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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Riley O'Brien | 2019-2019 | 2 | 0 | 1.000 | 1.10 | 3 | 3 | 0 | 0 | 0 | 16.1 | 15 | 2 | 0 | 5 | 6 |
| Jack O'Loughlin | 2019-2022 | 2 | 6 | .250 | 8.42 | 40 | 8 | 1 | 0 | 0 | 109.0 | 154 | 102 | 12 | 92 | 49 |
| Bailey Ober | 2019-2021 | 6 | 16 | .273 | 5.96 | 41 | 40 | 0 | 0 | 0 | 182.2 | 213 | 121 | 15 | 93 | 174 |
| Carlos Ocampo | 2020-2023 | 0 | 0 | .000 | 4.70 | 8 | 0 | 0 | 0 | 0 | 15.1 | 16 | 8 | 2 | 12 | 20 |
| Nathan Ocker | 2023-2023 | 2 | 2 | .500 | 6.88 | 32 | 0 | 0 | 0 | 1 | 35.1 | 46 | 27 | 3 | 11 | 28 |
| Josh Ockimey | 2020-2022 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Braeden Ogle | 2020-2022 | 5 | 3 | .625 | 4.27 | 40 | 5 | 0 | 0 | 15 | 59.0 | 55 | 28 | 4 | 32 | 69 |
| Pierson Ohl | 2023-2023 | 1 | 1 | .500 | 5.93 | 5 | 1 | 0 | 0 | 0 | 13.2 | 17 | 9 | 3 | 3 | 10 |
| Jon Olczak | 2019-2019 | 0 | 0 | .000 | 2.70 | 2 | 0 | 0 | 0 | 0 | 3.1 | 3 | 1 | 1 | 1 | 4 |
| Helcris Olivarez | 2021-2023 | 10 | 11 | .476 | 6.04 | 50 | 22 | 0 | 0 | 1 | 135.2 | 122 | 91 | 17 | 101 | 153 |
| Mat Olsen | 2022-2022 | 1 | 2 | .333 | 8.68 | 9 | 0 | 0 | 0 | 0 | 18.2 | 28 | 18 | 4 | 21 | 15 |
| Reese Olson | 2022-2023 | 2 | 2 | .500 | 3.67 | 14 | 2 | 0 | 0 | 0 | 34.1 | 31 | 14 | 4 | 14 | 34 |
| Braden Olthoff | 2022-2022 | 0 | 0 | .000 | 5.00 | 7 | 0 | 0 | 0 | 0 | 9.0 | 12 | 5 | 0 | 2 | 11 |
| Demi Orimoloye | 2020-2022 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Jonathan Ornelas | 2020-2023 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 1 | 0 | 0 | 0 | 0 |
| Jio Orozco | 2020-2022 | 3 | 4 | .429 | 4.90 | 21 | 14 | 0 | 0 | 0 | 75.1 | 86 | 41 | 11 | 20 | 97 |
| Oliver Ortega | 2023-2023 | 0 | 0 | .000 | 2.70 | 2 | 0 | 0 | 0 | 0 | 3.1 | 4 | 1 | 0 | 2 | 4 |
| Luis Ortiz | 2023-2023 | 0 | 0 | .000 | 7.71 | 7 | 0 | 0 | 0 | 0 | 11.2 | 15 | 10 | 2 | 5 | 16 |
| Robinson Ortiz | 2019-2023 | 22 | 13 | .629 | 5.47 | 118 | 44 | 0 | 0 | 0 | 331.0 | 375 | 201 | 29 | 124 | 370 |
| Eric Orze | 2022-2023 | 0 | 2 | .000 | 3.38 | 20 | 0 | 0 | 0 | 7 | 21.1 | 20 | 8 | 3 | 10 | 29 |
| Josh Osich | 2021-2021 | 0 | 0 | .000 | 3.48 | 5 | 0 | 0 | 0 | 0 | 10.1 | 10 | 4 | 1 | 2 | 14 |
| Michel Otanez | 2022-2022 | 1 | 7 | .125 | 5.93 | 32 | 0 | 0 | 0 | 6 | 44.0 | 47 | 29 | 4 | 29 | 54 |
| Glenn Otto | 2019-2021 | 2 | 4 | .333 | 6.00 | 10 | 10 | 0 | 0 | 0 | 45.0 | 56 | 30 | 2 | 19 | 31 |
| Johan Oviedo | 2019-2023 | 32 | 21 | .604 | 4.83 | 114 | 71 | 0 | 0 | 5 | 410.0 | 415 | 220 | 41 | 212 | 502 |
| Luis Oviedo | 2019-2023 | 11 | 11 | .500 | 3.94 | 79 | 19 | 0 | 0 | 18 | 192.0 | 153 | 84 | 16 | 98 | 242 |
| Jack Owen | 2023-2023 | 4 | 3 | .571 | 6.84 | 15 | 5 | 0 | 0 | 0 | 48.2 | 63 | 37 | 12 | 24 | 44 |
| Ian Oxnevad | 2020-2022 | 7 | 10 | .412 | 4.90 | 34 | 21 | 0 | 0 | 2 | 130.1 | 137 | 71 | 14 | 60 | 120 |
