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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mike O'Boyle | 2012-2013 | 4 | 3 | .571 | 4.14 | 22 | 9 | 0 | 0 | 0 | 45.2 | 49 | 21 | 4 | 17 | 53 |
| Ben O'Halloran | 2014-2014 | 1 | 1 | .500 | 0.77 | 13 | 0 | 0 | 0 | 3 | 23.1 | 11 | 2 | 0 | 7 | 24 |
| Kyle O'Hare | 2016-2020 | 1 | 1 | .500 | 3.38 | 19 | 0 | 0 | 0 | 2 | 26.2 | 18 | 10 | 4 | 8 | 24 |
| Randy O'Laughlin | 2013-2016 | 1 | 1 | .500 | 4.96 | 13 | 1 | 0 | 0 | 5 | 16.1 | 15 | 9 | 0 | 13 | 13 |
| J.R. Oakley | 2013-2015 | 7 | 4 | .636 | 2.82 | 22 | 20 | 0 | 0 | 0 | 99.0 | 85 | 31 | 3 | 19 | 122 |
| Josh Oakman | 2017-2020 | 6 | 6 | .500 | 3.40 | 14 | 14 | 0 | 0 | 0 | 79.1 | 67 | 30 | 8 | 16 | 55 |
| Adam Obermeier | 2020-2020 | 0 | 1 | .000 | 9.82 | 8 | 0 | 0 | 0 | 0 | 14.2 | 12 | 16 | 3 | 19 | 13 |
| Antonio Ochoa | 2012-2015 | 1 | 2 | .333 | 3.00 | 19 | 0 | 0 | 0 | 2 | 24.0 | 17 | 8 | 1 | 15 | 29 |
| Marco Ochoa | 2021-2021 | 0 | 3 | .000 | 1.74 | 11 | 0 | 0 | 0 | 1 | 20.2 | 21 | 4 | 2 | 12 | 5 |
| Casey Odom | 2017-2021 | 8 | 3 | .727 | 2.83 | 29 | 0 | 0 | 0 | 2 | 60.1 | 53 | 19 | 5 | 27 | 67 |
| Jason Oehrlein | 2013-2019 | 0 | 0 | .000 | 1.44 | 33 | 0 | 0 | 0 | 0 | 31.1 | 19 | 5 | 2 | 13 | 30 |
| Danny Offen | 2017-2017 | 1 | 0 | 1.000 | 6.68 | 7 | 7 | 0 | 0 | 0 | 31.0 | 43 | 23 | 10 | 12 | 23 |
| Will Olejnik | 2020-2021 | 1 | 3 | .250 | 3.20 | 31 | 11 | 0 | 0 | 1 | 56.1 | 58 | 20 | 6 | 23 | 34 |
| Jon Olivares | 2013-2013 | 1 | 0 | 1.000 | 3.38 | 11 | 0 | 0 | 0 | 0 | 21.1 | 14 | 8 | 0 | 11 | 22 |
| Carlos Olivero | 2016-2016 | 2 | 1 | .667 | 7.71 | 13 | 4 | 0 | 0 | 0 | 23.1 | 24 | 20 | 2 | 30 | 13 |
| Mike Olsen | 2013-2014 | 5 | 4 | .556 | 3.66 | 12 | 11 | 0 | 0 | 0 | 66.1 | 69 | 27 | 11 | 17 | 44 |
| Nate Olshan | 2012-2012 | 0 | 1 | .000 | 0.50 | 12 | 0 | 0 | 0 | 1 | 18.0 | 9 | 1 | 0 | 4 | 15 |
| Oscar Orduno | 2019-2019 | 0 | 0 | .000 | 6.75 | 10 | 0 | 0 | 0 | 1 | 16.0 | 24 | 12 | 2 | 5 | 10 |
| Chris Oren | 2014-2016 | 7 | 2 | .778 | 2.57 | 34 | 10 | 0 | 0 | 8 | 94.2 | 88 | 27 | 5 | 32 | 92 |
| John Organista | 2015-2016 | 4 | 4 | .500 | 5.12 | 16 | 9 | 0 | 0 | 0 | 65.0 | 63 | 37 | 12 | 22 | 51 |
| Manny Ornelas | 2012-2015 | 7 | 7 | .500 | 3.54 | 48 | 20 | 0 | 0 | 0 | 119.1 | 109 | 47 | 10 | 54 | 107 |
| Jon Ortega | 2017-2017 | 1 | 0 | 1.000 | 13.70 | 14 | 0 | 0 | 0 | 1 | 23.0 | 43 | 35 | 7 | 30 | 16 |
| Jorge Ortega | 2015-2017 | 2 | 6 | .250 | 5.33 | 24 | 12 | 0 | 0 | 1 | 52.1 | 56 | 31 | 6 | 25 | 42 |
| Dan Ortiz | 2018-2019 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 2 | 0 | 0 | 2 | 2 |
| Manny Ortiz | 2013-2015 | 0 | 2 | .000 | 3.72 | 20 | 0 | 0 | 0 | 0 | 29.0 | 25 | 12 | 2 | 16 | 24 |
| Manny Ortiz | 2015-2015 | 3 | 0 | 1.000 | 1.72 | 16 | 0 | 0 | 0 | 0 | 31.1 | 24 | 6 | 2 | 12 | 26 |
| Ismael Oseguera | 2013-2013 | 0 | 0 | .000 | 2.45 | 14 | 0 | 0 | 0 | 0 | 18.1 | 17 | 5 | 0 | 6 | 18 |
| Steve Oswald | 2019-2019 | 0 | 0 | .000 | 1.42 | 6 | 0 | 0 | 0 | 0 | 6.1 | 2 | 1 | 0 | 2 | 6 |
