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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mike O'Boyle | 2012-2013 | .000 | 0 | 0 | 4 | 3 | 0 | 4.14 | 53 |
| Eric O'Brian | 2012-2013 | .233 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Andy O'Brien | 2018-2019 | .311 | 5 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Conner | 2015-2018 | .207 | 15 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Arlen O'Doherty | 2012-2012 | .235 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Kurt O'Donnell | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Halloran | 2014-2014 | .000 | 0 | 0 | 1 | 1 | 3 | 0.77 | 24 |
| Kyle O'Hare | 2016-2016 | .000 | 0 | 0 | 1 | 0 | 0 | 3.94 | 10 |
| Randy O'Laughlin | 2013-2016 | .000 | 0 | 0 | 1 | 1 | 5 | 4.96 | 13 |
| J.R. Oakley | 2013-2015 | .000 | 0 | 0 | 7 | 4 | 0 | 2.82 | 122 |
| Josh Oakman | 2017-2017 | .000 | 0 | 0 | 4 | 3 | 0 | 4.05 | 28 |
| Jose Obregon | 2012-2012 | .244 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Ochoa | 2012-2015 | .000 | 0 | 0 | 1 | 2 | 2 | 3.00 | 29 |
| Jose Ochoa | 2017-2018 | .111 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ochoa | 2012-2012 | .208 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Casey Odom | 2017-2017 | .000 | 0 | 0 | 2 | 0 | 0 | 2.25 | 30 |
| Jason Oehrlein | 2013-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 1.44 | 30 |
| Tyler Oelkers | 2016-2019 | .209 | 6 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Offen | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 6.68 | 23 |
| John Oglesby | 2018-2019 | .300 | 9 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Olivares | 2013-2013 | .000 | 0 | 0 | 1 | 0 | 0 | 3.38 | 22 |
| Bobby Oliver | 2014-2015 | .250 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Oliveras | 2012-2012 | .277 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Olivero | 2016-2016 | .000 | 0 | 0 | 2 | 1 | 0 | 7.71 | 13 |
| Billy Oliveros | 2019-2019 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olsen | 2013-2014 | .000 | 0 | 0 | 5 | 4 | 0 | 3.66 | 44 |
| Nate Olshan | 2012-2012 | .000 | 0 | 0 | 0 | 1 | 1 | 0.50 | 15 |
| Brett Olson | 2017-2018 | .208 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Ord | 2018-2018 | .266 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Ordonez | 2013-2016 | .272 | 14 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Oscar Orduno | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 6.75 | 10 |
| Chris Oren | 2014-2016 | .000 | 0 | 0 | 7 | 2 | 8 | 2.57 | 92 |
| John Organista | 2015-2016 | .000 | 0 | 0 | 4 | 4 | 0 | 5.12 | 51 |
| Manny Ornelas | 2012-2015 | .000 | 0 | 0 | 7 | 7 | 0 | 3.54 | 107 |
| Gustavo Orozco | 2017-2018 | .283 | 11 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Leo Orozco | 2015-2016 | .292 | 20 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orr | 2019-2019 | .370 | 12 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Ortega | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 1 | 13.70 | 16 |
| Jorge Ortega | 2015-2017 | .000 | 0 | 0 | 2 | 6 | 1 | 5.33 | 42 |
| Juan Ortega | 2016-2016 | .202 | 7 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2012-2012 | .322 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Ortiz | 2018-2019 | .267 | 0 | 2 | 0 | 0 | 0 | 0.00 | 2 |
| Jordan Ortiz | 2016-2016 | .248 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 2015-2019 | .269 | 11 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 2012-2015 | .316 | 5 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Ortiz | 2013-2015 | .000 | 0 | 0 | 0 | 2 | 0 | 3.72 | 24 |
| Manny Ortiz | 2015-2015 | .000 | 0 | 0 | 3 | 0 | 0 | 1.72 | 26 |
| Tony Ortiz | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orzechowski | 2013-2013 | .147 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Oseguera | 2013-2013 | .000 | 0 | 0 | 0 | 0 | 0 | 2.45 | 18 |
| Hector Osorio | 2012-2012 | .301 | 2 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Oswald | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 1.42 | 6 |
| Clark Owens | 2016-2017 | .345 | 18 | 60 | 0 | 0 | 0 | 0.00 | 0 |
