 3 | 2 | 9 | 3.67 | 67 |
| Shane Opitz | 2013-2013 | .205 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Paulo Orlando | 2013-2013 | .316 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Orozco | 2020-2021 | .281 | 3 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| J.D. Orr | 2020-2022 | .204 | 6 | 30 | 0 | 0 | 0 | 0.00 | 2 |
| Irving Ortega | 2020-2020 | .288 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ortega | 2022-2023 | .235 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Braulio Ortiz | 2019-2019 | .000 | 0 | 0 | 1 | 2 | 3 | 2.16 | 15 |
| Luis Ortiz | 2017-2020 | .000 | 0 | 0 | 7 | 8 | 0 | 5.87 | 102 |
| Drake Osborn | 2022-2023 | .275 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| J.D. Osborne | 2023-2023 | .305 | 7 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Osik | 2021-2023 | .236 | 15 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Erik Ostberg | 2019-2019 | .286 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Osuna | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Michel Otanez | 2023-2023 | .000 | 0 | 0 | 1 | 3 | 4 | 4.08 | 52 |
| Sharif Othman | 2016-2019 | .252 | 14 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Travis Ott | 2018-2018 | .000 | 0 | 0 | 2 | 0 | 0 | 3.63 | 15 |
| Riley Ottesen | 2018-2022 | .000 | 0 | 0 | 0 | 3 | 0 | 13.50 | 12 |
| Connor Overton | 2018-2021 | .000 | 0 | 0 | 11 | 4 | 1 | 4.38 | 147 |
| Hunter Owen | 2018-2018 | .292 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Owens | 2019-2019 | .000 | 0 | 0 | 4 | 0 | 0 | 8.65 | 24 |
| Rudy Owens | 2013-2013 | .000 | 0 | 0 | 5 | 0 | 0 | 1.69 | 22 |
| Tyler Owens | 2023-2023 | .000 | 0 | 0 | 3 | 3 | 3 | 5.79 | 34 |
| Zachary Owings | 2020-2020 | .250 | 1 | 3 | 0 | 0 | 0 | 9.53 | 1 |
| Billy Oxford | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 5 |
| Marcell Ozuna | 2013-2013 | .149 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
