| 12/31/2015 | ||||||
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| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Howard O'Brien | 2014-2015 | 5 | 2 | .714 | 3.90 | 48 | 0 | 0 | 0 | 24 | 57.2 | 49 | 25 | 8 | 31 | 72 |
| Ben O'Connor | 2012-2013 | 3 | 4 | .429 | 11.63 | 25 | 8 | 0 | 0 | 1 | 45.2 | 86 | 59 | 17 | 33 | 46 |
| Tom O'Day | 2012-2015 | 18 | 8 | .692 | 2.30 | 44 | 44 | 0 | 0 | 0 | 277.1 | 201 | 71 | 18 | 98 | 368 |
| Eric O'Farrell | 2012-2014 | 10 | 5 | .667 | 2.23 | 50 | 8 | 1 | 1 | 25 | 109.0 | 83 | 27 | 7 | 34 | 121 |
| Tom O'Farrell | 2012-2012 | 0 | 0 | .000 | 40.54 | 1 | 0 | 0 | 0 | 0 | 0.2 | 4 | 3 | 0 | 2 | 0 |
| Jack O'Herlihy | 2014-2015 | 9 | 6 | .600 | 4.43 | 20 | 20 | 0 | 0 | 0 | 103.2 | 99 | 51 | 5 | 55 | 116 |
| Tim O'Herlihy | 2012-2015 | 5 | 4 | .556 | 2.22 | 99 | 0 | 0 | 0 | 45 | 109.2 | 69 | 27 | 5 | 53 | 161 |
| Harlan O'Neal | 2012-2013 | 3 | 0 | 1.000 | 5.49 | 38 | 0 | 0 | 0 | 2 | 41.0 | 48 | 25 | 6 | 33 | 46 |
| Nick O'Neal | 2015-2015 | 0 | 1 | .000 | 6.27 | 17 | 0 | 0 | 0 | 1 | 18.2 | 26 | 13 | 4 | 12 | 15 |
| Clayton O'Neil | 2012-2015 | 9 | 6 | .600 | 3.54 | 48 | 25 | 0 | 0 | 14 | 165.1 | 127 | 65 | 11 | 61 | 213 |
| Mark O'Rourke | 2012-2013 | 3 | 3 | .500 | 7.29 | 50 | 0 | 0 | 0 | 0 | 54.1 | 70 | 44 | 10 | 48 | 45 |
| Pancho Ochoa | 2012-2013 | 3 | 1 | .750 | 2.30 | 29 | 0 | 0 | 0 | 0 | 31.1 | 17 | 8 | 3 | 13 | 53 |
| Bryant Oglethorpe | 2012-2013 | 4 | 5 | .444 | 6.46 | 47 | 6 | 0 | 0 | 1 | 69.2 | 78 | 50 | 3 | 49 | 92 |
| B.J. Oliver | 2014-2014 | 1 | 4 | .200 | 7.05 | 13 | 7 | 0 | 0 | 0 | 37.0 | 43 | 29 | 6 | 21 | 32 |
| Dan Oliver | 2014-2015 | 1 | 0 | 1.000 | 5.91 | 41 | 0 | 0 | 0 | 0 | 42.2 | 48 | 28 | 6 | 29 | 51 |
| Dexter Olson | 2015-2015 | 1 | 2 | .333 | 7.32 | 17 | 0 | 0 | 0 | 1 | 19.2 | 26 | 16 | 7 | 11 | 25 |
| Luis Olvera | 2015-2015 | 2 | 0 | 1.000 | 1.63 | 4 | 4 | 0 | 0 | 0 | 27.2 | 15 | 5 | 3 | 4 | 29 |
| Yasujiro Ono | 2012-2015 | 11 | 9 | .550 | 3.35 | 42 | 42 | 0 | 0 | 0 | 231.0 | 181 | 86 | 29 | 89 | 376 |
| Adrián Orozco | 2012-2014 | 14 | 8 | .636 | 3.40 | 26 | 26 | 0 | 0 | 0 | 167.0 | 163 | 63 | 16 | 50 | 182 |
| Alonso Ortega | 2014-2015 | 1 | 5 | .167 | 7.01 | 27 | 7 | 0 | 0 | 3 | 52.2 | 62 | 41 | 15 | 32 | 51 |
| Félix Ortíz | 2012-2015 | 19 | 9 | .679 | 3.10 | 39 | 39 | 2 | 2 | 0 | 258.2 | 252 | 89 | 6 | 60 | 301 |
| Jesús Ortíz | 2012-2015 | 15 | 7 | .682 | 3.25 | 51 | 29 | 0 | 0 | 8 | 185.1 | 159 | 67 | 14 | 64 | 206 |
| José Ortíz | 2014-2015 | 5 | 2 | .714 | 3.66 | 32 | 8 | 1 | 0 | 17 | 76.1 | 71 | 31 | 7 | 23 | 78 |
| Robert Osborne | 2012-2013 | 8 | 7 | .533 | 2.46 | 22 | 22 | 2 | 0 | 0 | 150.0 | 112 | 41 | 9 | 45 | 204 |
| Woody Owen | 2012-2013 | 4 | 8 | .333 | 5.04 | 21 | 21 | 0 | 0 | 0 | 119.2 | 112 | 67 | 20 | 56 | 166 |
