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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ethan O'Donnell | 2023-2023 | .350 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Connor O'Halloran | 2023-2023 | .000 | 0 | 0 | 3 | 1 | 0 | 6.30 | 9 |
| Logan O'Hoppe | 2020-2021 | .284 | 16 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keefe | 2017-2024 | .293 | 38 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Jack O'Loughlin | 2024-2024 | .000 | 0 | 0 | 2 | 1 | 0 | 5.51 | 19 |
| Matt O'Neill | 2022-2024 | .240 | 15 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Bailey Ober | 2020-2020 | .000 | 0 | 0 | 7 | 3 | 0 | 2.40 | 110 |
| Wilmer Oberto | 2016-2017 | .306 | 29 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Nehomar Ochoa Jr. | 2024-2024 | .185 | 6 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Ockimey | 2016-2017 | .260 | 6 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Wyatt Olds | 2023-2023 | .000 | 0 | 0 | 2 | 4 | 0 | 6.75 | 33 |
| Walker Olis | 2018-2019 | .271 | 11 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Olivares | 2023-2023 | .000 | 0 | 0 | 3 | 4 | 0 | 6.25 | 83 |
| Russ Olive | 2019-2020 | .235 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Olmstead | 2023-2023 | .288 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Olsen | 2022-2023 | .000 | 0 | 0 | 12 | 17 | 0 | 5.41 | 228 |
| J.B. Olson | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ona | 2019-2023 | .352 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Oquendo | 2015-2018 | .255 | 13 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Ernny Ordonez | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Brennan Orf | 2023-2023 | .224 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Orlan | 2015-2017 | .000 | 0 | 0 | 7 | 3 | 0 | 4.85 | 83 |
| Angel Ortega | 2013-2018 | .265 | 33 | 228 | 0 | 0 | 0 | 0.00 | 0 |
| Dennis Ortega | 2024-2024 | .300 | 14 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Ortega | 2020-2024 | .242 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Jorel Ortega | 2022-2022 | 1.000 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortega | 2017-2019 | .000 | 0 | 0 | 14 | 5 | 4 | 4.17 | 171 |
| Abimelec Ortiz | 2024-2024 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Ortiz | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 2 |
| Jhailyn Ortiz | 2023-2023 | .248 | 15 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Robinson Ortiz | 2020-2024 | .000 | 0 | 0 | 16 | 11 | 2 | 4.34 | 177 |
| Eric Orze | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 5 |
| Michael Osinski | 2019-2019 | .267 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Graham Osman | 2023-2023 | .000 | 0 | 0 | 2 | 0 | 0 | 1.12 | 13 |
| Erik Ostberg | 2019-2019 | .333 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Ota | 2022-2023 | .246 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Travis Ott | 2015-2021 | .000 | 0 | 0 | 8 | 18 | 2 | 5.67 | 215 |
| Layonel Ovalles | 2024-2024 | .000 | 0 | 0 | 1 | 0 | 2 | 3.09 | 11 |
| Johan Oviedo | 2019-2019 | .000 | 0 | 0 | 3 | 8 | 0 | 6.47 | 72 |
| Luis Oviedo | 2019-2023 | .000 | 0 | 0 | 8 | 15 | 0 | 6.47 | 145 |
| Hunter Owen | 2018-2018 | .260 | 11 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Owens | 2018-2018 | .000 | 0 | 0 | 2 | 2 | 0 | 3.63 | 52 |
| Ian Oxnevad | 2018-2020 | .000 | 0 | 0 | 6 | 12 | 1 | 5.18 | 149 |
