| 12/31/2014 | ||||||
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| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tom O'Halloran | 2012-2014 | 23 | 21 | .523 | 4.05 | 59 | 59 | 1 | 1 | 0 | 357.2 | 321 | 161 | 28 | 170 | 302 |
| Jim O'Neil | 2012-2014 | 6 | 7 | .462 | 2.44 | 105 | 0 | 0 | 0 | 8 | 96.0 | 55 | 26 | 7 | 23 | 89 |
| Carl O'Quinn | 2014-2014 | 1 | 0 | 1.000 | 0.82 | 2 | 2 | 0 | 0 | 0 | 11.0 | 8 | 1 | 0 | 4 | 10 |
| Dan O'Sullivan | 2012-2014 | 13 | 7 | .650 | 4.46 | 129 | 0 | 0 | 0 | 28 | 137.1 | 123 | 68 | 8 | 111 | 153 |
| Emory O'Toole | 2012-2014 | 9 | 2 | .818 | 2.72 | 139 | 0 | 0 | 0 | 7 | 142.1 | 106 | 43 | 15 | 70 | 170 |
| Francisco Ochoa | 2013-2014 | 8 | 4 | .667 | 3.74 | 70 | 11 | 0 | 0 | 2 | 122.2 | 117 | 51 | 15 | 42 | 107 |
| Pancho Ochoa | 2014-2014 | 0 | 0 | .000 | 1.93 | 12 | 0 | 0 | 0 | 0 | 14.0 | 8 | 3 | 1 | 9 | 7 |
| Troy Odom | 2012-2012 | 4 | 2 | .667 | 3.51 | 21 | 7 | 1 | 0 | 0 | 59.0 | 48 | 23 | 4 | 37 | 40 |
| Carlos Ojeda | 2013-2013 | 1 | 2 | .333 | 5.54 | 10 | 5 | 0 | 0 | 0 | 26.0 | 26 | 16 | 2 | 21 | 9 |
| Tsumemasa Okada | 2014-2014 | 0 | 0 | .000 | 2.45 | 7 | 0 | 0 | 0 | 0 | 3.2 | 2 | 1 | 1 | 3 | 2 |
| Carlos Olivares | 2013-2013 | 3 | 0 | 1.000 | 2.48 | 30 | 0 | 0 | 0 | 4 | 32.2 | 30 | 9 | 0 | 12 | 29 |
| Rick Oram | 2014-2014 | 0 | 1 | .000 | 16.20 | 7 | 0 | 0 | 0 | 0 | 3.1 | 11 | 6 | 0 | 4 | 1 |
| Ernesto Ortíz | 2014-2014 | 2 | 1 | .667 | 5.61 | 24 | 0 | 0 | 0 | 1 | 25.2 | 30 | 16 | 2 | 8 | 17 |
| José Ortíz | 2012-2014 | 4 | 5 | .444 | 5.60 | 12 | 9 | 0 | 0 | 0 | 54.2 | 76 | 34 | 10 | 27 | 30 |
| José Ortíz | 2012-2013 | 10 | 11 | .476 | 4.23 | 47 | 36 | 0 | 0 | 1 | 230.0 | 253 | 108 | 16 | 71 | 193 |
| Pedro Ortíz | 2012-2013 | 9 | 7 | .563 | 2.78 | 105 | 0 | 0 | 0 | 60 | 110.0 | 111 | 34 | 4 | 59 | 125 |
| Sergio Ortíz | 2014-2014 | 8 | 9 | .471 | 5.03 | 27 | 27 | 0 | 0 | 0 | 145.0 | 145 | 81 | 10 | 92 | 129 |
| Jake Osborne | 2012-2012 | 2 | 0 | 1.000 | 1.47 | 57 | 0 | 0 | 0 | 4 | 73.1 | 42 | 12 | 3 | 20 | 72 |
| Robert Osborne | 2014-2014 | 11 | 11 | .500 | 3.49 | 34 | 34 | 1 | 0 | 0 | 208.2 | 199 | 81 | 16 | 105 | 173 |
| Harold Osburn | 2013-2014 | 5 | 5 | .500 | 4.38 | 111 | 0 | 0 | 0 | 2 | 139.2 | 127 | 68 | 10 | 107 | 149 |
| Woody Owen | 2014-2014 | 4 | 7 | .364 | 5.67 | 16 | 16 | 0 | 0 | 0 | 85.2 | 106 | 54 | 6 | 55 | 59 |
| Jacob Owens | 2013-2014 | 4 | 1 | .800 | 7.20 | 44 | 0 | 0 | 0 | 0 | 50.0 | 51 | 40 | 9 | 41 | 62 |
| Keith Owens | 2013-2014 | 4 | 0 | 1.000 | 5.26 | 30 | 0 | 0 | 0 | 0 | 39.1 | 42 | 23 | 4 | 22 | 33 |
| Mike Owens | 2012-2012 | 0 | 1 | .000 | 2.33 | 25 | 0 | 0 | 0 | 2 | 27.0 | 39 | 7 | 1 | 11 | 18 |
| Tom Owens | 2012-2013 | 4 | 2 | .667 | 3.20 | 8 | 8 | 0 | 0 | 0 | 50.2 | 39 | 18 | 1 | 29 | 33 |
