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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 | 2014-2016 | .000 | 0 | 0 | 14 | 13 | 0 | 5.05 | 166 |
| Peter O'Brien | 2020-2020 | .375 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Riley O'Brien | 2021-2025 | .000 | 0 | 0 | 22 | 16 | 7 | 3.99 | 274 |
| Justin O'Conner | 2014-2015 | .224 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Dowd | 2018-2018 | .292 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Grady | 2019-2024 | .251 | 50 | 137 | 0 | 0 | 0 | 0.00 | 0 |
| Logan O'Hoppe | 2022-2022 | .348 | 13 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keefe | 2020-2022 | .268 | 24 | 84 | 0 | 0 | 0 | 20.25 | 3 |
| Matt O'Neill | 2024-2024 | .224 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2017-2018 | .328 | 37 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Rourke | 2018-2019 | .000 | 0 | 0 | 9 | 5 | 2 | 4.23 | 126 |
| Scott Oberg | 2015-2017 | .000 | 0 | 0 | 10 | 4 | 3 | 4.26 | 131 |
| Aaron Ochsenbein | 2024-2025 | .000 | 0 | 0 | 7 | 4 | 4 | 4.06 | 114 |
| Josh Ockimey | 2019-2021 | .217 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Pierson Ohl | 2025-2025 | .000 | 0 | 0 | 13 | 10 | 0 | 7.57 | 76 |
| Chris Okey | 2019-2023 | .273 | 17 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Oliva | 2021-2025 | .281 | 13 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oliver | 2013-2013 | .000 | 0 | 0 | 6 | 2 | 0 | 4.70 | 95 |
| Alexis Olmeda | 2016-2019 | .265 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Olmstead | 2025-2025 | .338 | 10 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Olson | 2016-2016 | .266 | 20 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olt | 2017-2019 | .241 | 9 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ona | 2022-2022 | .214 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Orewiler | 2018-2018 | .000 | 0 | 0 | 1 | 1 | 1 | 5.04 | 16 |
| Demi Orimoloye | 2020-2020 | .279 | 17 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ornelas | 2023-2023 | .307 | 16 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Tirso Ornelas | 2024-2025 | .285 | 15 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Oliver Ortega | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 2 | 2.61 | 41 |
| Rafael Ortega | 2015-2019 | .281 | 13 | 121 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2021-2025 | .000 | 0 | 0 | 9 | 11 | 0 | 4.21 | 130 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Eric Orze | 2024-2025 | .000 | 0 | 0 | 7 | 7 | 14 | 6.88 | 82 |
| Alejandro Osuna | 2025-2025 | .305 | 20 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osuna | 2017-2021 | .337 | 22 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Ottavino | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 4.32 | 11 |
| Glenn Otto | 2019-2025 | .000 | 0 | 0 | 7 | 18 | 0 | 9.33 | 133 |
| Layonel Ovalles | 2025-2025 | .000 | 0 | 0 | 1 | 0 | 0 | 3.18 | 7 |
| Connor Overton | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 12.86 | 11 |
| Hunter Owen | 2020-2023 | .256 | 49 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Drake Owenby | 2019-2019 | .000 | 0 | 0 | 0 | 3 | 2 | 7.14 | 34 |
| Henry Owens | 2014-2014 | .000 | 0 | 0 | 5 | 4 | 0 | 4.15 | 74 |
| Chris Owings | 2021-2023 | .251 | 10 | 36 | 0 | 0 | 0 | 0.00 | 0 |
