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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 | 2013-2015 | .307 | 14 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Grady | 2016-2016 | .000 | 0 | 0 | 0 | 2 | 0 | 6.75 | 12 |
| Ryan O'Hearn | 2016-2016 | .311 | 6 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Shawn O'Malley | 2015-2015 | .320 | 4 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Neill | 2018-2018 | .285 | 18 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Reilly | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 3 | 3.86 | 31 |
| Ryan O'Sullivan | 2014-2018 | .000 | 0 | 0 | 25 | 5 | 3 | 3.28 | 219 |
| Omar Obregon | 2017-2018 | .292 | 6 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Ockimey | 2019-2019 | .313 | 27 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Rougned Odor | 2014-2014 | .398 | 17 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Ryne Ogren | 2022-2022 | .371 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Ohlman | 2013-2013 | .242 | 7 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Okert | 2015-2015 | .000 | 0 | 0 | 1 | 0 | 0 | 13.50 | 1 |
| Edward Olivares | 2019-2019 | .321 | 7 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Olivares | 2020-2021 | .309 | 9 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Helcris Olivarez | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 3.46 | 16 |
| Orlando Olivera | 2017-2017 | .625 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| David Olmedo-Barrera | 2019-2021 | .273 | 17 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Olson | 2018-2021 | .286 | 30 | 170 | 0 | 0 | 0 | 11.32 | 5 |
| Tyler Olson | 2015-2017 | .000 | 0 | 0 | 6 | 12 | 1 | 6.80 | 133 |
| Mike Olt | 2019-2019 | .298 | 5 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Braden Olthoff | 2023-2024 | .000 | 0 | 0 | 17 | 15 | 0 | 6.03 | 208 |
| Ben Onyshko | 2020-2023 | .000 | 0 | 0 | 2 | 2 | 2 | 3.04 | 30 |
| Shane Opitz | 2013-2019 | .322 | 19 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ornelas | 2024-2024 | .369 | 10 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Tirso Ornelas | 2019-2023 | .273 | 12 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Orozco | 2021-2021 | .242 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ortega | 2022-2022 | .267 | 8 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Oliver Ortega | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 3 | 6.75 | 9 |
| Rafael Ortega | 2018-2019 | .294 | 7 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Joey Ortiz | 2020-2022 | .324 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2016-2022 | .000 | 0 | 0 | 12 | 11 | 0 | 4.24 | 185 |
| Josh Osich | 2013-2021 | .000 | 0 | 0 | 21 | 11 | 42 | 2.68 | 252 |
| Tyler Osik | 2020-2023 | .218 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Bryce Osmond | 2024-2024 | .000 | 0 | 0 | 6 | 8 | 4 | 4.47 | 92 |
| Michel Otanez | 2023-2024 | .000 | 0 | 0 | 2 | 1 | 2 | 4.13 | 41 |
| Andy Otero | 2021-2021 | .000 | 0 | 0 | 4 | 0 | 2 | 2.32 | 43 |
| Sharif Othman | 2014-2019 | .261 | 11 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Riley Ottesen | 2018-2020 | .000 | 0 | 0 | 5 | 10 | 0 | 6.37 | 76 |
| James Outman | 2021-2021 | .241 | 19 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Dillon Overton | 2015-2015 | .000 | 0 | 0 | 0 | 1 | 0 | 1.74 | 8 |
| Tyler Owens | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 4 |
| Zachary Owings | 2022-2022 | .500 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Fernery Ozuna | 2024-2024 | .000 | 0 | 0 | 4 | 1 | 2 | 3.51 | 29 |
