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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 | 2019-2021 | 9 | 6 | .600 | 3.96 | 28 | 24 | 0 | 0 | 1 | 143.1 | 145 | 63 | 17 | 65 | 134 |
| Chris O'Grady | 2020-2020 | 1 | 1 | .500 | 0.53 | 3 | 3 | 0 | 0 | 0 | 17.0 | 11 | 1 | 1 | 5 | 10 |
| Connor O'Halloran | 2025-2025 | 4 | 2 | .667 | 6.66 | 43 | 2 | 0 | 0 | 2 | 101.1 | 131 | 75 | 20 | 40 | 83 |
| Ryan O'Rourke | 2017-2022 | 4 | 4 | .500 | 4.70 | 87 | 0 | 0 | 0 | 1 | 122.2 | 122 | 64 | 14 | 62 | 101 |
| Sean O'Sullivan | 2013-2013 | 13 | 8 | .619 | 3.76 | 30 | 30 | 0 | 0 | 0 | 184.1 | 190 | 77 | 15 | 49 | 140 |
| Bailey Ober | 2021-2021 | 3 | 3 | .500 | 2.37 | 14 | 14 | 0 | 0 | 0 | 68.1 | 50 | 18 | 6 | 15 | 68 |
| Scott Oberg | 2014-2015 | 7 | 3 | .700 | 5.22 | 88 | 0 | 0 | 0 | 3 | 79.1 | 73 | 46 | 11 | 42 | 115 |
| Aaron Ochsenbein | 2020-2021 | 1 | 1 | .500 | 5.10 | 41 | 0 | 0 | 0 | 0 | 60.0 | 61 | 34 | 8 | 40 | 66 |
| Joe Odom | 2018-2020 | 0 | 0 | .000 | 10.80 | 1 | 0 | 0 | 0 | 0 | 1.2 | 5 | 2 | 0 | 0 | 1 |
| Sarkis Ohanian | 2016-2018 | 11 | 3 | .786 | 4.77 | 38 | 24 | 0 | 0 | 7 | 132.0 | 151 | 70 | 19 | 36 | 145 |
| Pierson Ohl | 2024-2024 | 14 | 4 | .778 | 3.91 | 28 | 28 | 0 | 0 | 0 | 172.2 | 180 | 75 | 23 | 23 | 147 |
| Jose Olivares | 2025-2025 | 6 | 0 | 1.000 | 6.02 | 23 | 0 | 0 | 0 | 3 | 52.1 | 60 | 35 | 8 | 31 | 50 |
| Jon Olsen | 2020-2024 | 12 | 10 | .545 | 4.74 | 83 | 15 | 0 | 0 | 3 | 214.1 | 260 | 113 | 23 | 93 | 134 |
| J.B. Olson | 2022-2022 | 1 | 2 | .333 | 15.75 | 11 | 0 | 0 | 0 | 0 | 8.0 | 18 | 14 | 4 | 10 | 3 |
| Austin Orewiler | 2022-2022 | 0 | 0 | .000 | 2.70 | 2 | 0 | 0 | 0 | 0 | 3.1 | 2 | 1 | 0 | 1 | 5 |
| Jorge Ortega | 2017-2019 | 5 | 2 | .714 | 3.61 | 26 | 7 | 1 | 0 | 2 | 72.1 | 74 | 29 | 9 | 17 | 54 |
| Joseph Ortiz | 2013-2013 | 0 | 0 | .000 | 0.96 | 9 | 0 | 0 | 0 | 4 | 9.1 | 5 | 1 | 0 | 1 | 10 |
| Luis Ortiz | 2016-2016 | 1 | 0 | 1.000 | 1.50 | 4 | 0 | 0 | 0 | 0 | 6.0 | 6 | 1 | 1 | 1 | 9 |
| Robinson Ortiz | 2020-2023 | 20 | 13 | .606 | 3.96 | 71 | 51 | 0 | 0 | 0 | 322.1 | 315 | 142 | 38 | 125 | 311 |
| Glenn Otto | 2018-2019 | 2 | 4 | .333 | 3.11 | 7 | 7 | 0 | 0 | 0 | 37.2 | 33 | 13 | 0 | 23 | 37 |
| Daniel Ouderkirk | 2025-2025 | 0 | 1 | .000 | 6.92 | 3 | 3 | 0 | 0 | 0 | 13.0 | 18 | 10 | 3 | 19 | 8 |
| Connor Overton | 2015-2025 | 1 | 2 | .333 | 8.45 | 15 | 7 | 0 | 0 | 0 | 38.1 | 56 | 36 | 8 | 22 | 35 |
| Dillon Overton | 2015-2016 | 1 | 7 | .125 | 5.70 | 18 | 18 | 1 | 0 | 0 | 90.0 | 96 | 57 | 12 | 30 | 96 |
| Johan Oviedo | 2020-2021 | 11 | 8 | .579 | 4.34 | 29 | 29 | 0 | 0 | 0 | 139.0 | 127 | 67 | 15 | 82 | 127 |
| Luis Oviedo | 2019-2025 | 12 | 17 | .414 | 5.05 | 57 | 52 | 0 | 0 | 0 | 280.0 | 286 | 157 | 32 | 164 | 241 |
| Hunter Owen | 2019-2022 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.0 | 1 | 0 | 0 | 0 | 0 |
| Drake Owenby | 2019-2019 | 2 | 1 | .667 | 3.86 | 4 | 4 | 0 | 0 | 0 | 21.0 | 23 | 9 | 4 | 4 | 28 |
| Hagen Owenby | 2019-2020 | 0 | 0 | .000 | 60.75 | 2 | 0 | 0 | 0 | 0 | 1.1 | 7 | 9 | 3 | 4 | 1 |
| Ian Oxnevad | 2019-2020 | 17 | 20 | .459 | 5.12 | 59 | 59 | 1 | 1 | 0 | 302.1 | 329 | 172 | 40 | 116 | 164 |
