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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 | 2019-2019 | .000 | 0 | 0 | 1 | 1 | 0 | 6.60 | 25 |
| Colin O'Connell | 2016-2016 | .000 | 0 | 0 | 2 | 0 | 2 | 6.48 | 36 |
| Justin O'Conner | 2016-2017 | .266 | 37 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Grady | 2017-2020 | .000 | 0 | 0 | 16 | 15 | 0 | 5.16 | 187 |
| Ryan O'Hearn | 2017-2023 | .280 | 66 | 214 | 0 | 0 | 0 | 0.00 | 0 |
| Shawn O'Malley | 2013-2014 | .286 | 7 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Neill | 2017-2017 | .375 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Sullivan | 2014-2014 | .000 | 0 | 0 | 4 | 3 | 2 | 7.24 | 48 |
| Sean O'Sullivan | 2014-2018 | .000 | 0 | 0 | 16 | 10 | 3 | 6.23 | 198 |
| Trevor Oaks | 2017-2020 | .000 | 0 | 0 | 11 | 12 | 6 | 4.39 | 141 |
| Chad Oberacker | 2013-2017 | .282 | 48 | 213 | 0 | 0 | 0 | 0.00 | 0 |
| Brett Oberholtzer | 2019-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 3.63 | 11 |
| Omar Obregon | 2018-2018 | .313 | 4 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Ockimey | 2018-2019 | .298 | 20 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Odorizzi | 2013-2013 | .000 | 0 | 0 | 1 | 0 | 0 | 4.91 | 8 |
| Alexi Ogando | 2018-2019 | .000 | 0 | 0 | 7 | 3 | 2 | 5.36 | 69 |
| Braeden Ogle | 2019-2019 | .000 | 0 | 0 | 0 | 3 | 0 | 7.47 | 7 |
| Tyler Ogle | 2016-2016 | .255 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Ross Ohlendorf | 2014-2014 | .000 | 0 | 0 | 7 | 6 | 0 | 3.59 | 88 |
| Michael Ohlman | 2015-2017 | .351 | 5 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Okert | 2019-2021 | .000 | 0 | 0 | 7 | 7 | 7 | 4.77 | 127 |
| Walker Olis | 2020-2022 | .284 | 24 | 125 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oliver | 2013-2018 | .000 | 0 | 0 | 16 | 11 | 1 | 4.59 | 211 |
| Adam Oller | 2020-2020 | .000 | 0 | 0 | 2 | 10 | 0 | 9.55 | 37 |
| Manny Olloque | 2016-2022 | .247 | 18 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olt | 2013-2014 | .288 | 24 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Shane Opitz | 2015-2015 | .293 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Nathan Orf | 2017-2018 | .286 | 3 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Tirso Ornelas | 2022-2022 | .235 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Oropesa | 2015-2017 | .268 | 29 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jio Orozco | 2018-2018 | .000 | 0 | 0 | 4 | 5 | 0 | 7.05 | 37 |
| Angel Ortega | 2018-2019 | .282 | 10 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortega | 2019-2019 | .000 | 0 | 0 | 3 | 4 | 0 | 6.85 | 34 |
| Jose Ortega | 2013-2017 | .000 | 0 | 0 | 7 | 8 | 15 | 3.78 | 123 |
| Rafael Ortega | 2013-2017 | .304 | 8 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Channy Ortiz | 2023-2023 | .227 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Ortiz | 2014-2016 | .289 | 38 | 230 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2018-2019 | .000 | 0 | 0 | 13 | 15 | 0 | 6.59 | 178 |
| Josh Osich | 2019-2019 | .000 | 0 | 0 | 2 | 0 | 1 | 6.29 | 46 |
| Tyler Osik | 2023-2023 | .272 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Osinski | 2020-2022 | .244 | 18 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Osuna | 2015-2015 | .000 | 0 | 0 | 1 | 4 | 0 | 7.96 | 34 |
| Corey Oswalt | 2018-2018 | .000 | 0 | 0 | 5 | 3 | 0 | 4.05 | 68 |
| Dan Otero | 2013-2013 | .000 | 0 | 0 | 3 | 6 | 2 | 6.63 | 56 |
| Travis Ott | 2018-2018 | .000 | 0 | 0 | 3 | 2 | 0 | 3.45 | 43 |
| Adam Ottavino | 2014-2014 | .000 | 0 | 0 | 5 | 3 | 37 | 3.27 | 76 |
| James Outman | 2022-2022 | .247 | 18 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Alexander Ovalles | 2023-2023 | .216 | 7 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Dillon Overton | 2015-2020 | .000 | 0 | 0 | 14 | 15 | 0 | 6.53 | 160 |
| Luis Oviedo | 2021-2022 | .000 | 0 | 0 | 10 | 19 | 0 | 5.90 | 185 |
| Henry Owens | 2015-2017 | .000 | 0 | 0 | 12 | 11 | 0 | 4.02 | 253 |
| Ian Oxnevad | 2021-2021 | .000 | 0 | 0 | 9 | 10 | 0 | 5.77 | 90 |
