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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 |
|---|---|---|---|---|---|---|---|---|---|
| Logan O'Hoppe | 2020-2021 | .284 | 16 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keefe | 2017-2020 | .292 | 35 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Matt O'Neill | 2022-2023 | .212 | 8 | 27 | 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 |
| Josh Ockimey | 2016-2017 | .260 | 6 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Braeden Ogle | 2019-2023 | .000 | 0 | 0 | 13 | 13 | 7 | 4.42 | 194 |
| 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 |
| Russ Olive | 2019-2020 | .235 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Oller | 2019-2019 | .000 | 0 | 0 | 5 | 3 | 3 | 6.62 | 29 |
| 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 |
| Robert Orlan | 2015-2017 | .000 | 0 | 0 | 7 | 3 | 0 | 4.85 | 83 |
| Jio Orozco | 2021-2023 | .242 | 1 | 7 | 9 | 9 | 0 | 4.02 | 146 |
| Angel Ortega | 2013-2018 | .265 | 33 | 228 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Ortega | 2020-2022 | .233 | 5 | 17 | 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 |
| 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 |
| Robinson Ortiz | 2020-2023 | .000 | 0 | 0 | 14 | 9 | 1 | 3.89 | 148 |
| 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 |
| 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 |
| Johan Oviedo | 2019-2019 | .000 | 0 | 0 | 3 | 8 | 0 | 6.47 | 72 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| 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 |
