| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tom O'Halloran | 2012-2015 | 28 | 24 | .538 | 4.08 | 71 | 71 | 1 | 1 | 0 | 427.2 | 396 | 194 | 34 | 202 | 370 |
| 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 | 2014-2015 | 14 | 12 | .538 | 3.55 | 36 | 36 | 1 | 0 | 0 | 231.0 | 174 | 91 | 20 | 75 | 225 |
| 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 | 2012-2015 | 12 | 8 | .600 | 3.24 | 189 | 0 | 0 | 0 | 11 | 194.2 | 161 | 70 | 19 | 95 | 231 |
| Francisco Ochoa | 2013-2014 | 8 | 4 | .667 | 3.74 | 70 | 11 | 0 | 0 | 2 | 122.2 | 117 | 51 | 15 | 42 | 107 |
| Pancho Ochoa | 2014-2015 | 1 | 1 | .500 | 4.63 | 36 | 0 | 0 | 0 | 0 | 35.0 | 37 | 18 | 3 | 22 | 24 |
| 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 |
| Wesley Oliver | 2015-2015 | 1 | 1 | .500 | 5.49 | 20 | 0 | 0 | 0 | 3 | 19.2 | 26 | 12 | 1 | 8 | 25 |
| 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 | 2012-2015 | 4 | 5 | .444 | 5.53 | 13 | 9 | 0 | 0 | 0 | 55.1 | 77 | 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 | 2012-2015 | 9 | 7 | .563 | 2.83 | 112 | 0 | 0 | 0 | 60 | 120.2 | 121 | 38 | 5 | 61 | 136 |
| Sergio Ortíz | 2014-2015 | 17 | 16 | .515 | 5.05 | 54 | 54 | 0 | 0 | 0 | 285.1 | 281 | 160 | 21 | 187 | 260 |
| 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 | 2013-2015 | 8 | 6 | .571 | 4.42 | 126 | 0 | 0 | 0 | 3 | 156.2 | 143 | 77 | 12 | 116 | 168 |
| Woody Owen | 2014-2015 | 5 | 19 | .208 | 5.63 | 42 | 42 | 0 | 0 | 0 | 219.0 | 241 | 137 | 20 | 149 | 199 |
| Jacob Owens | 2013-2015 | 5 | 2 | .714 | 6.33 | 62 | 0 | 0 | 0 | 0 | 69.2 | 71 | 49 | 12 | 53 | 97 |
| Keith Owens | 2013-2015 | 4 | 0 | 1.000 | 5.15 | 66 | 0 | 0 | 0 | 0 | 78.2 | 83 | 45 | 8 | 44 | 72 |
| 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 |
| Shunso Oyama | 2015-2015 | 0 | 0 | .000 | 3.86 | 4 | 0 | 0 | 0 | 0 | 2.1 | 2 | 1 | 1 | 2 | 1 |
