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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 |
|---|---|---|---|---|---|---|---|---|---|
| Riley O'Brien | 2019-2021 | .000 | 0 | 0 | 9 | 6 | 1 | 3.96 | 134 |
| Justin O'Conner | 2014-2014 | .205 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Dowd | 2015-2018 | .293 | 13 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Grady | 2018-2018 | .254 | 14 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Grady | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 0.53 | 10 |
| Logan O'Hoppe | 2022-2022 | .304 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Neill | 2015-2018 | .224 | 17 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2016-2016 | .241 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Rourke | 2017-2022 | .000 | 0 | 0 | 4 | 4 | 1 | 4.70 | 101 |
| Sean O'Sullivan | 2013-2013 | .000 | 0 | 0 | 13 | 8 | 0 | 3.76 | 140 |
| Bailey Ober | 2021-2021 | .000 | 0 | 0 | 3 | 3 | 0 | 2.37 | 68 |
| Scott Oberg | 2014-2015 | .000 | 0 | 0 | 7 | 3 | 3 | 5.22 | 115 |
| Aaron Ochsenbein | 2020-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 5.10 | 66 |
| Mike Odenwaelder | 2018-2018 | .364 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Odom | 2018-2020 | .296 | 17 | 61 | 0 | 0 | 0 | 10.80 | 1 |
| Braeden Ogle | 2019-2023 | .000 | 0 | 0 | 8 | 1 | 0 | 4.61 | 43 |
| Tyler Ogle | 2014-2015 | .303 | 24 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Sarkis Ohanian | 2016-2018 | .000 | 0 | 0 | 11 | 3 | 7 | 4.77 | 145 |
| Dimas Ojeda | 2018-2019 | .293 | 15 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Okey | 2020-2023 | .258 | 30 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Olczak | 2018-2018 | .000 | 0 | 0 | 2 | 1 | 0 | 9.72 | 32 |
| Walker Olis | 2019-2022 | .280 | 16 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Oliva | 2021-2022 | .315 | 4 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Alexis Olmeda | 2018-2018 | .232 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Olsen | 2020-2021 | .000 | 0 | 0 | 9 | 8 | 3 | 4.15 | 101 |
| J.B. Olson | 2022-2022 | .000 | 0 | 0 | 1 | 2 | 0 | 15.75 | 3 |
| Matt Olson | 2015-2015 | .224 | 8 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Olson | 2019-2023 | .000 | 0 | 0 | 15 | 13 | 0 | 4.00 | 181 |
| Jorge Ona | 2020-2020 | .333 | 11 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Oquendo | 2016-2017 | .271 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ernny Ordonez | 2023-2023 | .275 | 10 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Orewiler | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 5 |
| Demi Orimoloye | 2016-2023 | .279 | 57 | 205 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ornelas | 2021-2023 | .281 | 13 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Tirso Ornelas | 2019-2023 | .264 | 37 | 151 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Oropesa | 2013-2014 | .287 | 22 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Jio Orozco | 2019-2022 | .202 | 3 | 12 | 10 | 13 | 1 | 5.10 | 176 |
| Jake Ortega | 2020-2023 | .214 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortega | 2017-2019 | .000 | 0 | 0 | 5 | 2 | 2 | 3.61 | 54 |
| Channy Ortiz | 2022-2022 | .164 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jhailyn Ortiz | 2019-2022 | .271 | 40 | 109 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Ortiz | 2022-2022 | .321 | 7 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Ortiz | 2013-2013 | .000 | 0 | 0 | 0 | 0 | 4 | 0.96 | 10 |
| Luis Ortiz | 2016-2016 | .000 | 0 | 0 | 1 | 0 | 0 | 1.50 | 9 |
| Robinson Ortiz | 2020-2023 | .000 | 0 | 0 | 20 | 13 | 0 | 3.96 | 311 |
| Ryan Ortiz | 2013-2016 | .275 | 45 | 232 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Osinski | 2020-2021 | .260 | 13 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Erik Ostberg | 2022-2023 | .269 | 26 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osuna | 2015-2017 | .294 | 7 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Osuna | 2014-2014 | .000 | 0 | 0 | 4 | 4 | 0 | 6.14 | 98 |
| Corey Oswalt | 2017-2023 | .000 | 0 | 0 | 8 | 2 | 3 | 3.82 | 131 |
| Scott Ota | 2022-2023 | .259 | 15 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Glenn Otto | 2018-2019 | .000 | 0 | 0 | 2 | 4 | 0 | 3.11 | 37 |
| Dillon Overton | 2015-2016 | .000 | 0 | 0 | 1 | 7 | 0 | 5.70 | 96 |
| Johan Oviedo | 2020-2021 | .000 | 0 | 0 | 11 | 8 | 0 | 4.34 | 127 |
| Luis Oviedo | 2019-2023 | .000 | 0 | 0 | 10 | 13 | 0 | 5.01 | 164 |
| Hunter Owen | 2019-2022 | .262 | 31 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Drake Owenby | 2019-2019 | .000 | 0 | 0 | 2 | 1 | 0 | 3.86 | 28 |
| Hagen Owenby | 2019-2020 | .259 | 13 | 81 | 0 | 0 | 0 | 60.75 | 1 |
| Connor Owings | 2021-2021 | .223 | 5 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ian Oxnevad | 2019-2020 | .000 | 0 | 0 | 17 | 20 | 0 | 5.12 | 164 |
